January 2020 - Ffmpeg-devel-irc

ffmpeg-devel.log.20200120
by burek 21 Jan '20

21 Jan '20

[00:00:00 CET] --- Mon Jan 20 2020

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ffmpeg.log.20200120
by burek 21 Jan '20

21 Jan '20

[05:24:02 CET] <BeerLover> What does this error mean? https://0x0.st/zFGL.bin [06:39:57 CET] <BeerLover> I am trying to convert mp3 into HLS segments and am getting this error: https://0x0.st/zFDq.txt [06:40:34 CET] <BeerLover> Too long service or provider name. Could not write header for output file #0 (incorrect codec parameters ?): Cannot allocate memory [06:43:08 CET] <furq> BeerLover: -metadata service_name= [06:43:27 CET] <furq> otherwise it'll copy the title from the input, which breaks if it's >254 bytes [06:43:45 CET] <BeerLover> furq: okay, so any string is okay? [06:43:49 CET] <furq> yeah [06:44:00 CET] <furq> leaving it blank should work as well but if not just any string [06:45:00 CET] <BeerLover> blank doesn't work [06:45:20 CET] <BeerLover> -metadata service_name='' [06:47:59 CET] <BeerLover> furq: will this override title? [07:41:20 CET] <void09> anyone here that can help me try to figure out why ffmpeg cuts a video with 1 frame difference given the same -to time , but different -ss time ? [07:41:20 CET] <void09> 1 frame difference at the end, of course [11:10:26 CET] <void09> hello [12:13:05 CET] <pagios> hello community, i am looking for a book/resource to start learning about the basic of video/audio. Something that gives solid base about pixels, colors, codecs, containers etc for me to really understand how to use the framework parameters, do you recommend any? Thank you [12:16:43 CET] <void09> pagios: https://github.com/leandromoreira/digital_video_introduction ? [12:17:41 CET] <pagios> void09, thanks so much [12:17:42 CET] <pink_mist> pagios: I've no idea about a book, but going through the ffmpeg wiki would be a great start https://trac.ffmpeg.org/ [14:56:54 CET] <LFSVeteran> little bit further...https://pastebin.com/1n0DYwqw [14:56:59 CET] <LFSVeteran> fails with : [14:57:00 CET] <LFSVeteran> [wav @ 0x4dc940] No streams to mux were specified [14:57:00 CET] <LFSVeteran> Could not write output file header (error 'Invalid argument') [17:56:22 CET] <cousin_luigi> Greetings. [17:56:52 CET] <cousin_luigi> Can I change the aspect ratio of a video stream without reencoding it? I think I solved it once, but I can't remember how. [17:59:09 CET] <furq> cousin_luigi: -c copy -aspect 16:9 [17:59:35 CET] <furq> assuming the container supports it and your player respects container-level aspect ratio metadata [18:02:02 CET] <DHE> there might be faster tools that are container-specific, like mkv tools, that can do the change in place. ffmpeg will have to rebuild the file to do this. [18:02:48 CET] <furq> there are bitstream filters that do it on the stream level as well [18:02:52 CET] <furq> but that's codec-specific [18:30:40 CET] <cousin_luigi> furq: Thanks, done. [18:30:51 CET] <cousin_luigi> DHE: Uhm, mkv you say? [18:31:03 CET] <cousin_luigi> DHE: Like mkvtoolnix? [18:32:18 CET] <DHE> it's been a long time since I've used it... [18:33:50 CET] <cousin_luigi> anyway the thing is done. bbl [18:59:26 CET] <donmerendolo> Hello, I want to remove a fragment of a 12 hour long h264 video. I have tried splitting it into two parts and then concatenate them, but it doesn't let me split them (says Invalid NAL unit 0, skipping and error while decoding MB 4 2, bytestream -55). I don't want to re-encode them as that would mean losing quality, what can I do? [19:02:32 CET] <donmerendolo> It would be better if I could remove the fragment directly, but I don't understand what i found in google [19:05:49 CET] <nicolas17> how did you split it? [19:06:50 CET] <donmerendolo> with ffmpeg -i illo.mp4 -ss 00:00:00 -t 07:45:45 parte1.mp4 [19:08:16 CET] <nicolas17> that's re-encoding [19:08:23 CET] <donmerendolo> oh [19:08:33 CET] <donmerendolo> how would i not re-encode? [19:08:38 CET] <nicolas17> you need "-codec copy" to tell it not to [19:10:02 CET] <donmerendolo> thank you [19:11:21 CET] <donmerendolo> now it says frame= 0 fps=0.0 q=-1.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x on the second part [19:11:26 CET] <donmerendolo> the first one is working [22:59:36 CET] <BabySoda_> hello? [23:35:01 CET] <SirNapkin1334> despite having been installed via apt-get, attempting to run `ffmpeg` gives: `-bash: /usr/local/bin/ffmpeg: No such file or directory` [23:35:42 CET] <SirNapkin1334> does anyone know how to fix this? [23:36:09 CET] <SirNapkin1334> hmm...running /usr/bin/ffmpeg works, but how do I make `ffmpeg` point to `/usr/bin/ffmpeg` [23:36:52 CET] <SirNapkin1334> also, the ffmpeg in the apt-get repository is outdated, as apt-get reports it's the newest version - 3.4.6 [23:37:00 CET] <SirNapkin1334> how can I update ffmpeg? [23:52:31 CET] <taliho> you could run in docker if you don't want to recompile [23:52:40 CET] <taliho> https://hub.docker.com/r/jrottenberg/ffmpeg/ [00:00:00 CET] --- Tue Jan 21 2020

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ffmpeg-devel.log.20200119
by burek 20 Jan '20

20 Jan '20

[00:00:00 CET] --- Sun Jan 19 2020

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ffmpeg.log.20200119
by burek 20 Jan '20

20 Jan '20

[01:00:41 CET] <imstig> Hey all -- trying to compile ffmpeg on an ubuntu 18.04 machine. I'm running into issues with pkg-config not finding "opus" [01:00:55 CET] <imstig> although, when I do pkg-config --list-all it is included in there and installed [01:01:00 CET] <imstig> any ideas? [01:12:36 CET] <BtbN> It's probably too old? [01:36:20 CET] <imstig> BtBN: what is too old? [01:36:31 CET] <imstig> opus exists and is in the path [01:37:01 CET] <BtbN> Yes, but it can still be too old [01:37:08 CET] <BtbN> 18.04 is quite dated at this point [09:17:38 CET] <void09> anyone here that can help me try to figure out why ffmpeg cuts a video with 1 frame difference given the same -to time , but different -ss time ? [09:17:49 CET] <void09> 1 frame difference at the end, of course [10:34:22 CET] <TheAMM> Something something frames having durations? [18:45:46 CET] <KingBoomer> how can i create a single gif from several other gifs? [19:21:48 CET] <nicolas17> KingBoomer: you mean playing one after the other? [19:25:10 CET] <KingBoomer> nicolas17: simultaneously [19:25:29 CET] <KingBoomer> e.g say i have 4 component gifs, gif-1, gif-2, gif-3, gif-4 [19:25:33 CET] <nicolas17> one on top of the other, or tiles, that kind of thing? [19:26:07 CET] <KingBoomer> nicolas17: tiles [19:26:16 CET] <KingBoomer> i think that's the correct term [19:26:26 CET] <nicolas17> see the hstack, vstack, and overlay video filters [19:28:42 CET] <KingBoomer> thanks, i'll take a look [19:32:28 CET] <cehoyos> There is also xstack specifally for 2x2 and similar layouts [19:32:39 CET] <nicolas17> cehoyos: I didn't know that, cool! [19:33:06 CET] <nicolas17> I thought you'd have to pipe two vstack into an hstack or viceversa, or use overlay [19:33:21 CET] <nicolas17> xstack looks much simpler [19:40:58 CET] <KingBoomer> how is xstack different from hstack? [19:41:19 CET] <KingBoomer> xstack is only for a 2x2 grid? [19:41:42 CET] <KingBoomer> well, an n by n grid [19:41:50 CET] <KingBoomer> oh no [19:42:11 CET] <nicolas17> hstack is only horizontal, vstack is only vertical, xstack is a grid [19:42:32 CET] <KingBoomer> nicolas17: xstack seems to be whatever rectangular layout you want, no? [19:43:15 CET] <durandal_1707> KingBoomer: read wiki, there is entry about it [19:43:24 CET] <KingBoomer> ok thanks [19:43:47 CET] <nicolas17> https://trac.ffmpeg.org/wiki/Create%20a%20mosaic%20out%20of%20several%20inp… [19:43:52 CET] <KingBoomer> also, say i want to create a gif that plays a single frame for n seconds, and then another frame for b seconds, is this possible? [19:46:02 CET] <KingBoomer> obviously i could just give ffmpeg the same frame n times, but that seems inefficient [19:47:07 CET] <BtbN> Easily possible, but MUCH more efficient to do with a dedicated gif editor [19:47:20 CET] <BtbN> Cause there you can just set the duration of each picture [19:47:24 CET] <nicolas17> you'd need to craft a VFR video stream, right? [19:47:29 CET] <KingBoomer> BtbN: it needs to be programmatic [19:47:56 CET] <BtbN> I'm sure there's libraries dedicated to generating gif [19:48:20 CET] <KingBoomer> ffmpeg seems way quicker than anything else i've tried [19:48:40 CET] <BtbN> ffmpeg can generate gifs, but since gif does not really fit on the concept of video in the classic sense, so there are some oddities [00:00:00 CET] --- Mon Jan 20 2020

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ffmpeg-devel.log.20200118
by burek 19 Jan '20

19 Jan '20

[00:00:00 CET] --- Sat Jan 18 2020

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ffmpeg.log.20200118
by burek 19 Jan '20

19 Jan '20

[00:08:46 CET] <fyr> hi I'm using -ss and -to with -c copy to cut segments out of footage that has multiple audio tracks, but only the first audio track gets copied into the copy [00:08:55 CET] <fyr> how can I map the other audio tracks? [00:12:30 CET] <pink_mist> probably by some -map invocation [00:13:01 CET] <fyr> hn [00:17:59 CET] <fyr> using -c:v copy -c:a:0 copy -c:a:1 copy doesn't work [00:20:26 CET] <furq> -map 0 [00:20:28 CET] <furq> to copy all streams [00:23:01 CET] <fyr> thanks +1 [00:23:33 CET] <fyr> i cut a load of footage up then deleted the original files without realising it hadn't copied the audio streams with -c copy [00:23:43 CET] <fyr> kinda not expected [01:55:15 CET] <DHE> fyr: the default behaviour is to select 1 video and 1 audio stream. I think it's intended to assist in the common case of swapping an audio stream by simply inputting a video file and then its replacement audio file [01:55:45 CET] <fyr> interesting thanks [06:30:44 CET] <Beam_Inn> for this command: `fmpeg -i v.mp4 -i a.wav -c:v copy -map 0:v:0 -map 1:a:0 new.mp4`, I'm trying to trim and place the audio. [06:30:55 CET] <Beam_Inn> do I need a separate set of commands? [06:36:41 CET] <Beam_Inn> https://superuser.com/questions/716320/ffmpeg-placing-audio-at-specific-loc… looking at this code, they're using multi-line code which is where it gets confusing for me. [06:36:51 CET] <Beam_Inn> can't ffmpeg all be done on a single line? [06:38:00 CET] <nicolas17> that is a single command [06:38:06 CET] <nicolas17> sp:it into lines to fit in the stackoverflow reply [07:07:01 CET] <Beam_Inn> oh. yeah, it just doesn't seem like i can split commands on windows without getting errors. but this command works to the purpose i was seeking [09:15:53 CET] <void09> can anyone explain how ffmpeg handles time ranges ? I'm thinking -ss is inclusive ( "[" ) while -to is exclusive ( ")" ) ? [11:16:58 CET] <void09> anyone know how to extract dvsub subtitles and if they can be later imported in any player ? [11:17:05 CET] <void09> dvbvsub* (from .ts file) [11:18:33 CET] <JEEB> what do you mean with "extract" [11:20:47 CET] <void09> just that :) [11:20:54 CET] <void09> extract to a file that contains just the subtitles [11:21:16 CET] <void09> but I am not sure if they have a specialized container format for them [11:21:31 CET] <void09> like .idx/.sub is for dvd subs [11:21:47 CET] <JEEB> not that I know [11:22:17 CET] <JEEB> I mean, there's a demuxer for raw dvbsub which I am not sure how well it works :P [11:22:29 CET] <JEEB> but I bet that would derp up the timestamps rather well [11:23:00 CET] <JEEB> since while I think the dvbsub things have their own offset timestamps, the actual PTS of the container packet is the primary thing [11:24:07 CET] <void09> fmpeg -i "movie.mkv" -map 0:5 -vn -an -scodec copy -f rawvideo dvbsub.dat [11:24:36 CET] <void09> found this command in a post, and it produced a 14.5MB file, seems about right. but it does not seem to be recognised by video players [11:25:13 CET] <JEEB> not surprising, raw dvbsub doesn't even have an extension set for it [11:25:23 CET] <JEEB> ffmpeg -f dvbsub -i blah.dat might do something [11:25:35 CET] <JEEB> but also I wouldn't be surprised if the timings were all over the place at that point [11:27:16 CET] <void09> it doesn't have an extension ? how did you check? [11:27:43 CET] <void09> with -f dvbsub: "[NULL @ 0x55a1f970b780] Requested output format 'dvbsub' is not a suitable output format" [11:27:43 CET] <JEEB> FF_DEF_RAWSUB_DEMUXER(dvbsub, "raw dvbsub", dvbsub_probe, NULL, AV_CODEC_ID_DVB_SUBTITLE, AVFMT_GENERIC_INDEX) [11:27:53 CET] <void09> oh, in the code, ok [11:27:58 CET] <JEEB> yes -f dvbsub on the output side won't work [11:27:59 CET] <JEEB> there is no muxer [11:28:08 CET] <JEEB> as in the example I posted, it was *before* -i [11:28:10 CET] <JEEB> so demuxing :P [11:28:17 CET] <JEEB> since it has no extension (which is the parameter after the _probe) [11:28:34 CET] <void09> oh i didn't see it was before -i [11:28:58 CET] <void09> not sure how it would help, ffmpeg already detects that stream as dvbsub [11:29:05 CET] <JEEB> also you can figure it out with -demuxer=dvbsub and compare it with -demuxer=matroska [11:29:11 CET] <void09> so explicitly telling it it's dvbsub .. ? [11:29:12 CET] <JEEB> it has no "common extensions" [11:29:22 CET] <JEEB> void09: yes. the probe probably fixes it for you with the .dat file [11:29:35 CET] <JEEB> which is a semi-controversial feature. since for various formats the probing gets... murky [11:29:49 CET] <JEEB> of course it also means that if someone renames a .ts file to .mp4 it will usually just work :P [11:30:18 CET] <JEEB> but due to probing you can also get random "mp3" streams because if you receive zero bytes for a probe => mp3 [11:30:32 CET] <void09> ffmpeg -f dvbsub -i "movie.mkv" -map 0:5 -vn -an -scodec copy dvbsub2.dat [11:30:37 CET] <void09> Segmentation fault (core dumped) [11:30:38 CET] <void09> lol [11:30:43 CET] <JEEB> nice [11:30:53 CET] <JEEB> you told it to read mkv as dvbsub [11:30:59 CET] <void09> you said so :P [11:31:10 CET] <JEEB> I meant for reading the .dat file if that was not obvious [11:31:13 CET] <void09> oh damn, i didn't read until the end [11:31:23 CET] <void09> second time i do that on that line lol [11:31:30 CET] <void09> first i just read -f dvbsub [11:31:38 CET] <furq> void09: you can mux just a dvbsub stream into mkv [11:31:41 CET] <void09> then i did not read the actual extension [11:31:43 CET] <furq> it works with mpv --sub-file [11:31:53 CET] <furq> probably nothing else though [11:32:04 CET] <JEEB> anyways, the tl;dr is taht there is no standard timestamp-keeping "subtitle format" for dvbsub [11:32:11 CET] <JEEB> you can technically write out the packets [11:32:13 CET] <void09> furq: so extract it raw to .dat, and mpv --sub-file sub.dat ? [11:32:22 CET] <furq> i don't think that's what i said [11:32:24 CET] <JEEB> and that can technically be read with lavf [11:32:30 CET] <JEEB> but that's the end of it :P [11:32:52 CET] <void09> furq: i already muxed it with mkvtoolnix, but i want to extract it, i don't want to keep a whole video file just for subs [11:33:17 CET] <JEEB> then I just recommend you put it into matroska without any other stream [11:33:18 CET] <JEEB> :P [11:33:33 CET] <JEEB> if you really just want to keep the dvbsub stream [11:34:02 CET] <void09> right, that works with mkvtoolnix, produces a .mks [11:34:20 CET] <furq> i had no idea that was even an extension [11:34:22 CET] <void09> I did not try the --sub-file route, just drag and drop, which attemps to open the file in mpv [11:34:24 CET] <furq> good to know i guess [11:35:18 CET] <furq> if mks is an actual thing it might be worth an mpv feature request to check if a matroska input is subtitle-only [11:35:41 CET] <void09> YES! [11:35:47 CET] <furq> shouldn't be too hard to detect [11:35:53 CET] <void09> so i can drag and drop it [11:35:57 CET] <furq> right [11:36:03 CET] <JEEB> it's a thing that mkvtoolnix will write with subtitle-only, yes [11:36:07 CET] <void09> cause who launches movies from command line with arguments [11:36:50 CET] <JEEB> but obviously mks is not really utilized much because it's matroska and thus you can just mux your streams [11:37:24 CET] <furq> yeah i've never seen it before [11:37:27 CET] <furq> it's an official recommendation though [11:37:28 CET] <void09> yeah well, this is for archiving/distribution for further processing etc purposes, not for muxing [11:37:44 CET] <furq> so you at least have something you can point to in the feature request without the devs thinking you're nuts [11:37:50 CET] <furq> https://matroska.org/technical/specs/subtitles/index.html [11:38:00 CET] <furq> not that the extension matters obviously [11:39:02 CET] <void09> oh look, mpv already recognizes and uses the external .mks sub file if the video file name matches [11:39:12 CET] <void09> and they're in the same folder, obviously [11:39:13 CET] <furq> neat [11:39:19 CET] <furq> drag and drop not working seems like an oversight then [11:39:30 CET] <void09> omg drag and drop works [11:39:43 CET] <void09> I remember it didn't.. sometime last year when i checked [11:39:59 CET] <furq> oh damn [11:40:05 CET] <furq> i guess the extension does matter then [11:40:18 CET] <JEEB> yea I don't think mpv does some probing for that [11:40:20 CET] <furq> i tried it with mkv a minute ago and it didn't work [11:40:24 CET] <furq> but it works after renaming [11:40:29 CET] <void09> maybe it was vlc and i remember wrongly [11:40:41 CET] <JEEB> so it's 100% based on extensions or so I bet :P [11:40:44 CET] <void09> vlc is indeed a little siller and stops playback trying to open the new .mks video lol [11:40:46 CET] <JEEB> since d&d generally is opening [11:40:47 CET] <furq> well it's obviously not based on probing [11:40:58 CET] <furq> all i did was rename the file [11:41:07 CET] <JEEB> yes, that is what I meant :P [11:41:13 CET] <JEEB> I just didn't look at the code and thus "I don't think" [11:41:42 CET] <furq> well i meant it must just be based on extensions [11:41:54 CET] <furq> can't think of any other magic that would be happening there [11:42:31 CET] <void09> hm there seems to be a problem though [11:42:44 CET] <JEEB> furq: that is what I meant [11:42:54 CET] <void09> ah nevermind, no problem [11:42:55 CET] <JEEB> I just noted that I didn't say it was doing that because I didn't look at the code [11:43:06 CET] <JEEB> but I was pretty sure it was just a list of extensions [11:43:07 CET] <JEEB> :P [11:44:05 CET] <void09> hm there seem to be no donation page for mpv [11:48:43 CET] <void09> so conclusion, there's no dvbsub muxer in ffmpeg. luckily mkvtoolnix does the job [11:52:28 CET] <furq> you can mux into mkv with ffmpeg [11:55:07 CET] <void09> 14.6 MB mkv with ffmpeg vs 6.8MB mks with mkvtoolnix [11:55:46 CET] <BtbN> sounds like you had higher quality encoder settings in ffmpeg than mkvtoolnix. [11:55:55 CET] <BtbN> Cause the muxing-overhead is identical [11:56:06 CET] <JEEB> or no compression of samples/extradata or whatever [11:56:26 CET] <BtbN> to more than double the file size? [11:56:30 CET] <BtbN> My guess is a missing -c copy [11:56:32 CET] <JEEB> or mkvtoolnix drops packets [11:56:47 CET] <JEEB> yea, no idea :P [11:56:53 CET] <JEEB> and not too interested in starting to compare whatever he did [11:57:29 CET] <void09> ffmpeg -i "movie.mkv" -map 0:5 -vn -an -scodec copy dvbsub.mkv [11:57:48 CET] <JEEB> mkvtoolnix could just be dropping duplicated configuration packets etc [11:57:51 CET] <JEEB> but yea, dunno [11:58:04 CET] <void09> yeah i found mkvtoolnix to try to optimize stream size [11:58:11 CET] <void09> like, it gets rid of h264 metadata [11:58:24 CET] <BtbN> Well, with -vn, there is no h264 to be had [11:58:35 CET] <void09> it was just an example. [11:58:42 CET] <void09> I am trying to extract dvbsubs here BtbN [12:00:49 CET] <void09> hah, mpv adds subtitles to audio files too, if they match names [12:11:29 CET] <void09> alright. so my previous question was about time ranges handing in ffmpeg [12:11:47 CET] <void09> <void09> can anyone explain how ffmpeg handles time ranges ? I'm thinking -ss is inclusive ( "[" ) while -to is exclusive ( ")" ) ? [12:17:07 CET] <void09> JEEB: ? :) [12:20:14 CET] <void09> just to be clear, "ffmpeg -ss A -to B", and "ffmpeg -ss B -to C" should not have any overlapping frames, right ? (assuming raw video, and no keyframe hassle [13:08:23 CET] <void09> hmm [14:14:28 CET] <void09> hello [14:15:28 CET] <durandal_1707> void09: please state your issue [14:16:07 CET] <void09> durandal_1707: found a video that is seeked/cut differently by ffmpeg if given the same end timestamp but different start timestamp [14:17:16 CET] <void09> ffmpeg -i file.mkv -ss 00:02:15.844 -to 00:02:16.845 -crf 0 short.mkv - produces correct result [14:17:45 CET] <void09> ffmpeg -i file.mkv -ss 00:01:59.619 -to 00:02:16.845 -crf 0 long.mkv - produces a result with +1 frames at the end vs short.mkv (and thus wrong) [14:18:14 CET] <void09> any ideas how we can get to the bottom of this? [14:18:32 CET] <void09> or if that behaviour is to be expected in some scenarios ? video is a remux of a bluray [14:38:30 CET] <void09> durandal_1707: can I send you the video to take a look at ? [14:53:20 CET] <durandal_1707> only if you pay me for consulting time [14:55:59 CET] <void09> ok, let's go to #ffmpeg-corporate-consulting [15:13:42 CET] <void09> This page is a list of those FFmpeg developers that are available for employment or consulting. The FFmpeg project highly recommends these people to be hired by your business. All developers on this list maintain some code in FFmpeg, which serves as a testimony for their competence. By hiring one of these developers, your business can also (indirectly) support the development of FFmpeg. [15:13:45 CET] <void09> oh you were serious, lol [15:45:35 CET] <mosasaur> I'm trying to cut some ads from the middle of a large .mp4 video. But I've run into a few problems, first there is a trim command that seems to do the opposite of what I want: it selects single pieces of what I want to keep, instead of cutting stuff out from the middle, second, I have found no way to do this operation without re-encoding, which is slow and uneccesarily causes me headaches about how to get the same quality out as existed in the [15:45:35 CET] <mosasaur> source file. My question is, this seeming to be a relatively common operation, is there some userscript that I can use for this, or, maybe even a standard command? Failing that, where should I start reading to understand the situation better, especially with the respect to the re-encoding, is that really necessary and unavoidable? [16:04:40 CET] <Soni> does ffmpeg support many rates of DSD decoding? [16:06:51 CET] <void09> mosasaur: I [16:07:04 CET] <void09> mosasaur: I've been cutting videos for a while now, it's a bitch :( [16:07:12 CET] <void09> did you try avidemux ? [16:07:37 CET] <durandal_1707> Soni: yes [16:08:12 CET] <Soni> so it can handle everything from DSD64 to DSD512? [16:09:11 CET] <durandal_1707> Soni: yes, but note that DSD512 uses very high sample rate [16:10:02 CET] <Soni> durandal_1707: I'm just mixing 8 DSD64 streams together in a very crappy way. [16:11:17 CET] <mosasaur> void09: thanks. Checking that out now :) [16:12:11 CET] <void09> mosasaur: there's programs that can cut to precise frame , by encoding the part to the nearest keyframe, but I don't know of any free one [16:12:22 CET] <void09> videoredo is a commercial one that can do that [16:12:53 CET] <JEEB> there was one using libav* APIs [16:13:07 CET] <void09> JEEB: find it please ? :) i'm interested [16:13:43 CET] <JEEB> it's been a while since I've last opened that github project [16:13:49 CET] <JEEB> so I don't think I have it in my current history [16:13:56 CET] <void09> search terms then ? [16:14:46 CET] <void09> mosasaur: otherwise if you don't have keyframes exactly where the non-commercials part begins, you will have to "cut" the video using mkv chapters. not sure if mp4 supports that [16:15:06 CET] <void09> and I never got perfect results, unfortunately [16:15:14 CET] <mosasaur> void09: I've been playing around a bit with ffmpeg-python, if there's a way to find the nearest frame I could trim there, though I think the re-encoding requirement doesn't start with the trim command but with the concat command [16:15:16 CET] <JEEB> mov/mp4 is where the basis of what became virtual timelines in matroska [16:15:37 CET] <JEEB> so yes, edit lists in mov/mp4 it's even more powerful [16:16:14 CET] <JEEB> the problem is that most things don't want to support above simple edit lists since they're not exported nicely out of lavf and the google-written support is kind of awful [16:16:25 CET] <JEEB> mpv f.ex. just disables google's advanced edit list support [16:16:55 CET] <JEEB> mov/mp4 is also where the whole segment linking thing came from [16:17:06 CET] <JEEB> where you can link specific samples and all kind of insane stuff [17:03:48 CET] <void09> so no chance in finding that github repo JEEB ? [17:04:56 CET] <durandal_1707> JEEB is busy with real life issues right now [17:05:17 CET] <JEEB> I decided to not use my time in trying to find it, also I might have mistaken it with the thing generating a new mp4 index with stuff [17:08:12 CET] <JEEB> in theory making such an application just requires you to parse the currently utilized parameter sets and see if you can replicate content so that it matches that. of course means that you can't just randomly support whatever encoder, but if you keep to libx264 or so, you can write mappings [17:08:17 CET] <JEEB> then indexing and other stuff [17:08:28 CET] <JEEB> just requires time and interest in the problem [17:23:33 CET] <void09> I am not really that interested in it. I am interested in lossless cuts with chapters to cut over the few frames of extra video [18:03:30 CET] <LFSVeteran> One simple command: [18:03:31 CET] <LFSVeteran> AVFormatContext **input_format_context; [18:03:32 CET] <LFSVeteran> avformat_open_input(input_format_context, "http://192.168.2.12:8000/stream", NULL, NULL); [18:03:32 CET] <LFSVeteran> exit(1); [18:03:39 CET] <LFSVeteran> causes segmentation fault [18:51:28 CET] <kepstin[c]> LFSVeteran: that happens when you pass uninitialized pointers to C code, yes [18:52:02 CET] <kepstin[c]> hmm, actually, i need to double-check how exactly the open_input api is specified [18:52:49 CET] <kepstin[c]> but I think what you want is `AVFormatContext *input_format_context = NULL; then avformat_open_input(&input_format_context, ...)` [18:53:26 CET] <kepstin[c]> notice that your code only has a single pointer, and it's initialized [18:53:47 CET] <kepstin[c]> and then you pass the address of your pointer to open_input, and that will update your pointer to point at a newly allocated context. [19:14:12 CET] <LFSVeteran> *input_format_context = NULL; [19:14:12 CET] <LFSVeteran> avformat_open_input(input_format_context, "http://192.168.2.12:8000/stream", NULL, NULL); [19:14:12 CET] <LFSVeteran> exit(1); [19:14:17 CET] <LFSVeteran> same result [19:19:13 CET] <Soni> ah yes $(printf 'NAME=%q ffmpeg -i "$NAME" converted/"$NAME".flac \n' *.*) [21:27:16 CET] <LFSVeteran> hmm [21:27:18 CET] <LFSVeteran> AVFormatContext *input_format_context; [21:27:18 CET] <LFSVeteran> input_format_context = NULL; [21:27:20 CET] <LFSVeteran> goes well [21:27:23 CET] <LFSVeteran> but [21:27:33 CET] <LFSVeteran> AVFormatContext **input_format_context; [21:27:33 CET] <LFSVeteran> *input_format_context = NULL; [21:27:34 CET] <LFSVeteran> fails [21:44:38 CET] <DHE> LFSVeteran: you haven't allocated the pointer yet, so that's expected. [21:44:42 CET] <DHE> that's just basic C [21:45:13 CET] <DHE> normally you would only have such a data type (AVFormatContext**) as a parameter type to a function [21:45:56 CET] <LFSVeteran> indeed, I never used **, looks weird to me [21:46:14 CET] <LFSVeteran> Changed the code to the first option [21:46:32 CET] <LFSVeteran> less change for trouble [21:47:17 CET] <LFSVeteran> now checking why avformat_open_input fails to open [22:31:51 CET] <LFSVeteran> avformat_open_input complains about Invalid data found when processing input, the same ffmpeg does if I specify only the URL : ffmpeg -i http://192.168.2.12:8000/stream [22:32:05 CET] <LFSVeteran> if I specify the format to ffmpeg it goes well: ffmpeg -f s32le -i http://192.168.2.12:8000/stream [22:32:06 CET] <JEEB> LFSVeteran: there's usually two reasons to use ** (address of a pointer to a memory address). either a) when you want to modify a *var of your calling code (you take a memory reference to where that memory location is kept) , or b) if you have a list of pointers [22:32:51 CET] <JEEB> LFSVeteran: yea if one cannot guesstimate the format from the URL or easily probed, then you have to force the format [22:32:56 CET] <JEEB> as in, demuxer [22:33:26 CET] <LFSVeteran> I guess I have to use the third parameter? [22:33:39 CET] <LFSVeteran> avformat_open_input(&input_format_context, "http://ip:port/stream", NULL, NULL) > avformat_open_input(&input_format_context, "http://ip:port/stream", fmt, NULL) [22:34:30 CET] <LFSVeteran> how to fill fmt [22:34:34 CET] <JEEB> I think it was one of the parameters, yes [22:35:34 CET] <JEEB> it's an AVInputFormat that you need [22:35:46 CET] <JEEB> https://svn.ffmpeg.org/doxygen/trunk/avformat_8h.html [22:35:50 CET] <JEEB> ctrl+F AVInputFormat [22:35:58 CET] <JEEB> and I bet you will find a few functions returning one for you [22:36:09 CET] <JEEB> and one of the functions takes in that short name of the demuxer [22:36:39 CET] <JEEB> you just check that you find that and don't get a nullptr back [22:36:48 CET] <JEEB> and if you're OK you feed it to avformat_open_input [22:55:24 CET] <LFSVeteran> https://pastebin.com/igv7PF8Y [00:00:00 CET] --- Sun Jan 19 2020

1 0

ffmpeg-devel.log.20200117
by burek 18 Jan '20

18 Jan '20

[00:00:00 CET] --- Fri Jan 17 2020

1 0

ffmpeg.log.20200117
by burek 18 Jan '20

18 Jan '20

[00:35:52 CET] <midn> Does this place help with constructing commands for newbies? [06:44:24 CET] <joules> hi, can anyone recommend a ppa for 4.1? really wanna check out the tmix filter ;) [06:44:56 CET] <joules> (ubuntu, sorry if off topic - big ffmpeg user so i don't have any "how to" questions) [12:02:31 CET] <Shezi> Hi, I am converting an mp4 video with h264 codec and aac audio. While converting it throws error like "invalid NAL unit size". Is there a way to fix such video? Thank you [12:03:06 CET] <joules> paste the command. [12:03:23 CET] <joules> if it's long use a paste site. [12:03:48 CET] <joules> Shezi: also get the orignal video specs with ffprobe. [12:04:04 CET] <joules> you need to actively convert FROM that. [12:05:26 CET] <Shezi> ok. Let me gather all the information. [12:09:55 CET] <Shezi> This is ffprobe of file. https://pastebin.com/tUVaL7V8 [12:10:26 CET] <joules> that's for you though. [12:10:34 CET] <furq> invalid nal unit size is a decoder error [12:10:42 CET] <joules> -vf <insert stuff> [12:10:47 CET] <furq> there's not really much you can do about that other than upgrade, and you're already on a recent version [12:11:46 CET] <Shezi> joules, I didn't get it. Do you need detailed json information of video? [12:11:59 CET] <joules> no the video looks fine. [12:12:08 CET] <Shezi> Actually the video has some issue and i am trying to convert the video to fix those issues. [12:12:27 CET] <Shezi> But it seems it throws tons of invalid NAL unit size error at specific timemark. [12:12:34 CET] <joules> oh [12:12:39 CET] <joules> how big is the file? [12:12:42 CET] <furq> yeah the video is probably bitrotted around that mark [12:13:02 CET] <Shezi> Its 1.3 GB [12:13:16 CET] <Shezi> Is there some flags that can be passed to fix these issues? [12:13:23 CET] <furq> probably not [12:13:28 CET] <furq> most likely it's just a broken input video [12:13:42 CET] <furq> the workaround would be to just ignore the errors but you'll obviously get some garbled frames at that point [12:14:00 CET] <Shezi> Ok. how do i ignore this. [12:14:11 CET] <furq> is it actually stopping the conversion when it happens [12:14:21 CET] <furq> that message is just a warning iirc [12:14:25 CET] <Shezi> No, but the video does not play after that time mark. [12:14:31 CET] <furq> after conversion? [12:14:37 CET] <joules> so it doesn't play? [12:14:41 CET] Action: joules dies [12:14:52 CET] <Shezi> Yes, it does not play after that specific time mark. [12:14:58 CET] <Shezi> I tried even handbrake tool. [12:15:05 CET] <Shezi> but to no avail. :\ [12:15:06 CET] <joules> ok. then it that's that. [12:15:21 CET] <joules> decoders use the same decoders. [12:15:59 CET] <Shezi> Is it possible to replace those broken frames with something like blank frames [12:16:00 CET] <furq> can you seek past the error in the source file [12:16:08 CET] <Shezi> No. [12:16:24 CET] <furq> yeah it sounds like it's completely broken from that point on [12:16:26 CET] <joules> maybe just dump it all to pngs. [12:16:57 CET] <furq> if you can't seek to like five minutes past that timestamp then i assume the whole thing is messed up [12:16:59 CET] <Shezi> So if the file is seekable after that specific timemark, then there is some hope? [12:17:04 CET] <furq> yeah [12:17:33 CET] <Shezi> Ok, great. What is the flag that can be passed to replace those broken frames with some garbled frames? Its for my information. [12:17:43 CET] <furq> if it's just a few corrupt packets then it should be fine after the next idr frame [12:18:01 CET] <Shezi> I mean if the file is seekable after specific broken frames timemark. [12:18:35 CET] <furq> it should just drop those frames by default [12:19:17 CET] <Shezi> Ok, but is there a way to replace those frames? I mean for streaming some times it fails. [12:19:40 CET] <Shezi> ffmpeg just exits, if it sees those broken frames during streaming to rtmp server. [12:19:50 CET] <furq> maybe force -vsync cfr [12:20:10 CET] <Shezi> Ok Great. I will try that. [12:20:25 CET] <Shezi> Thank you very much joules and furq and all the ffmpeg community. :) [12:22:11 CET] <joules> im just a grifter furq is long time dude ;) [12:23:40 CET] <joules> i remember the ffmpeg avconv wars of ..some year. [12:46:50 CET] <Shezi> :) [17:23:31 CET] <TanaPanda> anyone familiar with dvblast? [00:00:00 CET] --- Sat Jan 18 2020

1 0

ffmpeg-devel.log.20200116
by burek 17 Jan '20

17 Jan '20

[00:00:00 CET] --- Thu Jan 16 2020

1 0

ffmpeg.log.20200116
by burek 17 Jan '20

17 Jan '20

[00:07:36 CET] <cehoyos> Attached images currently only work for flac and mov, this is not a trivial feature to add. [00:09:18 CET] <cehoyos> It also works for mp3 using different apis [00:13:52 CET] <fatturtle> Thats too bad. Oh well. [00:18:56 CET] <furq> fatturtle: opusenc supports flac input and cover art [05:57:01 CET] <void09> anyone here knowledgeable about bluray's m2ts format? [05:58:32 CET] <void09> I was wondering how hard it would be to reconstruct an original m2ts file from an mkv remux of it. what would you need to backup from it, in order to reconstruct it (except the actual audio/video/sub stream) ? [05:58:46 CET] <void09> bit perfect reconstruction that is [09:04:18 CET] <kurosu> michaelni: if (get_bits_left(gb) < width) return AVERROR_INVALIDDATA; <- there are probably several codecs that would benefit from moving such checks to a higher-level loop, if possible (thanks captain obvious) [09:04:27 CET] <kurosu> but speed-vs-security trade-off [09:04:48 CET] <kurosu> ouch wrong channel XD [12:12:08 CET] <JulietDeltaGolf> hi ! [12:35:49 CET] <JulietDeltaGolf> I'm converting a 2K DPX sequence to FFv1. Is there some option I'm missing on the cmdline to speed things up ? [12:36:13 CET] <JulietDeltaGolf> ffmpeg.exe -framerate 24 -i "frame_%06d.dpx" -c:v ffv1 -coder 1 -context 1 -g 1 -level 3 -threads 64 -slices 64 -slicecrc 1 -f matroska NUL [12:36:47 CET] <JulietDeltaGolf> looks like a part of the encode is single threaded as I do see one core close to a 100% [12:37:18 CET] <JulietDeltaGolf> also why does ffmpeg do not recommend going above 16 threads for ffv1 ? [12:37:49 CET] <durandal_1707> dpx decoder is not supporting multiple threads [12:38:15 CET] <durandal_1707> support could be added ... [12:38:36 CET] <JulietDeltaGolf> oh ... [12:39:15 CET] <JulietDeltaGolf> but isn't it just a matter of opening the file and putting the content in memory isn't it ? [12:39:25 CET] <JulietDeltaGolf> a single core should be able to do more than 12 fps ... [12:40:26 CET] <durandal_1707> JulietDeltaGolf: try with only dpx decoding and compare [12:41:00 CET] <JulietDeltaGolf> ffmpeg.exe -framerate 24 -i "frame_%06d.dpx" -c:v r210 -f matroska NUL [12:41:03 CET] <JulietDeltaGolf> would this do the trick ? [12:41:19 CET] <JEEB> -f null - [12:41:37 CET] <durandal_1707> just do: ffmpeg.exe -framerate 24 -i "frame_%06d.dpx" -f null - [12:41:42 CET] <JEEB> yea that [12:41:58 CET] <JEEB> that way it will utilize whatever data comes out of the decoder [12:48:30 CET] <JulietDeltaGolf> 24 fps [12:48:48 CET] <JulietDeltaGolf> average 70% one one core [12:51:59 CET] <durandal_1707> afaik if decoder is single threaded it will use single thread even for encoding [12:58:15 CET] <DHE> no you can have a single threaded decoder and multithreaded encoder. ffmpeg doesn't care... [13:00:25 CET] <JulietDeltaGolf> so if my single threaded dpx decoder can push 24 fps of content into the pipeline [13:01:11 CET] <JulietDeltaGolf> is there something I can do to speed up ffv1 encoding then ? [13:05:46 CET] <durandal_1707> DHE: but performance will suffer greatly as experiment here shows [13:06:24 CET] <durandal_1707> JulietDeltaGolf: pay some developer to speed up dpx decoder [13:07:23 CET] <JulietDeltaGolf> yeah apparently I'll have to speed up matroska wrapper as well [13:07:46 CET] <JulietDeltaGolf> dropping the wrapping got me from 11 fps to 16 fps [13:47:09 CET] <familiyaF> I am writing an application using libav with CUDA transcoding. is there a way to determine if the input pixel format is supported by cuvid or not [13:49:00 CET] <JEEB> the encoders have a pix_fmts listing [13:49:07 CET] <JEEB> but the problem is that it probably depends on the hardware etc you have [13:49:33 CET] <JEEB> so the encoder wrapper might say it supports something, but with old enough drivers or hardware it might not [13:49:36 CET] <JEEB> :P [13:49:43 CET] <JEEB> this will get caught when you try to open the encoder most likely or so [13:50:34 CET] <familiyaF> ok [13:50:36 CET] <Azlux> Do there are any memory leak issue on ffmpeg ? User of my bot experience it since they have upgrade to last debian verison : 4.1.4-1~deb10u1. [13:50:36 CET] <Azlux> This bot use this command : https://github.com/azlux/botamusique/blob/master/mumbleBot.py#L668 [14:44:33 CET] <pagios> -strict -2 -crf 18 <-- where can i read aboutthose params [14:48:49 CET] <DHE> when in doubt https://ffmpeg.org/ffmpeg-all.html has literally everything, but it's a huge document [14:53:54 CET] <cehoyos> Azlux: Many bugs exist, please test current FFmpeg git head and provide valgrind output for memleaks [14:54:52 CET] <cehoyos> pagios: I don't think you can read about "strict -2" (or actually I don't think the answer would help you) but if you provide the command line you tested together with the complete, uncut console output, we may be able to help you [14:55:20 CET] <pagios> waht is strict -2 :) [14:55:22 CET] <pagios> and -crf [14:56:32 CET] <DHE> -strict -2 unlocks options, parameters and codecs that either break the normal rules/standards of video encoding or lets you use experimental/in-development codecs and features [14:57:19 CET] <JEEB> -strict experimental is the non-number version of that [15:02:00 CET] <pagios> any recommended books to understand basics for video/audio? would make more sense then if i want to learn to tune [15:09:47 CET] <pagios> JEEB, DHE? i would like to learn the basics of video and all this stuff , really back to basics [15:29:53 CET] <ocx32> hi all! i am trying to optimize hls latency i am using -preset:v ultrafast -hls_time 1 -hls_list_size 10 <--- can i still optimize it more even if create more disk io? want to lower latency thanks! [15:32:47 CET] <DHE> HLS just isn't intended to be a low latency format. even that will give you ~2 seconds of delivery latency at very best. [15:33:18 CET] <ocx32> DHE yea i am aiming for 2 3 sec [15:33:29 CET] <ocx32> i am getting around 20sec with that config [15:33:36 CET] <ocx32> what can i optimize [15:34:09 CET] <DHE> what's your full ffmpeg commandline? (censor passwords or anything sensitive with "XXXX" or whatever, but omit nothing) [15:35:06 CET] <ocx32> DHE: -i rtmp:/.... -vf scale=1280:720 -vb 2500k -g 90 -framerate 30 -preset:v ultrafast -hls_time 1 -hls_list_size 10 -f hls /..../x.m3u8 [15:35:40 CET] <DHE> okay, -g 90 means a keyframe is every 90 frames. at 30fps that's 3 seconds between keyframes. and that is effectively overriding your -hls_time 1 parameter [15:36:09 CET] <ocx32> oh! [15:37:03 CET] <bencoh> /41/59 [15:37:07 CET] <bencoh> (woops) [15:38:32 CET] <ocx32> DHE anything else i can optimize? [15:39:36 CET] <DHE> if it really really matters you can try -tune:v zerolatency but there will be an image quality hit [15:39:49 CET] <DHE> but with ultrafast mode it's not likely to have as much of an effect [15:40:33 CET] <ocx32> ultrafast is ok [15:41:10 CET] <ocx32> i mean the quality i am getting now [15:47:03 CET] <ocx32> i am still getting 10sec , a bit better [15:49:44 CET] <ocx32> DHE: actually the -g 30 when removed didnt make any difference, i jsut noticed [15:50:38 CET] <bencoh> -g 30 or -g 90 ? [15:50:52 CET] <DHE> and what do you mean "removed" ? [15:56:33 CET] <ocx32> DHE i mean i removed from the command the -g 90 [16:01:16 CET] <DHE> ocx32: put it back and set it to 30 [16:01:36 CET] <ocx32> DHE i just did this 5 minutes ago :) [16:01:47 CET] <ocx32> still same results [16:09:53 CET] <ocx32> any idea? [16:18:29 CET] <ocx32> DHE? [16:45:24 CET] <DHE> sorry am busy [16:48:19 CET] <ocx32> sure [17:59:43 CET] <lofo> i'm trying to debug my command ffmpeg -f avfoundation -i "0" -f rtp_mpegts -c:v libx264 rtp://192.168.1.47:1234 [18:00:06 CET] <lofo> i get a ton of `Non-monotonous DTS in output stream 0:0; previous: 552, current: 50; changing to 553. This may result in incorrect timestamps in the output file.` on console output [18:59:24 CET] <CpAj0> hello, i need to create a new video file file given one or more segment of duration, is possible to do with ffmpeg? [19:42:39 CET] <antto> is there a way to rotate by 180° (or flip vertically and horizontally) a video quickly with minimum loss? [19:43:46 CET] <BtbN> Some containers have flags instructing the player to rotate on playback [19:43:52 CET] <BtbN> But other than that, not really [19:43:52 CET] <antto> i've captured it like that due to camera/tripod setup, but now if i put flip X/Y or transform effects in kdenlive to fix it, the preview becomes very slow, i'd like to "preprocess" it maybe [19:44:20 CET] <BtbN> It will be a fully re-encode, which comes with quality loss [19:44:23 CET] <BtbN> -y [19:44:28 CET] <antto> right [19:45:23 CET] <antto> "ffmpeg -i in.mp4 -filter:v "transpose=1,transpose=1" out.mp4" <- like this? [19:46:52 CET] <SoMuchForSubtlet> Is there a simple way to save the highest resolution video track and all audio tracks (or the audio track in a specific language) from a master m3u playist like this? https://pastebin.com/raw/bZPBB3sV I know I can use ffprobe to find the desired tracks, but I want to know if there is a simpler and quicker way. Thank you [19:47:38 CET] <durandal_1707> antto: flip use hflip/vflip filters [19:48:08 CET] <Hello71> I don't see how that would be different from transpose,transpose [19:48:19 CET] <antto> whichever runs faster [19:48:48 CET] <antto> i know a rotation algorithm is gonna be brutal, while a mere flip is gonna be much easier [19:49:04 CET] <Hello71> well you definitely shouldn't use rotate [19:49:40 CET] <antto> yeah, but it seems like in kdenlive transform and flip result in roughly equal "slowness" [19:49:58 CET] <antto> so you never know ;P~ [19:51:28 CET] <antto> ffmpeg -i in.mp4 -vf "hflip,vflip" out.mp4 ? [19:54:11 CET] <antto> the video is also not 1:1 pixel aspect [19:55:41 CET] <BtbN> What does the -ar cli option do exactly? Automatically insert an aresample filter? [20:04:01 CET] <BtbN> From how I understand the loudnorm documentation, it by default, in linear mode, should not resample to 192k? [20:04:11 CET] <BtbN> The code is very unclear about the whole resampling [20:16:32 CET] <matto312> Hello! I've been stuck on an issue for a long time and I just can't get past it ... I have live RTMP input and multi-variant HLS out ... sometimes when I start FFMPEG the screen gets flooded with "DTS 4294991118, next:2147507469961 st:1 invalid dropping" & "PTS 4295057956, next:2147574306250 invalid dropping st:1" messages ... I'm pretty desperate, just any direction on what to look at it would be so much appreciated. [20:16:52 CET] <matto312> like any thoughts at all on where to investigate [20:24:02 CET] <matto312> Just like any random thought that comes to your head that could help me out [20:24:15 CET] <matto312> i'm desperate I will send money [00:00:00 CET] --- Fri Jan 17 2020

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