[04:28:42 CET] <jookiyaya> didn't workcan you people tell the difference between x264 video and apple h264 encoded video [05:03:33 CET] <tacosforall> Hi... I'm trying to render an animation but I'm getting inconsistent keyframing in x264. Each frame should appear four times per 30 frames but I'm seeing inconsistent results. I realize this is a well-documented scenario but I've been coding video and audio software for 20 years (really!) and I'm seeing weirdness no matter what I try with keyframes, time bases, and various filter tricks. Can someone give me some top-level guidel [05:05:40 CET] <tacosforall> Specific to what I'm doing, I'm using a concat filter (-f concat -i input.txt) with images and duration lines. The file length is exactly what it should be. However the durations jitter. [05:06:12 CET] <tacosforall> [You really should be able to just specify frames instead of durations, however apparently this is a 10 year open issue that will not get resolved.] So here I am. [05:13:25 CET] <tacosforall> I'm staring at ffprobe output that's clearly a bug. I'll file it. Thank you for the silence, it was soothing. [05:42:04 CET] <fling> Which container to use for opus only stream? [05:47:47 CET] <c_14> ogg? [05:47:56 CET] <c_14> Or any container that supports opus? [07:10:38 CET] <limbo_> what's the best way to re-encode an mp3 without losing any quality when mediainfo doesn't show any duration for it, and itunes shows the incorrect duration? I've already done ffmpeg -i <in> -codec copy <out> [07:19:54 CET] <kepstin> limbo_: you probably want to use the standalone "vbrfix" tool [07:20:08 CET] <kepstin> it'll analyze the mp3 file and add the missing vbr info header [07:25:34 CET] <limbo_> ok. where can I find it and how do I use it? Before I ran it through ffmpeg, mediainfo told my it was constant bitrate. [07:26:11 CET] <kepstin> if the file doesn't have the vbr header, most programs just read the bitrate of the first frame and say the file's cbr with that bitrate [07:26:25 CET] <kepstin> and then they'll often get wrong or missing length estimates [07:26:46 CET] <kepstin> cbr mp3 files don't store the length anywhere - you guess it by dividing file size by bitrate [07:27:08 CET] <kepstin> vbr files need a special header with extra info to determine the length (unless you analyze the entire file) [07:27:44 CET] <kepstin> but yeah, just google "vbrfix". there's a window binary available, and it's packaged in at least some linux distributions. [07:30:45 CET] <limbo_> mediainfo tells me that the outputted files are variable bitrate. [07:37:06 CET] <limbo_> I'm running it, an getting this output (with errors) https://paste.debian.net/414108/ and lines in other runs like "Warning - more than one id3v1 tag found using last found" [07:50:50 CET] <kepstin> fun. your file is actually multiple mpeg audio files (apparently not even the same mpeg version) which have been concatenated without so much as removing the tags [07:50:58 CET] <kepstin> no wonder tools aren't working properly with it [07:51:37 CET] <kepstin> hmm, could be wrong, but either way it's an oddly broken file. [07:57:17 CET] <limbo_> damn. [07:57:24 CET] <limbo_> well, that's 2001 for you. [07:57:49 CET] <limbo_> I have a couple of files, an I guess some of them are fine then. [07:58:44 CET] <limbo_> any suggestions on how best to re-encode these so I can at least play these on an ipod without them failing to seek properly or jumping aroung the place every twenty or so minutes? [08:05:30 CET] <limbo_> They're meant to be about 30kbps, so I don't know what to even re-encode them to. [08:10:16 CET] <kgkg> Hiall! I am trying to forward an IP Camera to youtube but get a "Failed to update header" error. CLI and error: http://pastebin.com/KJX9mZFV [09:22:40 CET] <wmp> hello [09:23:11 CET] <wmp> i have capture dark(night) video from security camera [09:23:22 CET] <wmp> and i want to remove duplicated frames [09:23:31 CET] <wmp> all works on videos with light [09:24:19 CET] <wmp> but when is dark ffmpeg not remove any frames, becouse is differences on single pixels [09:25:22 CET] <wmp> this is my ffmepg options: "-vf "select=gt(scene\,0.00001),setpts=N/(25*TB)" -f segment -segment_time 120 -segment_format mp4 -strftime 1 -reset_timestamps 1" [09:34:03 CET] <jookiyaya> 1.846153846153846] [09:39:40 CET] <aRDa_> hi [09:40:20 CET] <aRDa_> I'm new with ffmpeg I'm recording (from debian jessie) making a video of my screen with the following command: ffmpeg -video_size 1366x768 -f x11grab -r 25 -i :0.0 -qscale 0 video.avi [09:40:36 CET] <aRDa_> but the sound is not recorded, any ideas why ? [11:28:25 CET] <cba321> hello is this the dev channel..i got a message from the compilation of ffmpeg to not report a bug but instead contact ffmpeg.org [11:29:23 CET] <cba321> since the message said "please do not contact Google or someone...i am trying to comply." [11:53:56 CET] <DHE> cba321: there is a distinct dev channel, but you might be better off making a ticket on the trac page... (assuming one doesn't already exist) [12:09:29 CET] <cba321> well it looks like there are no developers around at this time...perhaps a few google spies who need to be incarcerated....especially since some of the code is relevant to vp8/vp9 and so on. [12:10:49 CET] <cba321> nothing is sicker than monstrous 800 pound gorillas trying to steal and capitalize on small people's ideas. [12:14:07 CET] <cba321> and i say a hearty ...fuck you crooked nigger dick suckin Jew bastards... [13:23:50 CET] <andrey_utkin> can I ask anybody how to optimize performance of now-stable ffmpeg's aac encoder? http://permalink.gmane.org/gmane.comp.video.ffmpeg.devel/210082 [13:24:09 CET] <andrey_utkin> (link: maillist post by subject "AAC encoder 3x performance drop in 3.0 since Oct 2014") [13:25:04 CET] <andrey_utkin> oh there was a discussion, gonna read [13:46:19 CET] <fenris_mid> saluton. i try to compile ffmpeg git-commit 66edd8656b851a0c85ba25ec293cc66192c363ae and get the following error: libavcodec/h264pred_template.c:1276:19: internal compiler error: in vect_transform_stmt, at tree-vect-stmts.c:8176 [13:46:36 CET] <fenris_mid> does anybody have an idea what the problem could be? [13:46:57 CET] <fenris_mid> is it really just gcc's fault? [13:46:57 CET] <nevcairiel> which compiler? [13:47:17 CET] <fenris_mid> g++ (Debian 6-20160109-1) 6.0.0 20160109 [13:47:38 CET] <nevcairiel> so a pre-release compiler then, likely its fault [13:47:44 CET] <fenris_mid> k [13:48:07 CET] <nevcairiel> best would be to double check with gcc 5, and report the problem to the gcc developers so its fixed before 6 is released [13:49:55 CET] <flux> fenris_mid, I bet the developers would be ecstatic if you were able to infer a minimal reproduciton for it ;) [13:50:23 CET] <flux> probably these vectorization things are quite the bleeding edge stuff anyway in GCC.. [13:51:47 CET] <jkqxz> If you do report it to gcc then you'll probably want to reproduce on something more recent than two months ago first. [13:56:13 CET] <wmp> I have video from security camera, i want to speed up if isn;t motion on video, how can i do this? [14:03:41 CET] <andrey_utkin> wmp, cool idea. Maybe a custom video filter could do that. Analyze frame-to-frame difference and increment the timestamps reverse-proportionally to amount of changes [14:05:56 CET] <BtbN> Or dump it to individual frames, and then compare the difference between the frames, and if it's small enough, discard the later one [14:06:18 CET] <wmp> but i need to do fast ;) [14:07:39 CET] <wmp> now i test this: ffmpeg -y -i short.avi -an -vf "select='gt(scene\,0.02)',setpts=0.1*PTS" output_0.02_0.1.avi [14:11:53 CET] <J_Darnley> That looks like it will create horribly out of order images [14:12:20 CET] <J_Darnley> oh wait, I misread [14:12:24 CET] <J_Darnley> ignore that [14:31:26 CET] <wmp> J_Darnley: unfortunatelly, this dont detect if in room is man, so this dont works... [14:42:35 CET] <J_Darnley> And if a guy stands still in the middel of the frame there won't be any changes either [14:43:05 CET] <J_Darnley> It sounds like you want to go to computer vision levels of analysis [14:43:06 CET] <louiz> You could get a Paranormal Activity effect, automatically. [14:43:19 CET] <J_Darnley> Somethign that is not available in ffmpeg [14:44:02 CET] <wmp> :/ [14:48:07 CET] <wmp> J_Darnley: do you know in what software can i do it? [14:48:33 CET] <J_Darnley> nfi [14:48:42 CET] <J_Darnley> you will probably have to write your own [14:48:55 CET] <wmp> :( [14:53:30 CET] <andrey_utkin> wmp: opencv? [14:55:11 CET] <andrey_utkin> I can connect you with a guy who has written opencv-powered motion detection on frames provided by ffmpeg. The existing code is proprietary, though, so cannot be shared, but you could contact the guy [14:55:21 CET] <BAWSTi> Hey guys, is it normal that by using following command I don't get the file size information? 'ffmpeg -i inputFile.mp2' And if this is the way it is supposed to act, how can I get the file size? [14:56:51 CET] <wmp> andrey_utkin: now i looking for this: http://superuser.com/a/818412 [14:58:33 CET] <andrey_utkin> cool! thanks for sharing wmp. I wonder what "mp" in filter name stands for. Motion ...? [14:59:23 CET] <andrey_utkin> BAWSTi, you can get size by "ls -l file" or "stat file" [15:00:19 CET] <BAWSTi> andrey_utkin: so like ffmpeg -ls -l inputFile.mp2? [15:00:43 CET] <J_Darnley> No! [15:00:58 CET] <J_Darnley> Use the basic unix tool called ls [15:01:37 CET] <J_Darnley> Or are you not on Linux or mac os? [15:01:41 CET] <BAWSTi> oh, yea well that's gonna be a problem since that would require that much more work xD I'm actually using ffmpeg cli on android ;) [15:02:04 CET] <J_Darnley> Well then, how would you get the size of any file? [15:02:28 CET] <andrey_utkin> ffmpeg cli on android - what's that? [15:02:49 CET] <BAWSTi> That's what I'm asking, honestly I just assumed it would be possible with ffmpeg since it shows so much information about a file, why not the size then? : [15:03:38 CET] <J_Darnley> Because ffmpeg is far too big for such a simple use [15:03:56 CET] <J_Darnley> because the filesystem will tell you the size in much less time than ffmpeg [15:04:09 CET] <BAWSTi> There's an example of what it is @andrey_utkin https://github.com/WritingMinds/ffmpeg-android-java [15:04:23 CET] <BAWSTi> alright, thanks for the help anyway J_Darnley :) [15:07:32 CET] <J_Darnley> If you're programming, why the heck would you try and parse the output of some program? [15:07:42 CET] <J_Darnley> Surely there is a function you should be calling with a filename or some file object [15:10:10 CET] <andrey_utkin> J_Darnley, well, in the age of using jQuery for arithmetics... [15:17:10 CET] <wmp> J_Darnley, andrey_utkin, louiz: its possible with ffmpeg :D [15:17:12 CET] <wmp> ffmpeg -i upsy_krotkie.avi -filter_complex "[0:v] mpdecimate=hi=64*120:lo=64*30:frac=0.30 [a] ; [a] setpts='N/(25*TB)' [b] ; [b] fps=25 [c] ; [c] fps=25 [d]" -map "[d]" -c:v libx264 -f mp4 output_upsy_krotkietest.avi [15:17:46 CET] <J_Darnley> I'm glad you managed to get something your satisfied with [15:20:44 CET] <louiz> great [16:51:38 CET] <limbo_> If I have some mp3 files that are probably encodes at30kbps, what's the easiest/best way to re-encode them so I don't lose quality or increase filesize? [16:51:52 CET] <limbo_> It's about 7.1 GB of audio. [16:53:22 CET] <DHE> any re-encoding degrades the audio unless it's a lossless codec (eg: FLAC) [16:53:31 CET] <DHE> at 30 kilobits it probably sounds pretty bad already [16:56:53 CET] <zeryx> hey guys I have some questionable output from a splitting process I'm running [16:56:55 CET] <zeryx> Format mov,mp4,m4a,3gp,3g2,mj2 detected only with low score of 1, misdetection possible![mov,mp4,m4a,3gp,3g2,mj2 moov atom not found/tmp/vd/Hand_on_cereal_field.mp4: Invalid data found when processing input [16:57:10 CET] <zeryx> I'm recieving this error message and I'm unsure why [16:57:32 CET] <zeryx> when I run ffmpeg locally it doesn't complain, but when its run on my remote instance with the static ffmpeg binaries it fails; is this due to a missing library? [16:58:08 CET] <DHE> might be an old version that doesn't detect the file [16:58:18 CET] <DHE> or do you mean running remotely you're pointing at an HTTP url? [16:58:31 CET] <zeryx> running remotely as in on a remote server executing the code & returning an exception [16:58:36 CET] <zeryx> the file is the same [16:58:44 CET] <zeryx> (I'm handling everything myself in that respect) [16:58:54 CET] <zeryx> so you think it might be an older version of the binaries? [16:59:15 CET] <DHE> run it without parameters. there should be a date and version number you can use [17:02:01 CET] <zeryx> 2.8.5 [17:02:23 CET] <zeryx> https://gist.github.com/zeryx/3dbddc3dd1b6da69ee9e [17:04:06 CET] <limbo_> DHE: why does it degrade the quality? Is there something about mp3 compression that I'm missing? also, will ffmpeg pick a sane default based on the input if I don't give it a quality setting. [17:04:10 CET] <limbo_> ? [17:05:30 CET] <kepstin> limbo_: all lossless codecs have an issue with "generation loss" where each time you re-encode, you lose some quality. [17:05:35 CET] <kepstin> all lossy codecs* [17:05:42 CET] <kepstin> lossless ones don't have this issue, obviously [17:06:24 CET] <kepstin> limbo_: if you don't specify any quality setting, ffmpeg will use an arbitrary default that might not match what you want. You should almost always specify something. [17:08:42 CET] <limbo_> kepstin: I don't understand what causes that loss though. [17:09:13 CET] <kepstin> a lossy codec, when encoding, throws away some of the data to make the file smaller [17:09:30 CET] <kepstin> if you decode then reencode, it will throw away more data [17:15:11 CET] <zeryx> DHE I think it was actually just something output to the error stream [17:15:14 CET] <zeryx> that wasn't actually an error [17:15:34 CET] <zeryx> kinda dumb IMO [17:16:42 CET] <zeryx> nah still errors out remotely [17:16:44 CET] <zeryx> odd, works fine locally [17:16:53 CET] <zeryx> [mov,mp4,m4a,3gp,3g2,mj2 @ 0x4f87100] moov atom not found/tmp/vd/Hand_on_cereal_field.mp4: Invalid data found when processing input [17:17:47 CET] <kepstin> zeryx: compare your files to make sure they're actually the same? (e.g. sha1sum them both) [17:18:02 CET] <kepstin> moov atom not found is common if you have a non-streamable mp4 file that's missing the end [17:23:37 CET] <zeryx> gonna check that now, have to do it a bit roundabout since I have no direct access to the file [17:24:46 CET] <zeryx> hah [17:24:48 CET] <zeryx> the sum is different [17:24:50 CET] <zeryx> thats.. odd [17:37:27 CET] <zeryx> hah kepstin I figured it uot [17:37:56 CET] <zeryx> the download link I was being provided wasn't actually a file download, wget somehow is able to differentiate a true file from an http page describing a file [17:38:17 CET] <zeryx> but what I was using in my scala app wasn't able to do that, so it was downloading a borked file with a bunch of garbage in it [17:38:59 CET] <kepstin> zeryx: the link probably had a redirect, and your scala app was maybe using the contents of the redirect page rather than following the redirect? [17:44:00 CET] <zeryx> hmm still seems to be borked [17:44:45 CET] <zeryx> its still different sha1sums [17:45:36 CET] <zeryx> nah its that file specifically [17:45:47 CET] <zeryx> I have another file that I put in there myself in the same directory [17:45:49 CET] <zeryx> works fine [20:41:28 CET] <pomaranc> hi, does anyone know if there is hardware h264 decoding available for linux+nvidia? [20:41:50 CET] <c_14> vdpau [20:43:39 CET] <pomaranc> c_14: yes, but https://trac.ffmpeg.org/wiki/HWAccelIntro says it's deprecated [20:45:34 CET] <pomaranc> and looks like it cannot be used for transcoding [20:47:13 CET] <c_14> In that case, I don't know. [20:47:22 CET] <pomaranc> thanks anyway [20:48:37 CET] <DHE> vdpau is for playback, not decoding for software [20:52:48 CET] <DHE> also vdpau isn't deprecated [20:53:38 CET] <DHE> oh I see what you mean... [21:01:14 CET] <jkqxz> The standalone vdpau decoder is deprecated. The vdpau hwaccel decoder is not. For anything new, you should always use the latter. [21:07:59 CET] <kepstin> my impression was that you couldn't use vdpau outside of X tho, so it's not useful for "headless" transcoding. is that true? [21:09:40 CET] <DHE> that is correct. the decoded frame is only good for rendering on-screen and cannot be drawn back into RAM [21:12:23 CET] <jkqxz> Yes you can - it's not particularly fast to extract it, but it does work. (You can use "ffmpeg -hwaccel vdpau" for transcoding.) [21:13:16 CET] <jkqxz> What you can't do is anything useful with the surface itself other than send it to the screen - there is no hardware transcode path. [21:14:25 CET] <DHE> ah, okay. you have to do excessive pixel copying even to use NVENC [21:20:53 CET] <J_Darnley> Surprise! Using dedicated hardware a vast distance from the cpu and main memory is not very useful for general use. [21:39:03 CET] <lmat> What is the way to upload examples? [21:39:08 CET] <lmat> like audio files to share on irc? [21:41:52 CET] <lmat> found it! http://streams.videolan.org/upload/ [21:41:55 CET] <lmat> it wasn't ffmpeg, but videolan! [21:42:45 CET] <lmat> doh! It just ate my file :-( [22:03:15 CET] <somethingelse> Hi [22:04:20 CET] <somethingelse> I'm trying to build libav* statically via MSVC2015 on windows and link them into a program [22:04:40 CET] <somethingelse> I followed instructions and got the *.a files built (e.g. libavcodec.a) [22:06:03 CET] <somethingelse> http://stackoverflow.com/questions/2096519/from-mingw-static-library-a-to-vi... said I might be able to just use the .a's as .lib's [22:06:48 CET] <somethingelse> However, while MSVC didn't complain about the .a files I added to its list of libraries, it doesn't seem to be able to find any libav* symbols, either [22:07:03 CET] <somethingelse> Anyone has experience with this and knows what's up? [22:08:50 CET] <somethingelse> (libav* was built via the MSVC toolchain) [22:14:04 CET] <somethingelse> Oh wait [22:16:57 CET] <somethingelse> Of course [22:17:19 CET] <somethingelse> libav* needs extern "C" [22:18:27 CET] <somethingelse> (It might be unfair, but many c libraries include 'extern "C"' guraded by a C++ #ifdef just to avoid those headaches) [22:18:51 CET] <somethingelse> (Also, many c libraries don't expose structs as public apis) [22:19:16 CET] Action: somethingelse fades out [22:35:13 CET] <Lucifer333> hello [22:35:42 CET] <Lucifer333> maybe its wrong channel, but i have ripped some DVD's as files on disk (yes they are playable and YES I DID BUY THEM) [22:36:12 CET] <Lucifer333> does anyone have a DVD authering tool to edit, coalesce, cut out languages, etc [22:37:24 CET] <llogan> you can use ffmpeg to do some of what I think you may want to do with your DVDs (but not DVD's) [22:37:49 CET] <llogan> as long as the resulting files have been decrypted [22:38:06 CET] <Lucifer333> yes everything is decrypted [22:38:58 CET] <furq> Lucifer333: http://dvdauthor.sourceforge.net/ [22:39:01 CET] <kepstin> the '.vob' files are just mpeg-ps streams. it's as simple as concatenating all the split 1g files from the title you want, and you can use that as input directly to ffmpeg [22:39:16 CET] <furq> assuming you actually want to write it back to a playable dvd [22:39:19 CET] <furq> otherwise you can do everything with ffmpeg [22:39:35 CET] <furq> aside from cutting out individual pgcs ;_; [22:39:42 CET] <Lucifer333> no i dont, i want to convert to mp4 to make it playable on my ipad on the go [22:39:58 CET] <furq> well then you probably shouldn't ask for a dvd authoring tool [22:40:04 CET] <Lucifer333> I payed for the movie so i want to see it on my other devices [22:40:20 CET] <Lucifer333> well the dvd files as is are weird, and split up in weird chucks [22:40:27 CET] <Lucifer333> so they need to be "cleaned up" [22:41:02 CET] <kepstin> they're split up into 1gb chunks because of file size compatibility issues, i think. but you just have to find the ones that belong to the movie and concatenate them. [22:41:24 CET] <furq> if it's a tv show, or poorly-authored, then you might need to use a pgc demuxer such as pgcdemux [22:41:25 CET] <Lucifer333> I read somewhere DVD's are mpeg2 streams [22:41:50 CET] <Lucifer333> oh, the tool needs to be on linux, I dont run anything else [22:41:57 CET] <Lucifer333> pgcdemux, lemmi see [22:42:02 CET] <furq> pgcdemux is windows only afaik [22:42:13 CET] <Lucifer333> maybe i can run it in wine [22:42:18 CET] <llogan> see tools/dvdconcat [22:42:32 CET] <furq> Lucifer333: you might not need to use it [22:42:42 CET] <llogan> *dvd2concat [22:42:51 CET] <furq> it's useful for tv shows where the episodes don't map exactly to the vobs [22:42:54 CET] <kepstin> i wonder if the 'dvdunauthor' tool (included in the dvdauthor package) can do that [22:43:11 CET] <Lucifer333> wow so many tools, thanks for the pointers, [22:43:13 CET] <furq> other than that, the only thing ffmpeg won't do is preserve chapters [22:43:17 CET] <Lucifer333> I need to do some research [22:43:49 CET] <furq> http://dvdauthor.sourceforge.net/doc/dvdunauthor.html [22:43:50 CET] <furq> what a great manpage [22:44:51 CET] <kepstin> well, it has no bugs, that's good to know. [22:48:03 CET] <Lucifer333> http://dvdauthor.sourceforge.net/doc/index.html [22:48:05 CET] <Lucifer333> main page [22:48:21 CET] <furq> those are the dvd author docs [22:48:27 CET] <furq> i'm interested in dvdunauthor [22:49:30 CET] <kepstin> dvdunauthor basically takes a dvd image and turns it into a directory structure that could be used as input to dvdauthor [22:49:48 CET] <Lucifer333> ? [22:49:48 CET] <kepstin> I forget exactly what it preserves. [22:49:59 CET] <furq> http://sprunge.us/QVMN [22:50:04 CET] <furq> someone really doesn't want me to find out what this does [22:52:00 CET] <Lucifer333> do you know the CentOS repo [22:52:05 CET] <Lucifer333> so i can install with yum? [23:07:53 CET] <wirelesslinux> Hi, [23:08:24 CET] <wirelesslinux> I'm trying to use ffmpeg with H264 nvidia support [23:09:27 CET] <wirelesslinux> but when running ffmpeg, I block on error : dl_fn->cu_init(0) - failed with error code 0x3e7 [23:10:04 CET] <llogan> ...not that i have any experience with nvenc [23:10:12 CET] <wirelesslinux> Ok, sorry, first time for me on irc :) [23:13:14 CET] <wirelesslinux> http://pastebin.com/j5Z3T0yP [23:15:38 CET] <kepstin> wirelesslinux: that "modprobe: FATAL: Module nvidia-uvm not found." sounds suspicious. do you have the binary nvidia drivers installed and loaded? [23:16:36 CET] <wirelesslinux> How do I check it ? With lsmod | grep nvidia ? [23:20:44 CET] <wirelesslinux> http://pastebin.com/19cK09hh [23:21:20 CET] <wirelesslinux> And aptitude search uvm return an empty list. [23:28:37 CET] <kepstin> hmm. dvdunauthor does /not/ split up the pgcs by chapter, but it does write timestamps for them into the dvdauthor xml file, at least. [23:34:32 CET] <furq> yeah every tool i can find for this on *nix has been abandoned since 2004 [23:35:13 CET] <kepstin> i mean, you could probably write a shell script that interprets the ifo file and uses dd to extract a particular chapter or whatever :/ [23:35:44 CET] <kepstin> I can't remember if there was any work done on an input to ffmpeg using libdvdread or libdvdnav [23:36:20 CET] <furq> yeah it is odd that ffmpeg seemingly has no concept of ifo files [23:36:23 CET] <Plorkyeran> dvd things in general have been abandoned since 2004 [23:36:23 CET] <jookiyaya> how i tried 10 different players, only one support bluray java menu properly: why is this so difficult [23:36:53 CET] <Plorkyeran> they got to a working state and then have been bitrotting since [23:38:29 CET] <furq> i should see if i can hack something together with libdvdread [23:38:49 CET] <kepstin> jookiyaya: blurays in particular are very difficult [23:39:00 CET] <kepstin> the dvd vm for navigation is a lot simpler :/ [23:39:18 CET] <jookiyaya> if bluray uses java for menu, what does dvd use [23:39:22 CET] <kepstin> (dvdunauthor actually disasembles the nav vm instructions, which is kinda neat) [23:39:29 CET] <kepstin> jookiyaya: custom very simple bytecode [23:39:44 CET] <kepstin> and some still images and mpeg2 videos [23:40:11 CET] <c_14> furq: there's the ifo_palette option [23:40:15 CET] <c_14> or whatever it was called [23:42:14 CET] <kepstin> c_14: that's used for setting the colours when remuxing dvd image subtitles, but it's kind of a sidechannel hack, and obviously doesn't let you read e.g. video chapters and whatnot :) [23:43:00 CET] Action: c_14 wasn't really paying attention and his brain came up with the first result that seemed to match [23:44:31 CET] <limbo_> kepstin: but what about the way mp3 encodes makes it degrade quality? jpg doesn't have this problem. [23:44:40 CET] <furq> yes it does [23:44:44 CET] <kepstin> limbo_: jpg has the same problem, yes... [23:45:00 CET] <limbo_> no, it doesn't. [23:45:04 CET] <furq> the example on the wikipedia page for generation loss is a jpeg [23:45:09 CET] <furq> https://en.wikipedia.org/wiki/Generation_loss [23:45:16 CET] <kepstin> (you can do some modifications to jpeg - rotations, certain crops - without decoding and reencoding, but a full reencode will lose quality) [23:45:58 CET] <kepstin> i mean, if you're only doing it once or twice, you're probably not gonna notice [23:46:11 CET] <furq> you must not have a facebook account [23:46:56 CET] <furq> otherwise you'd see plenty of text screenshots of twitter feeds that have been reencoded by every viral image host on the internet before ending up on your decrepit uncle's wall [23:49:10 CET] <growery> hi [23:49:48 CET] <growery> how can i make ffmpeg hardware accelerated on a mac mini with osx el capitain? [23:51:28 CET] <limbo_> for i in {1..504} ; do ffmpeg -i $i.jpg $((i+1)).jpg; done [23:52:00 CET] <limbo_> I just did that on an imge to re-ecode it 505 times. I'm not seeing any quality loss after number 2. [23:52:30 CET] <limbo_> how many times do I have to do it to get quality loss [23:53:38 CET] <kepstin> limbo_: you might have just gotten lucky; if you re-encode with the exact same settings, it's possible that after a few generations it'll happen to pick the same encoding and give back the same result. [23:53:42 CET] <jkqxz> When you reencode with exactly the same parameters you may well get exactly the same result - in this case you converged to a fixed point very quickly. Try alternating JPEG and something else lossy instead. [23:54:13 CET] <kepstin> alternately, something like cropping a pixel off the top each time will certainly mess it up :) [23:54:32 CET] <limbo_> I know that, because I know how jpeg compression works. [23:55:26 CET] <limbo_> can anyone explain why mp3s might have compession that stops them from being re-encoded without change losslessly? [23:55:26 CET] <kepstin> limbo_: right - so in theory, if you re-encode a file with a the same lossy codec with exactly the same settings as it originally used, and the encoder is deterministic, you *might* get back the identical result. [23:55:46 CET] <kepstin> use a different encoder? all bets are off. [23:56:09 CET] <llogan> growery: FFmpeg has "OS X VideoToolbox support". whatever that is. might be worth a look. [23:56:24 CET] <kepstin> use something like x264 in multithreaded mode? well, then it's not deterministic, so no way :) [23:56:38 CET] <growery> llogan thanks i will search for it now [23:56:47 CET] <furq> limbo_: set -q:v [23:57:13 CET] <c_14> limbo_: because if you take a lossless source and encode it lossy and then decode it again you get something that isn't equivalent to your decoded original lossless source [23:57:27 CET] <c_14> Therefore if you encode the newly decoded content it will encode to something different [23:57:58 CET] <limbo_> but what about the codec used in mp3 makes that happen? [23:58:04 CET] <furq> limbo_: http://imgur.com/a/NVVKn [23:58:05 CET] <llogan> growery: also, this may be of slight interest to you: https://trac.ffmpeg.org/wiki/HWAccelIntro [23:58:10 CET] <furq> that's what i get after 500 passes with -q:v 90 [23:59:03 CET] <llogan> why 90? IIRC, max is 31 [23:59:04 CET] <c_14> limbo_: the mp3 encoder throws away data when it encodes [23:59:40 CET] <furq> because the max isn't documented anywhere i can find and everything else i've ever used for jpeg goes from 1-100 [23:59:47 CET] <c_14> As do all lossy encoders [23:59:50 CET] <llogan> furq: heh. Karnov. [00:00:00 CET] --- Sat Mar 12 2016