[00:56:54 CEST] <hiihiii> hello [00:57:09 CEST] <hiihiii> can I add chapter to an mp4? [00:59:22 CEST] <hiihiii> I've muxed a couple videos into one and I'd like to see chapter marks indicating the end and start of what was a single video [01:00:08 CEST] <furq> hiihiii: https://www.ffmpeg.org/ffmpeg-formats.html#Metadata-1 [01:03:57 CEST] <tezogmix> hey furq, remember the other day I was asking about that batch file with all those examples? Where do we put the "pause" line? [01:04:31 CEST] <hiihiii> furq: ahh that helpful [01:05:18 CEST] <hiihiii> but can I o it with the concat demuxer [01:05:36 CEST] <hiihiii> or do I have to manually edit the metadata to fit my needs [03:53:51 CEST] <GenN> According to FFmpeg help `ffmpeg -help encoder=h264_nvenc`, h264_nvenc supports RGB pixel format (bgr0 and rgb0). I try to encode to RGB, but the output is yuv420p. How to fix? See: https://thepasteb.in/p/wjhzcKwxzvVEAU6 [03:54:41 CEST] <GenN> NVIDIA GeForce GTX 1070, driver 382.33, Windows 10 1703 [03:55:26 CEST] <c3-Win> GenN: Did you look at the NVENC docs and confirm that NVidia supports encoding RGB h264? [03:57:32 CEST] <c3-Win> I can tell you that NVENC support receiving an RGB source, but it runs a shader on the GPU to convert it to YUV, and then encodes it... so I seriously doubt that NVENC supports outputting an RGB h264 file. [04:00:02 CEST] <GenN> Nv says a lot about RGB input but not output: https://www.developer.nvidia.com/nvenc-programming-guide [04:00:18 CEST] <GenN> So I guess there is no fix, for now [04:01:11 CEST] <c3-Win> More like there's nothing to fix. FFMPEG can't make NVidia grow new hardware parts. [04:05:51 CEST] <GenN> Thanks for your input. Bye [05:42:36 CEST] <Exairnous> durandal_1707: thanks for your help the other day [05:43:07 CEST] <Exairnous> furq: thanks for your help the other day [10:08:41 CEST] <nadermx> so no one? I posted the question on super user, but it seems I'm getting told it's not possible to add a picture to a mp3 with ffmpeg when making it go to stdout [10:08:48 CEST] <nadermx> https://superuser.com/q/1213776/535078 [10:21:25 CEST] <c_14> nadermx: the answer is probably right, someone would have to patch ffmpeg to write the id3 headers before writing the mp3 [12:00:43 CEST] <Sanqui> hi, I'm trying to convert a series of pngs into a video with the following command: `ffmpeg -framerate 1 -i %d.png output.mp4` [12:01:18 CEST] <Mavrik> yay. [12:01:26 CEST] <Sanqui> each png is at most 5MB but I run out of 8gb of memory quickly. does ffmpeg try to load them into memory all at once or something? [12:02:28 CEST] <JEEB> Sanqui: you're not rescaling so there are multiple buffers kept in x264 [12:02:40 CEST] <JEEB> since it optimizes the encoding for compression [12:02:58 CEST] <Mavrik> Also, "at most 5MB" doesn't actually tell anything about how big those PNGs are when decompressed :) [12:03:48 CEST] <JEEB> yea [12:03:53 CEST] <JEEB> but probably pretty big :P [12:03:54 CEST] <Sanqui> sure, they're pretty huge (about 5k pixels). maybe I should rescale then [12:04:11 CEST] <JEEB> -vf zscale=w=blah:h=blah [12:04:13 CEST] <Mavrik> Yeah, 5K videos probably won't play well :) [12:04:16 CEST] <JEEB> after -i [12:05:10 CEST] <Sanqui> JEEB: no such ffilter zscale, but I did -vf scale=1280:720 and that seems to run much better haha [12:05:26 CEST] <JEEB> right, you have to build FFmpeg with zimg [12:05:29 CEST] <JEEB> for zscale [12:05:44 CEST] <JEEB> zimg being a high-quality scaling library [12:05:52 CEST] <JEEB> https://github.com/sekrit-twc/zimg [12:06:51 CEST] <Sanqui> neat, thanks! [12:08:56 CEST] <atomnuker> JEEB: asking someone to use zscale and recompile for casual encoding changing colorspaces is overkill [12:09:23 CEST] <JEEB> sure [12:09:32 CEST] <atomnuker> its more overkill than asking them to use the colorspace filter to convert (and get correct results) [12:09:34 CEST] <JEEB> he found the normal scale filter himself rather well :) [12:09:58 CEST] <JEEB> well, in this case it wasn't just colorspace that was needed :3 [12:10:26 CEST] <Sanqui> I was just a bit dumb thinking I wouldn't bother with resizing ("youtube will do it for me" XD) [12:11:17 CEST] <JEEB> well a 64bit binary would have happily used that RAM and finished. would have used quite a bit more time though since there's a lot more of image to encode [12:11:27 CEST] <JEEB> (as long as you had enough RAM) [13:07:14 CEST] <formruga> Hi. Is a way to "attach" PCR to audio packet not to video packet? My video has a low framerate (1/5) and PCRs are every 5 seconds. [15:11:02 CEST] <DHE> if I understand this right, the purpose of av_interleaved_write_frame() is so that audio and video streams will have their packets reordered so that they are written in sync to each other. Like merge-sorting each stream together before submitting to av_write_frame(). Am I right? [15:11:11 CEST] <DHE> I ask because it doesn't seem to be doing that [17:38:40 CEST] <jokkker87> hi everyone, i'm trying to cut an mpeg-ps into pieces for dvd authoring [17:39:17 CEST] <jokkker87> i'm using dvdauthor, which as actually a problem, if the pts of the video and audio are too far apart [17:39:24 CEST] <jokkker87> *has actually [17:41:01 CEST] <jokkker87> i know that i get the delay because of the different fps of the video (which is 25FPS) and audio (which is 31.250FPS) [17:42:05 CEST] <jokkker87> so i'm able to produce a working dvd with dvdauthor by trying a range of 4 seconds for the split (4 * 6.25) [17:43:07 CEST] <jokkker87> this is my command to ffmpeg: [17:43:16 CEST] <jokkker87> ffmpeg.exe -ss 02:42:27 -i .\video.mpg -ss 00:01:00 -t 00:17:23 -target pal-dvd -codec copy result.mpg [17:45:25 CEST] <jokkker87> is there a parameter for ffmpeg to tell it, that the delay between audio and video should not exceed a given limit? [19:53:14 CEST] <Mista-D> what [19:53:50 CEST] <Mista-D> 's mpeg-ts/udp codec with alpha channel support please? [20:17:10 CEST] <ChocolateArmpits> Mista-D, what about jpeg2000 ? [20:18:24 CEST] <Mista-D> probbaly woudl work, definetly PNG, but was hoping ofr a little higher efficinecy video codec. [20:19:48 CEST] <ChocolateArmpits> You'd had to supply the alpha channel as a separate video track and then combine that with the color video at the end [20:21:18 CEST] <furq> Mista-D: vp8 [20:21:44 CEST] <ChocolateArmpits> furq, not supported in mpegts [20:21:56 CEST] <furq> i just tried it and ffmpeg will mux it [20:22:01 CEST] <ChocolateArmpits> hummm [20:22:10 CEST] <furq> what a player will make of it i don't know [20:22:18 CEST] <Mista-D> A unique mpegts stream (: [20:22:23 CEST] <furq> i can't think of anything else though [20:22:42 CEST] <furq> also you're stuck with yuva420p if you do that, no 444 or rgba [20:22:43 CEST] <Mista-D> Thanks [20:23:36 CEST] <ChocolateArmpits> actually if you want to do pure udp streaming you just use the rawvideo format, -f rawvideo udp:// [20:23:46 CEST] <ChocolateArmpits> But the bandwith expense will be enormous [20:23:54 CEST] <furq> yeah that's not going to work over wan or wifi [20:23:59 CEST] <furq> or probably 100mbit, for that matter [21:14:47 CEST] <nadermx> @c_14 could you maybe point me in the right direction as to where in the source I could look into possibly trying to either make a patch myself or find some one who can? [22:04:34 CEST] <DHE> Is there a way to force audio and video sync inside a container? av_interleaved_write_frame() isn't writing in order of global dts [22:16:21 CEST] <Mavrik> It should O.o [22:18:21 CEST] <DHE> if I set "-c copy" it does, but if I set "-c:a aac -c:v libx264 [codecoptions]" it doesn't. [22:18:45 CEST] <DHE> to clarify I'm using the ffmpeg CLI tool, but looking at what's wrong from an API standpoint because I had the same issue with the API as well [00:00:00 CEST] --- Tue May 30 2017