#ffmpeg on 2025-07-30 — irc logs at libera.catirclogs.org

2025-03-03 01:06 ChanServ changed the topic of #ffmpeg to: Welcome to the FFmpeg USER support channel | Development channel: #ffmpeg-devel | Bug reports: https://ffmpeg.org/bugreports.html | Wiki: https://trac.ffmpeg.org/ | This channel is publically logged | FFmpeg 7.1.1 is released

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13:59 <^Neo> I have a ProRes asset in a MOV container and noticing a difference of behavior between 5.1.1 and 7.1.1 with respect to detecting the color transfer characteristics... in 5.1.1 the video stream reads as

13:59 <^Neo> Stream #0:0[0x1](eng): Video: prores (LT) (apcs / 0x73637061), yuv422p10le(tv, smpte170m/unknown/unknown, progressive), 768x432, 24468 kb/s, 30 fps, 30 tbr, 15360 tbn (default)

13:59 <^Neo> but in 7.1.1 it reads as

13:59 <^Neo> Stream #0:0[0x1](eng): Video: prores (LT) (apcs / 0x73637061), yuv422p10le(progressive), 768x432, 24468 kb/s, 30 fps, 30 tbr, 15360 tbn (default)

13:59 <^Neo> Wondering if anyone knows where the change happened and in what files I could go look at it?

14:01 <JEEB> `ffprobe -of json -show_streams -show_frames -select_streams v -i INPUT > streams_and_frames.json`

14:01 <JEEB> can you check the output of that?

14:02 <JEEB> there was a way to limit things to just the first frame, but I don't recall what it was so that might take a while

14:02 <^Neo> `-read_intervals "%+#1"`

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14:09 <^Neo> AVStream got rid of color information?

14:12 <JEEB> explain first what you now see with the new version regarding those two things

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14:13 <^Neo> 5.1.1

14:13 <^Neo> "streams": [

14:13 <^Neo> {

14:13 <^Neo> "index": 0,

14:13 <^Neo> "codec_name": "prores",

14:13 <^Neo> "codec_long_name": "Apple ProRes (iCodec Pro)",

14:13 <^Neo> "profile": "LT",

14:13 <^Neo> "codec_type": "video",

14:13 <^Neo> "codec_tag_string": "apcs",

14:13 <^Neo> "codec_tag": "0x73637061",

14:13 <^Neo> "width": 768,

14:13 <^Neo> "height": 432,

14:13 <^Neo> "coded_width": 768,

14:13 <^Neo> "coded_height": 432,

14:13 <^Neo> "closed_captions": 0,

14:13 <^Neo> "film_grain": 0,

14:14 <^Neo> "has_b_frames": 0,

14:14 <^Neo> "pix_fmt": "yuv422p10le",

14:14 <JEEB> please don't post long strings directly to IRC :P

14:14 <JEEB> utilize a pastebin site of choice, and link to it

14:14 <^Neo> ah ok

14:14 <^Neo> sorry

14:18 <^Neo> https://pastebin.com/S87g1KAt

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14:20 <JEEB> yea, so the matrix coefficients bit is there in the AVFrames, and ffmpeg cli does read it from the AVFrames when configuring output (I added that around 4.4)

14:21 <JEEB> I think there's a codecpar in AVStreams still, which does have the information if it's parsed at the correct moment

14:21 <^Neo> hmmm, ok

14:21 <^Neo> I'll continue digging

14:22 <JEEB> https://code.ffmpeg.org/FFmpeg/FFmpeg/src/commit/f09c834a7d01dfde9369551b2767c001846a396f/libavformat/avformat.h#L760-L769

14:22 <^Neo> codecpar is in AVStreams still, so it might be just that ffprobe.c got modified

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14:24 <JEEB> well it could be that previously more stuff was synchronized from decoder or its output to the AVStream's codecpar

14:24 <JEEB> now they might be more distinct, but really I don't recall what exactly was changed at this point almost a year ago

14:25 <JEEB> also you should test with current master if possible

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14:25 <^Neo> ah it's unknown in 7.1.1

14:26 <^Neo> that's why the json print isn't printing it I guess

14:28 <JEEB> I would not be surprised with that

14:28 <^Neo> > now they might be more distinct

14:28 <^Neo> was this done as part of the CLI threading aspect?

14:32 <JEEB> more distinct would mean that AVStream would contain closer to what's in the container, and frames what's in the actual contained video stream

14:32 <JEEB> but as I noted, I am not sure of this being the reason at all :P

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14:50 <JEEB> a more likely reason is that something like in-avformat probing was limited more strictly to when it is required. in general within MP4-likes (such as its originator QTFF aka MOV), you don't need to attempt to probe formats

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19:20 <MisterMinister> Greetings and Salutations! Have two audio tracks in SRT feed, sometimes more, sometimes less, sometimes 2.0, 4.0 or 5.1 channels. Any decent method to ID audio tracks in `ffmpeg -af astat` report please? https://pastes.io/ffmpeg-711-astats lines:3117-3128. Already am doing FFprobe, then `-filter_complex "[0:a:0]...[0:a:X]..."` and it works but is cumbersome, as each SRT init takes 4-5 sec.

19:20 <MisterMinister> Trying to use just an `-af astat..`, need to link astat multi chan report to audio track/channel ID/PID.

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