#ffmpeg on 2025-08-15 — 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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17:01 <scat117> ffmpeg .. -f x11grab .. -vf 'hwupload,scale_vaapi=format=nv12' -c:v h264_vaapi ..

17:01 <scat117> this produces a file with yuvj420p pixel format.

17:01 <scat117> trying to encode that file with libvpx-vp9 always produces a broken (non-decodable) stream.

17:01 <scat117> using `-pix_fmt` or `-vf format` doesn't seem to help.

17:01 <scat117> ffv1 encoder produces decodable but broken pixels (look wrong).

17:02 <scat117> vp9 is fixed if i decode to rawvideo first and save to a y4m file

17:02 <scat117> but nothing changes if i do that with ffv1.

17:03 <scat117> so currently, it's easy to create broken webms.

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17:30 <BtbN> Why do you encode with h264 first if your goal is vp9?

17:30 <BtbN> and yuvj420p is just a deprecated alias for yuv420p with jpeg color range

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17:33 <aruns> Hi, I've downloaded Kodi 21.2 on my FireStick and installed an add-on for it called InputStream Adaptive, but I still can't get MPEG-DASH streams to play. Anyone know how I can enable this? I've installed Kodi on my Fire Stick.

17:34 <microchip_> aruns: this is #ffmpeg, not #kodi

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17:37 <aruns> Sorry, thought it was worth a shot, considering that Kodi leverages ffmpeg in the backend.

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18:05 <aruns> I got it working btw.

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18:25 <scat117> <BtbN> Why do you encode with h264 first if your goal is vp9?

18:25 <scat117> potential use-case is quick real-time high-bitrate hardware encoding, then re-encoding at leisure.

18:25 <scat117> this is of course easily avoidable/worked-around if format=yuv420p is done before hwupload.

18:25 <scat117> BtbN: but in any case, ffmpeg shouldn't create broken files!

18:25 <BtbN> It's highly unlikely it does

18:26 <scat117> BtbN: wdym?

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18:36 <BtbN> Plenty of people use libvpx, including Google on YouTube

18:37 <BtbN> so if it was just flat out broken, someone would have long noticed

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19:11 <johnjaye> is webm actually a good format in terms of freedom and also function?

19:11 <johnjaye> someone told me they have a collection of videos in webm format

19:12 <johnjaye> my instinct was to suggest converting to mkv. but it says webm is based on mkv

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19:21 <kepstin> johnjaye: yeah, webm is essentially just a "profile" of mkv with the brand changed, and limitations on which codecs you're permitted to use.

19:25 <scat117> BtbN: i didn't mean libvpx itself is broken. i meant ffmpeg produces broken files in the specific scenario i described.

19:25 <scat117> you can try it yourself:

19:25 <scat117> ffmpeg .. -f x11grab -i :0 -t 3 -vf 'hwupload,scale_vaapi=format=nv12' -c:v h264_vaapi tn.mkv

19:25 <BtbN> yes, and I mean that that is highly unlikely.

19:26 <scat117> ffmpeg -i tn.mkv -c libvpx-vp9 tn.webm

19:26 <scat117> the container doesn't matter here.

19:26 <scat117> ffmpeg haapilly encodes a broken file which fails to decode with errors like:

19:26 <scat117> [ffmpeg/video] vp9: RGB not supported in profile 0

19:26 <scat117> [ffmpeg/video] vp9: Not all references are available

19:26 <BtbN> I have neither x11 nor vaapi available to me. And I also fail to see how the encoder would be relevant.

19:27 <BtbN> try decoding it with libvpx instead of the native decoder.

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19:27 <BtbN> Like it says, it probably plain does not support RGB in profile 0

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19:31 <scat117> <BtbN> try decoding it with libvpx instead of the native decoder.

19:31 <scat117> it errors too

19:31 <scat117> [ffmpeg/video] libvpx-vp9: Failed to decode frame: Bitstream not supported by this decoder

19:31 <scat117> [ffmpeg/video] libvpx-vp9: Failed to decode frame: Unspecified internal error

19:31 <scat117> the problem (i'm guessing) starts with picking yuvj420p for the the vaapi encode, when it should just be yuv420p.

19:32 <BtbN> well, the libvpx really did produce invalid bitstream, or at least one it doesn't support decoding itself

19:32 <BtbN> yuvj420p IS yuv420p.

19:32 <BtbN> It's just a deprecated format that encodes the color range in its nam

19:33 <scat117> BtbN: i mean the way ffmpeg is dealing with it is causing a problem. because putting format=yuv420p before hwupload fixes the issue.

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19:34 <BtbN> you're probably converting rgb to yuv by adding that, and rgb VP9 is what it says is broken

19:34 <BtbN> not sure why libvpx even lets you do that when it then can't decode it

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19:40 <scat117> BtbN: here is a sample vaapi encode

19:40 <scat117> https://files.catbox.moe/5krj84.mkv

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