#ffmpeg on 2025-07-17 — 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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01:18 <carinobra> Hello. I'm trying to pipe down a MPEG Dash (.mpd manifest) that is encrypted with Widevine. I have KID and KEY information. How do I pass those keys to ffmpeg to decrypt the stream?

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01:23 <carinobra> Any help?

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12:26 <apteryx> sorry, for a ffplay command that crashes amdgpu, should the bug go to mesa, to ffmpeg, or both?

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12:36 <BtbN> If your driver crashes, that's automatically their bug

12:36 <BtbN> even if ffmpeg does something wrong, the driver shouldn't be crashing

12:38 <JEEB> aye

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12:39 <apteryx> I think it's this 2 yo one: https://gitlab.freedesktop.org/mesa/mesa/-/issues/?sort=created_date&state=opened&search=amdgpu+crash&search=ffmpeg&first_page_size=20&show=eyJpaWQiOiI3MDI2IiwiZnVsbF9wYXRoIjoibWVzYS9tZXNhIiwiaWQiOjU3NTYyfQ%3D%3D

12:39 <apteryx> I mean, this one: https://gitlab.freedesktop.org/mesa/mesa/-/issues/7026

12:39 <apteryx> they have the same reproducer, and the same result

12:40 <apteryx> well, slightly different; on my side I needed to enable vulkan support to trigger the amdgpu driver crash, otherwise ffmpeg would just segfault alone

12:40 <apteryx> maybe you'd like to know about the segfault, if I can reproduce that?

12:41 <JEEB> that's vaapi specific, while you're trying to utilize vulkan hwdec interfaces? (the backing hardware interfaces are the same, but two different APIs to access the same hardware)

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12:43 <apteryx> vulkan stuff seems to happen transparently, I'm specifying -hwaccel but I see a vulkan message about 'no derive for vulkan' or similar

12:43 <JEEB> well if you built with libplacebo then ffplay will be using libplacebo and most likely vulkan for rendering

12:43 <JEEB> that is separate from hwdec

12:46 <JEEB> also `ffmpeg -v verbose -noauto_conversion_filters -hwaccel vulkan -hwaccel_output_format vulkan -i INPUT -map 0:v:0 -f null pipe:` is how you can check how just plain decoding works

12:46 <JEEB> (I think that is the hwaccel and the output pix_fmt name)

12:49 <apteryx> yes I built with libplacebo

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13:06 <apteryx> the command you shared seems to happily decode a H264 video

13:08 <apteryx> this also appears to proceed without errors: $ ffmpeg -v verbose -noauto_conversion_filters -hwaccel vaapi -hwaccel_output_format vaapi -i ~/Downloads/test.mp4 -map 0:v:0 -f null pipe:

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13:16 <apteryx> here's the ffmpeg log I get when amdgpu crashes with `ffplay -hwaccel vaapi -i h264-test.mp4`: https://paste.centos.org/view/12813a8a

13:18 <apteryx> it briefly shows a black frame in the playback window, then crashes

13:18 <apteryx> (that is, amdgpu crashes)

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