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Hardware Accelerated Video Not Working

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max.ehr
max.ehr
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I'm not able to get hardware accelerated video decode working on Firefox developer 101.0b7 on Arch linux X11 with VA-API. This is verified by a lack of Video activity in intel-gpu-top

There is also no obvious error message. On youtube videos I sometimes see

[2022-05-16T17:36:32Z ERROR mp4parse] Found 2 nul bytes in "\u{0}\u{0}" [2022-05-16T17:36:32Z ERROR mp4parse] Found 2 nul bytes in "\u{0}\u{0}" [2022-05-16T17:36:32Z ERROR mp4parse] Found 2 nul bytes in "\u{0}\u{0}" [2022-05-16T17:36:32Z ERROR mp4parse] Found 2 nul bytes in "\u{0}\u{0}"

but on Big Buck Bunny from https://test-videos.co.uk/vids/bigbuckbunny/mp4/h264/1080/Big_Buck_Bunny_1080_10s_1MB.mp4 I don't get that output and everything looks normal:

libva info: VA-API version 1.14.0 libva info: Trying to open /usr/lib/dri/iHD_drv_video.so libva info: Found init function __vaDriverInit_1_14 libva info: va_openDriver() returns 0

but the video decode in intel-gpu-top shows 0%.

VA-API is confirmed to be working in mpv, if I play that same big buck bunny video in mpv I see 10-20% video decode usage.

vainfo shows

vainfo: VA-API version: 1.14 (libva 2.14.0) vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 22.4.1 () vainfo: Supported profile and entrypoints 

     VAProfileNone                   :	VAEntrypointVideoProc
     VAProfileNone                   :	VAEntrypointStats
     VAProfileMPEG2Simple            :	VAEntrypointVLD
     VAProfileMPEG2Simple            :	VAEntrypointEncSlice
     VAProfileMPEG2Main              :	VAEntrypointVLD
     VAProfileMPEG2Main              :	VAEntrypointEncSlice
     VAProfileH264Main               :	VAEntrypointVLD
     VAProfileH264Main               :	VAEntrypointEncSlice
     VAProfileH264Main               :	VAEntrypointFEI
     VAProfileH264Main               :	VAEntrypointEncSliceLP
     VAProfileH264High               :	VAEntrypointVLD
     VAProfileH264High               :	VAEntrypointEncSlice
     VAProfileH264High               :	VAEntrypointFEI
     VAProfileH264High               :	VAEntrypointEncSliceLP
     VAProfileVC1Simple              :	VAEntrypointVLD
     VAProfileVC1Main                :	VAEntrypointVLD
     VAProfileVC1Advanced            :	VAEntrypointVLD
     VAProfileJPEGBaseline           :	VAEntrypointVLD
     VAProfileJPEGBaseline           :	VAEntrypointEncPicture
     VAProfileH264ConstrainedBaseline:	VAEntrypointVLD
     VAProfileH264ConstrainedBaseline:	VAEntrypointEncSlice
     VAProfileH264ConstrainedBaseline:	VAEntrypointFEI
     VAProfileH264ConstrainedBaseline:	VAEntrypointEncSliceLP
     VAProfileVP8Version0_3          :	VAEntrypointVLD
     VAProfileVP8Version0_3          :	VAEntrypointEncSlice
     VAProfileHEVCMain               :	VAEntrypointVLD
     VAProfileHEVCMain               :	VAEntrypointEncSlice
     VAProfileHEVCMain               :	VAEntrypointFEI
     VAProfileHEVCMain10             :	VAEntrypointVLD
     VAProfileHEVCMain10             :	VAEntrypointEncSlice
     VAProfileVP9Profile0            :	VAEntrypointVLD
     VAProfileVP9Profile2            :	VAEntrypointVLD

As far as I know all flags are set properly (according to https://wiki.archlinux.org/title/firefox#Hardware_video_acceleration) and I have set MOZ_DISABLE_RDD_SANDBOX=1

I'm not able to get hardware accelerated video decode working on Firefox developer 101.0b7 on Arch linux X11 with VA-API. This is verified by a lack of Video activity in intel-gpu-top There is also no obvious error message. On youtube videos I sometimes see [2022-05-16T17:36:32Z ERROR mp4parse] Found 2 nul bytes in "\u{0}\u{0}" [2022-05-16T17:36:32Z ERROR mp4parse] Found 2 nul bytes in "\u{0}\u{0}" [2022-05-16T17:36:32Z ERROR mp4parse] Found 2 nul bytes in "\u{0}\u{0}" [2022-05-16T17:36:32Z ERROR mp4parse] Found 2 nul bytes in "\u{0}\u{0}" but on Big Buck Bunny from https://test-videos.co.uk/vids/bigbuckbunny/mp4/h264/1080/Big_Buck_Bunny_1080_10s_1MB.mp4 I don't get that output and everything looks normal: libva info: VA-API version 1.14.0 libva info: Trying to open /usr/lib/dri/iHD_drv_video.so libva info: Found init function __vaDriverInit_1_14 libva info: va_openDriver() returns 0 but the video decode in intel-gpu-top shows 0%. VA-API is confirmed to be working in mpv, if I play that same big buck bunny video in mpv I see 10-20% video decode usage. vainfo shows vainfo: VA-API version: 1.14 (libva 2.14.0) vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 22.4.1 () vainfo: Supported profile and entrypoints VAProfileNone : VAEntrypointVideoProc VAProfileNone : VAEntrypointStats VAProfileMPEG2Simple : VAEntrypointVLD VAProfileMPEG2Simple : VAEntrypointEncSlice VAProfileMPEG2Main : VAEntrypointVLD VAProfileMPEG2Main : VAEntrypointEncSlice VAProfileH264Main : VAEntrypointVLD VAProfileH264Main : VAEntrypointEncSlice VAProfileH264Main : VAEntrypointFEI VAProfileH264Main : VAEntrypointEncSliceLP VAProfileH264High : VAEntrypointVLD VAProfileH264High : VAEntrypointEncSlice VAProfileH264High : VAEntrypointFEI VAProfileH264High : VAEntrypointEncSliceLP VAProfileVC1Simple : VAEntrypointVLD VAProfileVC1Main : VAEntrypointVLD VAProfileVC1Advanced : VAEntrypointVLD VAProfileJPEGBaseline : VAEntrypointVLD VAProfileJPEGBaseline : VAEntrypointEncPicture VAProfileH264ConstrainedBaseline: VAEntrypointVLD VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice VAProfileH264ConstrainedBaseline: VAEntrypointFEI VAProfileH264ConstrainedBaseline: VAEntrypointEncSliceLP VAProfileVP8Version0_3 : VAEntrypointVLD VAProfileVP8Version0_3 : VAEntrypointEncSlice VAProfileHEVCMain : VAEntrypointVLD VAProfileHEVCMain : VAEntrypointEncSlice VAProfileHEVCMain : VAEntrypointFEI VAProfileHEVCMain10 : VAEntrypointVLD VAProfileHEVCMain10 : VAEntrypointEncSlice VAProfileVP9Profile0 : VAEntrypointVLD VAProfileVP9Profile2 : VAEntrypointVLD As far as I know all flags are set properly (according to https://wiki.archlinux.org/title/firefox#Hardware_video_acceleration) and I have set MOZ_DISABLE_RDD_SANDBOX=1