[Cin] Hwaccel FFV1 decoding and encoding

[Andrew Randrianasulu]

пн, 26 мая 2025 г., 04:55 Andrew Randrianasulu <randrianasulu at gmail.com>:

>
>
> вс, 25 мая 2025 г., 23:16 Terje J. Hanssen via Cin <
> cin at lists.cinelerra-gg.org>:
>
>> According to Phoronix 22 May 2025 :
>>
>>    - FFmpeg FFV1 Vulkan Encoder Lands +35% Improvement For AMD, +50% For
>>    NVIDIA
>>    - No word on Intel performance benefits from this Vulkan encode
>>    optimization.
>>
>>
>> AFAIK Intel has not yet QSV support for FFV1 either.
>>
>> Any idea which ffmpeg version release ffv1_vulkan will be available ?
>>
>
> I guess "upcoming", I saw references to 8.0 in commits.
>
>
> And which color bit depths will be supported: 8-bit yuv422p and 10-bit
>> yuv422p10le/ y210 ?
>> Speed tests?
>>
>
> Speed was not great for my rx550 (few fps for 4k video), but may be Arc
> actually faster for such workloads?
>
> I see at least those mentioned
> in ../thirdparty/ffmpeg.git/libavcodec/ffv1enc_vulkan.c
>
>     if (avctx->sw_pix_fmt == AV_PIX_FMT_GBRP10 ||
>                                 avctx->sw_pix_fmt == AV_PIX_FMT_GBRP12 ||
>         avctx->sw_pix_fmt == AV_PIX_FMT_GBRP14)
>
> so high-bit depth RGB is supported.
>
> I'll try to synthetize Vulkan ffv1 encoder preset and see what it offers.
>

Aw, it does not work, citing null pixel format not supported :)

Anyway, here is ffmpeg ticket about that:

https://trac.ffmpeg.org/ticket/11352
"On the state of FFmpeg's ffv1_vulkan encoder implementation on Intel &
NVIDIA"

for me it worked at like 0.6 fps for FHD (1920*1080) video but most
importantly both decoding AND encoding broken At The Moment for me on RX550

https://trac.ffmpeg.org/ticket/11609

In other words it does not error out, just decoded image is wrong (and not
in subtle way!) and encoded file not even playable by mpv/mplayer/cingg.




>
>>
>> Terje J. H
>>
>> --
>> Cin mailing list
>> Cin at lists.cinelerra-gg.org
>> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>>
>
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