[FFmpeg-user] Clarification for decoding AV1 input on the GPU

[Mario Roy]

Greetings,

With the recent FFmpeg 5.1 supporting AV1 using VDPAU, should decoding AV1
occur on the GPU automatically (NVIDIA 3000 series), similarly to decoding
VP9?

ffmpeg -y -hwaccel vdpau -i input_av1.mp4 output.ts   # decodes on the CPU
ffmpeg -y -hwaccel vdpau -i input_vp9.webm output.ts  # decodes on the GPU

 Are the following incorrect usage? Both segfaults.

ffmpeg -y -hwaccel vdpau -c:v av1_cuvid -i input_av1.mp4 output.ts   # segfaults
ffmpeg -y -hwaccel vdpau -c:v vp9_cuvid -i input_vp9.webm output.ts  # segfaults

Thanks,
Mario

On Wed, Jul 13, 2022 at 9:44 AM Mario Roy <marioeroy at gmail.com> wrote:

> Hi,
>
> What are the recommended arguments for folks using NVIDIA 3000 series
> graphics and decoding AV1 media? I tried the same with VP9 media.
>
> The following was done using FFmpeg 5.1.
>
> ffmpeg -y -hwaccel vdpau -c:v av1_cuvid -i input_av1.mp4 output.ts   segfaults
> ffmpeg -y -hwaccel vdpau -c:v vp9_cuvid -i input_vp9.webm output.ts  segfaults
>
> ffmpeg -y -hwaccel vdpau -i input_av1.mp4 output.ts   decodes on the CPU
> ffmpeg -y -hwaccel vdpau -i input_vp9.webm output.ts  decodes on the GPU
>
> ffmpeg -y -hwaccel nvdec -c:v av1_cuvid -i input_av1.mp4 output.ts
> ffmpeg -y -hwaccel nvdec -c:v vp9_cuvid -i input_vp9.webm output.ts
>
> ffmpeg -y -c:v av1_cuvid -i input_av1.mp4 output.ts
> ffmpeg -y -c:v vp9_cuvid -i input_vp9.webm output.ts
>
> Best,
> Mario
>
>