[FFmpeg-devel] [PATCH v2 2/2] avfilter: add vf_overlay_cuda

[Timo Rothenpieler]

On 19.03.2020 14:35, Yaroslav Pogrebnyak wrote:
> Oh, I didn't noticed that h264_cuvid is legacy.
> 
> It seems the problem in this line:
> 
> ret = av_frame_make_writable(input_main);
> 
> If removed, it starts to work with -hwaccel cuda.
> 
> I'll take a closed look why and what happens but any advice would be 
> helpful. Thanks!

For what I'm aware, make_writable does not work on hardware frames.
And the nvdec hwaccel returns frames that are mapped device memory, and 
thus hard read-only.

You will need to manually allocate output frames from the hw_frames_ctx.