[FFmpeg-user] slow encoding from raw rgb

[Paul B Mahol]

On 10/18/18, Daniel Oberhoff <danieloberhoff at googlemail.com> wrote:
> Hello,
>
>
> So we are trying to encode raw rgb data from a pipe with ffmpeg. We
> found that ffmpeg implicitly converts the data to tv range bt601, which
> is suboptimal. Especially tv range loses more information than
> neccessary, also bt709 seems to be the better color space.
>
>
> We know we can fix this by adding -vf
> scale=out_color_matrix=bt709:out_range=pc. Unfortuntately thi makes
> encoding a lot slower (40 vs 60 fps) which effectively makes this
> approach too slow for us. Do yiz have any idea why this is the case?

That approach does not use slice threading.