[FFmpeg-user] remap filter gives only black and white output

[Paul B Mahol]

On 8/24/18, Shaji <shaji at stellaton.se> wrote:
> Hello,
>
> I am using the latest ffmpeg version. I am facing the same issue as
> discussed in the thread:
>
> https://ffmpeg.org/pipermail/ffmpeg-user/2017-November/037971.html
>
> That is remapping produce black and white output. If I use the workaround of
> using the format conversion then the processing slows down very drastically.
>
> One more thing to add is if I use yuv444p then the output is encoded
> coloured.
>
> Command producing black and white:
>
> Fps: 29
>
> ffmpeg -y -stream_loop -1 -i silence.mp3 -r 30 -i
> rtmp://172.104.245.86/live/test  -i sample2160_x.pgm -i sample2160_y.pgm
> -lavfi "remap" -vcodec h264_nvenc -pix_fmt yuv420p -b:v 10000k -f flv
> rtmp:xxxx
>
> Command producing colored output:
>
> Fps: 20
>
> ffmpeg -y -stream_loop -1 -i silence.mp3 -r 30 -i
> rtmp://172.104.245.86/live/test -i sample2160_x.pgm -i sample2160_y.pgm
> -lavfi "remap" -vcodec h264_nvenc -pix_fmt yuv444p -b:v 10000k -f flv
> rtmp:xxxx
>
> Fps: 12
>
> ffmpeg -y -stream_loop -1 -i silence.mp3 -r 30 -i
> rtmp://172.104.245.86/live/test  -i sample2160_x.pgm -i sample2160_y.pgm
> -lavfi " format=pix_fmts=rgb24,remap" -vcodec h264_nvenc -pix_fmt yuv420p
> -b:v 10000k -f flv rtmp:xxxxx
>
> Another interesting observation is that if I use ffmpeg version 3.3.2 then
> below mentioned command gives
> 20 fps with colored output
>
> ffmpeg -y -stream_loop -1 -i silence.mp3 -r 30 -i
> rtmp://172.104.245.86/live/test  -i sample2160_x.pgm -i sample2160_y.pgm
> -lavfi "remap" -vcodec h264_nvenc -pix_fmt yuv420p -b:v 10000k -f flv
> rtmp:xxxx
>
>
> Can you please tell me if this bug can be rectified as we want to achieve
> colored 29fps with this setup.

Nope, as non-colored uses less data for processing.