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

[Shaji stellaton]

Hello

So, I believe I will have to revert to version 3.3.2

Can we force the filter to speed up? I observe that the remap filter is just using one core to 100% and all the other cores are free. I tried 'threads 16' and 'filter_complex_threads 16' Options but it did not make any difference.

Thank you.

Best regards,
Shaji Baig

Sent from my iPhone

> On 24 Aug 2018, at 16:48, Paul B Mahol <onemda at gmail.com> wrote:
> 
>> 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.
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