[FFmpeg-user] Distinguish between muxer and demuxer optopms

[Eugene Dzhurinsky]

Hello!

The "loop" option is available for both image2pipe demuxer and gif muxer. I
want to change behavior of GIF muxer so if negative value is passed - then
GIF98a header is not written into GIF file. But this conflicts with demuxer
option and allowed value range (0 .. 1)

I have 2 choices - either add new option, or distinguish muxer/demuxer options
at command line - and this is the preferred way.

Please advice.

Thanks!

-- 
Eugene N Dzhurinsky
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