[Cin] Set stream sample aspect ratio in ffmpeg.C

[Phyllis Smith]

Checked the result of these 3 patches into GIT just now.  I did delete the
line "printf("ofmt name %s \n", format_name);" as it seemed to be for
debugging only and we don't want to add any unnecessary information on the
startup window so important stuff does not get buried.


> Try this series instead, it guards setting stream sample aspect ratio
> only to muxers supporting it
>
>
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