avfilter/avfiltergraph: Implement and use find_best_sample_fmt_of_2()
Similar to the pixel format code
Fixes Ticket3847
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Similar to the pixel format code
Fixes Ticket3847
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>