Hi,

following patch series implements the suggestions in
https://bugzilla.libav.org/show_bug.cgi?id=10

I guesses since someone made the effort to report the bug it
would be nice to keep the functionality although the function 
is not used within Libav.

I have rudimentary test code for it. I'll extend it to a proper
fate test. I noticed something unexpected during testung. It
returns the first format without loss even if the source pixel
format is in the list/mask.

I'm not really sure that a good/expected behaviour would be:
 1) avoiding pixel format conversions if possible or
 2) handling the list as list of decreasing preference

I would prefer/expect 1) but would like to hear other opinions.

Janne
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