[MPlayer-dev-eng] [PATCH] fix vo_png

[Ivan Kalvachev]

After merging libav changes, ffmpeg no longer works with vo_png.

The problem is that avcodec_open2() function now wants a valid pix_fmt
to be set in avctx, but the current vo_png opens the encoder in
preinit() function, long before the exact pixel format
(RGB8/15/16/24/32) is known.

To fix this I've moved the avcodec_open2() function to
vo_png::config() and added a check for changed pixel format in case of
second call to config() without uninit() (this is valid behavior).


Please check the patch, I want to commit it soon.
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