Hello,
In H.264 and MPEG-1/2, the decoded pixel format can change mid-stream.
Yet, get_format() is only called if the new pixel format is compatible
with hardware acceleration. This triggers undefined behaviour in
hwaccel-enabled applications when hardware acceleration is first
enabled, and then the new pixel format changes to unaccelerated.
Forcing the callback to be called lets the application detect the
change and disable hardware acceleration cleanly.
(Note: The other get_format()-using codecs are not patched as they do
not seem to allow mid-stream change of the pixel format.)
--
Rémi Denis-Courmont
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