avcodec: Add FF_CODEC_CAP_INIT_CLEANUP
then ff_mpv_encode_end() will be unnecessary in ff_mpv_encode_init()
if it's failed.
The FF_CODEC_CAP_INIT_CLEANUP flag is need for single thread, For multithread,
it'll be cleanup still by AV_CODEC_CAP_FRAME_THREADS flag if have.
Signed-off-by:
Limin Wang <lance.lmwang@gmail.com>
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