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Some callers (like do_subtitle_out(), or do_streamcopy()) call this with an AVPacket that is not refcounted. This can cause undefined behavior. Calling av_packet_move_ref() does not make a packet refcounted if it isn't yet. (And it can't be made to, because it always succeeds, and can't return ENOMEM.) Call av_packet_ref() instead to make sure it's refcounted. Cc: libav-stable@libav.org Signed-off-by: Martin Storsjö <martin@martin.st>