[FFmpeg-devel] ffplay: use AV_PKT_FLAG_DISPOSABLE in frame drop logic

[John Stebbins]

This update to the patch incorporates Marton's suggestion to eliminate
the effects of buffering on the selection of frames to drop.  It ties
the decision to start dropping disposable frames to the "early" frame
drop logic that happens immediately after avcodec_receive_frame.  And
disposable frames are dropped immediately before avcodec_send_packet.