[FFmpeg-devel] [PATCH] libavformat: libavformat: output cues for each subtitle block in MKV muxer

[John Peebles]

If you use ffmpeg to remux an mkv file and the file has ASS subtitles, only
the first subtitle with a given timecode will be added to the list of cues.

This is caused by two issues:
(1) the MKV muxer only writes one cue per AVPacket, but ASS subtitles may
have multiple blocks corresponding to one AVPacket.
(2) The MKV muxer only writes a cue for the first block in a track with a
given timecode. For subtitles, multiple blocks may have the same timecode.

This patch fixes these issues by always writing one cue per block for
subtitle tracks, even if multiple blocks have the same timecode.
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