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b9e4eefdb1
Might matter when libavformat tries to do tiny seekbacks in an unseekable stream, and the seekback buffer isn't large enough. In this case, seeking would fail, and would drop the current buffer. The seekback would end up dropping future data. This change probably doesn't have any observable effects. libavformat normally has its own stream buffer, and demux_mkv.c tries carefully never to seek back.