[FFmpeg-trac] #2263(avformat:reopened): Read second SeekHead in Matroska files

FFmpeg trac at avcodec.org
Thu Oct 23 01:49:37 CEST 2014

#2263: Read second SeekHead in Matroska files
             Reporter:  eelco        |                    Owner:
                 Type:  enhancement  |                   Status:  reopened
             Priority:  wish         |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  mkv h264     |               Blocked By:
  bounty                             |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
Changes (by 11rcombs):

 * status:  closed => reopened
 * resolution:  fixed =>


 Not quite. {{{a3920181}}} is a partial fix that solves a more serious
 problem when {{{-copyts}}} or {{{-c copy}}} are used (wherein the seek
 operation previously would have no effect, and now proceeds somewhat
 slowly). I have a patch on the ML that fixes this slow-seeking issue
 caused by failure to read the second SeekHead, but it hasn't been applied
 yet because we need to double-check some edge cases first.
 Oh, and a3920181 may speed up seeking in these files, but not by as much
 as reading the second SeekHead would.

Ticket URL: <https://trac.ffmpeg.org/ticket/2263#comment:14>
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