[FFmpeg-trac] #6402(avformat:new): First frames incorrect after seeking on H264 file

[FFmpeg]

#6402: First frames incorrect after seeking on H264 file
-------------------------------------+-------------------------------------
             Reporter:  jrummell     |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  mov          |               Blocked By:
  regression                         |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by dalecurtis):

 Cause of bad pts seems to be incorrect duration data:

 mov.c:6397      pkt->pts = pkt->dts + sc->dts_shift +
 sc->ctts_data[sc->ctts_index].duration;

 A good playback has the following values:
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f844b807200] pts calc dts:960960,
 dts_shift:0, duration:3003
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f844b807200] pts calc dts:963963,
 dts_shift:0, duration:9009
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f844b807200] pts calc dts:966966,
 dts_shift:0, duration:0
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f844b807200] pts calc dts:969969,
 dts_shift:0, duration:0
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f844b807200] pts calc dts:972972,
 dts_shift:0, duration:3003

 While a bad playback has:
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7faea000ca00] pts calc dts:960960,
 dts_shift:0, duration:3003
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7faea000ca00] pts calc dts:963963,
 dts_shift:0, duration:3003
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7faea000ca00] pts calc dts:966966,
 dts_shift:0, duration:3003
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7faea000ca00] pts calc dts:969969,
 dts_shift:0, duration:3003
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7faea000ca00] pts calc dts:972972,
 dts_shift:0, duration:3003

 Trying to see now why ctts_data has bad durations.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6402#comment:7>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker