id,summary,reporter,owner,description,type,status,priority,component,version,resolution,keywords,cc,blockedby,blocking,reproduced,analyzed
493,flash h.264 recorded files on FMS - bad duration and timing after ffmpeg conversion,kruzel,michael,"Hi,
I'm using ffmpeg to convert flash player 11 created h.264 file to ffmpeg format.
Its part of a larger functionality.

problem
-------
I'm running the following command:
ffmpeg -i 'host.mp4' -y -an -vcodec libx264 -b 1200k -r 25 -threads 0 -y 'singlevideoconvert.ts'

the original file is ~6 sec long.

after conversion, when playing, for example with ffplay, video playback is freezes for about 6 sec, then start playing, and after another 6 sec video freezes again, but ffplay seems to keep going endlessly.

another thing I see is that ffmpeg wrongly reports duration of 20 sec.
Mp4Box says it ~6 sec, which is correct.

I can provide files and logs.

ffmpeg dump info
-----------------
ofer@ofer-VirtualBox:~/Development/ffmpegtest/bug-example/test$ ffmpeg -v 9 -loglevel 99 -i host.mp4 
ffmpeg version N-32097-gee0ff05, Copyright (c) 2000-2011 the FFmpeg developers
  built on Sep 17 2011 21:16:19 with gcc 4.5.2
  configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab --enable-avfilter --enable-filter=movie --enable-librtmp --enable-libspeex
  libavutil    51. 13. 0 / 51. 13. 0
  libavcodec   53. 12. 0 / 53. 12. 0
  libavformat  53.  9. 0 / 53.  9. 0
  libavdevice  53.  3. 0 / 53.  3. 0
  libavfilter   2. 34. 2 /  2. 34. 2
  libswscale    2.  0. 0 /  2.  0. 0
  libpostproc  51.  2. 0 / 51.  2. 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x234e460] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x234e460] ISO: File Type Major Brand: f4v 
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x234e460] multiple edit list entries, a/v desync might occur, patch welcome
    Last message repeated 2 times
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x234e460] avformat_open_input() succeeded
[h264 @ 0x2351020] Unsupported bit depth: 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x234e460] flash hack - setting audion codec to speex
[libspeex @ 0x2353780] Missing Speex header, assuming defaults.
[h264 @ 0x2351020] Frame num gap 3 1
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x234e460] max_analyze_duration 5000000 reached at 5000000

Seems stream 0 codec frame rate differs from container frame rate: 48.00 (48/1) -> 24.00 (48/2)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'host.mp4':
  Metadata:
    major_brand     : f4v 
    minor_version   : 0
    compatible_brands: isommp42m4v 
    creation_time   : 2017-01-08 23:56:30
  Duration: 00:00:20.40, start: 0.000000, bitrate: 172 kb/s
    Stream #0.0(eng), 97, 1/1000: Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 1/48, 24 tbr, 1k tbn, 48 tbc
    Metadata:
      creation_time   : 2017-01-08 23:56:30
    Stream #0.1(eng), 252, 1/1000: Audio: speex (spex / 0x78657073), 16000 Hz, 1 channels, s16
    Metadata:
      creation_time   : 2017-01-08 23:56:30
    Stream #0.2(eng), 1, 1/1000: Data: none (amf0 / 0x30666D61)
    Metadata:
      creation_time   : 2017-01-08 23:56:30
At least one output file must be specified

Ofer
",enhancement,closed,minor,undetermined,git-master,fixed,mov edts,,,,1,0