[FFmpeg-trac] #259(undetermined:new): framerate detection does not work properly.

[FFmpeg]

#259: framerate detection does not work properly.
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Reporter:  mbosner                    |       Owner:
    Type:  defect                     |      Status:  new
Priority:  normal                     |   Component:  undetermined
 Version:  unspecified                |  Resolution:
Keywords:  false framerate detection  |  Blocked By:
Blocking:                             |  Reproduced:  0
Analyzed:  0                          |
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Comment (by mbosner):

 The sample file is ofc just the first 10 MB of 17 GB. If you need more
 please tell me.

 Maybe i should explain what i am doing:
 I try to batch convert video files using some script code that i wrote.
 Normaly everything works fine or i can workaround problems. But with this
 file ffmpeg guesses the wrong frame rate and i convert the file from 24fps
 to ~29.97fps which lead to stutter movie playback. Audio and Video is in
 sync. But since i detect the wrong fps with ffmpeg -i i convert it to the
 wrong framerate:

 I am getting informations about the file using ffmpeg:
 ffmpeg -i "temporary_filename000.mkv" 2>&1
 FFMPEG OUT: ffmpeg version git-N-30444-geb5a3ab, Copyright (c) 2000-2011
 the FFmpeg developers
 FFMPEG OUT:   built on Jun  1 2011 16:42:49 with gcc 4.5.2
 FFMPEG OUT:   configuration: --enable-gpl --enable-version3 --enable-
 nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-
 libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-
 libvorbis --enable-libx264 --enable-libxvid
 FFMPEG OUT:   libavutil    51.  3. 0 / 51.  3. 0
 FFMPEG OUT:   libavcodec   53.  6. 1 / 53.  6. 1
 FFMPEG OUT:   libavformat  53.  2. 0 / 53.  2. 0
 FFMPEG OUT:   libavdevice  53.  1. 0 / 53.  1. 0
 FFMPEG OUT:   libavfilter   2. 11. 0 /  2. 11. 0
 FFMPEG OUT:   libswscale    0. 14. 0 /  0. 14. 0
 FFMPEG OUT:   libpostproc  51.  2. 0 / 51.  2. 0
 FFMPEG OUT: [matroska,webm @ 0x23c5420] Estimating duration from bitrate,
 this may be inaccurate
 FFMPEG OUT: Input #0, matroska,webm, from 'temporary_filename000.mkv':
 FFMPEG OUT:   Duration: 01:47:42.18, start: 0.000000, bitrate: 1984 kb/s
 FFMPEG OUT:     Stream #0.0: Video: vc1 (Advanced), yuv420p, 1920x1080
 [PAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 1k tbn, 29.97 tbc (default)
 FFMPEG OUT:     Stream #0.1: Audio: eac3, 48000 Hz, 5.1, s16, 1536 kb/s
 (default)
 FFMPEG OUT:     Stream #0.2: Audio: eac3, 48000 Hz, 5.1, s16, 448 kb/s
 FFMPEG OUT: At least one output file must be specified


 i extract the audio(...)

 and i convert the video:
 ffmpeg -i 'temporary_filename000.mkv' -flags ilme -an -pix_fmt yuv420p -f
 rawvideo -vcodec rawvideo -| x264  --preset veryslow --fps 29.970 --crf 18
 -o track1.mp4 - --input-res 1920x1080

 i can playback the original file without problems using xbmc. I am not
 sure if this is the only file with the problem but it is the first one
 where i noticed the problem.

-- 
Ticket URL: <https://avcodec.org/trac/ffmpeg/ticket/259#comment:3>
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