id	summary	reporter	owner	description	type	status	priority	component	version	resolution	keywords	cc	blockedby	blocking	reproduced	analyzed
2037	Heavy A/V desync on transcoding	ramitbhalla		"Summary of the bug: I have a lot of file (mostly DVRMS and TS) where FFMPEG is not able to get the correct frame rate. I'm attaching one such example which I've created using a binary cutter.

As you can see it's reporting a rate of 25.58 where as MediaInfo is able to correctly determine the frame rate of ALL media files I provide it (in this case it showed 25).

Any idea why ffmpeg is not able to determine the frame rate? This is creating a problem since while converting to mp4 the audio is slowly going of out sync with the video (upto 5 seconds after about an hour of recording).

How to reproduce:
{{{
ffmpeg.239-current.exe -i ""Test DVRMS.dvr-ms""
ffmpeg version N-46726-g2f74f8d Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov 13 2012 19:29:51 with gcc 4.7.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-pthreads --enable-runtime-cpudetect --enable-avisynth --enable
-bzlib --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enab
le-libgsm --enable-libmp3lame --enable-libnut --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroed
inger --enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-li
bvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52.  6.100 / 52.  6.100
  libavcodec     54. 71.100 / 54. 71.100
  libavformat    54. 36.100 / 54. 36.100
  libavdevice    54.  3.100 / 54.  3.100
  libavfilter     3. 23.100 /  3. 23.100
  libswscale      2.  1.102 /  2.  1.102
  libswresample   0. 16.100 /  0. 16.100
  libpostproc    52.  1.100 / 52.  1.100
[mpeg2video @ 03489b20] interlaced frame in progressive sequence, ignoring
[mpeg2video @ 03489b20] invalid frame_pred_frame_dct
[mpeg2video @ 03489b20] slice below image (30 >= 30)
[asf @ 002cae40] Estimating duration from bitrate, this may be inaccurate
Input #0, asf, from 'Test DVRMS.dvr-ms':
  Metadata:
    DVR Index Granularity: 500
    WM/SubTitle     : Ch 9, 6:00 PM
    WM/SubTitleDescription: Nine Digital 6:00 PM
    WM/OriginalReleaseTime: 0001-01-01T00:00:00Z
    service_provider: Nine Digital
    service_name    : Nine Digital
    WM/MediaOriginalChannel: 9
    WM/MediaOriginalBroadcastDateTime: 0001-01-01T00:00:00Z
    WM/WMRVServiceID: 191625:4114:1056:1057
    WM/WMRVProgramID: None
    WM/MediaOriginalRunTime: 8201308
    WM/WMRVEncodeTime: 1844674
    WM/MediaIsStereo: 0
    WM/VideoClosedCaptioning: 0
    WM/MediaIsRepeat: 0
    WM/MediaIsLive  : 0
    WM/MediaIsTape  : 0
    WM/MediaIsDelay : 0
    WM/MediaIsSubtitled: 0
    WM/MediaIsMovie : 0
    WM/MediaIsPremiere: 0
    WM/MediaIsFinale: 0
    WM/MediaIsSAP   : 0
    WM/WMRVRequestID: 645
    WM/WMRVScheduleItemID: 656
    WM/WMRVQuality  : 3
    WM/WMRVOriginalSoftPrePadding: 0
    WM/WMRVOriginalSoftPostPadding: 0
    WM/WMRVActualSoftPrePadding: 0
    WM/WMRVHardPrePadding: 0
    WM/WMRVEndTime  : 2579709
    WM/WMRVExpirationDate: 1844674
    WM/WMRVBitrate  : 0
    WM/WMRVKeepUntil: 184
    WM/WMRVHardPostPadding: 0
    WM/WMRVActualSoftPostPadding: 0
    WM/WMRVContentProtectedPercent: 0
    WM/WMRVInBandRatingSystem: 255
    WM/WMRVInBandRatingLevel: 255
    WM/WMRVInBandRatingAttributes: 0
    WM/WMRVWatched  : 0
    WM/WMRVATSCContent: 0
    WM/WMRVDTVContent: 1
    WM/WMRVHDContent: 0
    WM/WMRVContentProtected: 0
    WM/MediaThumbTimeStamp: 1844674
    WM/MediaThumbWidth: 360
    WM/MediaThumbHeight: 288
    WM/MediaThumbStride: 108
    WM/MediaThumbRet: 0
    WM/MediaThumbType: 3
    WM/MediaThumbRatingSystem: 255
    WM/MediaThumbRatingLevel: 255
    WM/MediaThumbRatingAttributes: 0
    WM/MediaThumbAspectRatioX: 16
    WM/MediaThumbAspectRatioY: 9
    WMFSDKVersion   : 11.0.6001.7000
    WMFSDKNeeded    : 0.0.0.0000
    VBR Peak        : 159
    IsVBR           : 1
    title           : Manual Recording
  Duration: 00:00:01.62, start: 37.280000, bitrate: 10356 kb/s
    Stream #0:0: Video: mjpeg, yuvj420p, 200x200 [SAR 96:96 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
    Metadata:
      title           : TV Thumbnail
      comment         : Movie/video screen capture
    Stream #0:1: Audio: mp2, 48000 Hz, stereo, s16, 256 kb/s
    Stream #0:2: Video: mpeg2video (DVR  / 0x20525644), yuv420p, 704x480 [SAR 64:45 DAR 1408:675], 12000 kb/s, 25.58 fps
, 25 tbr, 1k tbn, 50 tbc
At least one output file must be specified
}}}
"	defect	closed	normal	undetermined	git-master	fixed	asf mpegts mpeg2video				1	0