[FFmpeg-trac] #1621(undetermined:new): Converted flash video has longer duration than the source

[FFmpeg]

#1621: Converted flash video has longer duration than the source
-------------------------------------+-------------------------------------
             Reporter:  agowad       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 ### WHAT
 I am trying to convert a video to flv format maintaining its (almost exact
 = less than 0,5s) duration.

 ### THE PROBLEM
 Generated flash is longer than the input file.
 Input file duration: 00:01:46.02
 Output file duration: 00:01:47.24
 I can make the difference smaller by reducing -ar 44100 to 11025, but
 still it is larger than 0,5s (which is much for me).

 ### COMMAND LINE
 ffmpeg.exe -i "Dolphins_720.wmv"  -vf
 "scale=500:281,pad=500:500:0:109,setdar=500:500"  -y -b:v 1000k -r 23.98
 -ar 44100  -ab 384 -acodec libmp3lame -ac 2 "Dolphins_7202_TMP.flv"

 ### THE INPUT FILE
 ffmpeg version N-43206-gf857465 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Aug  4 2012 16:10:39 with gcc 4.7.1 (GCC)
   configuration: --enable-gpl --enable-version3 --disable-w32threads
 --enable-ru
 ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-
 libass
  --enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable
 -libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-
 libope
 njpeg --enable-librtmp --enable-libschroedinger --enable-libspeex
 --enable-libth
 eora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc
 --enable-
 libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-
 libxvid --e
 nable-zlib
   libavutil      51. 66.100 / 51. 66.100
   libavcodec     54. 49.100 / 54. 49.100
   libavformat    54. 22.100 / 54. 22.100
   libavdevice    54.  2.100 / 54.  2.100
   libavfilter     3.  5.102 /  3.  5.102
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 15.100 /  0. 15.100
   libpostproc    52.  0.100 / 52.  0.100
 [asf @ 01f37a20] Format asf probed with size=2048 and score=100
 [asf @ 01f37a20] gpos mismatch our pos=24, end=26
 [asf @ 01f37a20] gpos mismatch our pos=24, end=1042
 [asf @ 01f37a20] gpos mismatch our pos=24, end=38
 [asf @ 01f37a20] gpos mismatch our pos=24, end=314
 [asf @ 01f37a20] gpos mismatch our pos=24, end=38
 [asf @ 01f37a20] File position before avformat_find_stream_info() is 2856
 [asf @ 01f37a20] parser not found for codec wmapro, packets or times may
 be inva
 lid.
 [wmv3 @ 01f3e100] Header: 4BF10A01
 [wmv3 @ 01f3e100] Profile 1:
 frmrtq_postproc=5, bitrtq_postproc=31
 LoopFilter=0, MultiRes=0, FastUVMC=0, Extended MV=0
 Rangered=0, VSTransform=1, Overlap=1, SyncMarker=0
 DQuant=0, Quantizer mode=0, Max B frames=0
 [asf @ 01f37a20] parser not found for codec wmapro, packets or times may
 be inva
 lid.
 [asf @ 01f37a20] All info found
 rfps: 23.750000 0.011882
 rfps: 23.833333 0.004763
 rfps: 23.916667 0.000862
     Last message repeated 1 times
 rfps: 24.000000 0.000182
     Last message repeated 1 times
 rfps: 24.083333 0.002721
     Last message repeated 1 times
 rfps: 24.166667 0.008479
     Last message repeated 1 times
 rfps: 24.250000 0.017456
 rfps: 47.666667 0.019050
 rfps: 47.750000 0.009640
 rfps: 47.833333 0.003450
     Last message repeated 1 times
 rfps: 47.916667 0.000479
     Last message repeated 1 times
 rfps: 48.000000 0.000727
     Last message repeated 1 times
 rfps: 48.083333 0.004195
     Last message repeated 1 times
 rfps: 48.166667 0.010882
 rfps: 23.976024 0.000048
     Last message repeated 1 times
 rfps: 47.952048 0.000191
     Last message repeated 1 times
 [asf @ 01f37a20] File position after avformat_find_stream_info() is
 1427237
 Input #0, asf, from 'Dolphins_720.wmv':
   Metadata:
     WMFSDKVersion   : 9.00.00.2980
     WMFSDKNeeded    : 0.0.0.0000
     IsVBR           : 0
   Duration: 00:01:46.02, start: 0.000000, bitrate: 6576 kb/s
     Stream #0:0(eng), 11, 1/1000: Audio: wmapro (b[1][0][0] / 0x0162),
 48000 Hz,
  5.1, flt, 384 kb/s
     Stream #0:1(eng), 41, 1/1000: Video: wmv3 (Main) (WMV3 / 0x33564D57),
 yuv420
 p, 1280x720, 1/1000, 6000 kb/s, 23.98 tbr, 1k tbn, 1k tbc
 At least one output file must be specified
 [AVIOContext @ 01f3ff60] Statistics: 1441792 bytes read, 0 seeks

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1621>
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