[FFmpeg-user] Trouble using -ss -t with dvcpro50 files

Shlomo Morosow shlomorosow at gmail.com
Tue Mar 18 21:45:25 CET 2014

Recently I've been encountering a strange problem which I don't seem to
find any info online regarding anything similar, unless of course I'm using
the wrong keywords while googling it (probably the case). I hope that
perhaps someone here can shed some light on the matter:

With a particular file(type) which is dvcpro50 contained within an avi,
when I use any syntax (that otherwise works flawlessly on the given file)
with the added parameters of -ss and -t it won't export anything but the
audio unless I've set the -ss to anywhere in the first few minutes of the
video which then it works fine.

Further, I've set ffplay to play using the same parameters as for
converting video and it has identical results: it won't seek to the
referenced frame yet it can play the same file from the beginning or with
an -ss set to somewhere in the first few minutes.

Here's an example, but keep in mind I've tried this with many output
formats and they all work fine until the time is entered (anywhere past the
first few minutes)
ffmpeg.exe -y  -ss 0:10:35.700 -i input.AVI -t 0:02:35.600 -map 0 -c copy

I've attached a .txt file with what I get from ffmpeg when trying the above

I've been having this issue with multiple files and they're all of the same
codec (dvcpro50) and I don't seem to have it on any other file types.
Perhaps be something unique to this codec.

I hope someone can help me with this, Thanks
-------------- next part --------------

C:\FFMPEG\bin>ffmpeg.exe -y  -ss "0:10:35.700" -i input.AVI -t "0:02:35.600" -ma
p 0 -c copy "export.mov"
ffmpeg version N-52045-g694fa00 Copyright (c) 2000-2013 the FFmpeg developers
  built on Apr 12 2013 16:54:51 with gcc 4.8.0 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrn
b --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libr
tmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheo
ra --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-li
bvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --ena
  libavutil      52. 26.100 / 52. 26.100
  libavcodec     55.  2.100 / 55.  2.100
  libavformat    55.  2.100 / 55.  2.100
  libavdevice    55.  0.100 / 55.  0.100
  libavfilter     3. 53.101 /  3. 53.101
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
[avi @ 02207aa0] non-interleaved AVI
Guessed Channel Layout for  Input Stream #0.1 : stereo
Input #0, avi, from 'input.AVI':
    encoder         : Lavf55.2.100
  Duration: 00:06:43.20, start: 0.000000, bitrate: 59774 kb/s
    Stream #0:0: Video: dvvideo (dv50 / 0x30357664), yuv422p, 720x480 [SAR 8:9 D
AR 4:3], 29.97 tbr, 29.97 tbn, 29.97 tbc
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16
, 1536 kb/s
Output #0, mov, to 'export.mov':
    encoder         : Lavf55.2.100
    Stream #0:0: Video: dvvideo (dvcp / 0x70637664), yuv422p, 720x480 [SAR 8:9 D
AR 4:3], q=2-31, 30k tbn, 29.97 tbc
    Stream #0:1: Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, 1536 kb
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=    1 fps=0.0 q=-1.0 Lsize=   33677kB time=00:00:-54.-20 bitrate=N/A
video:234kB audio:33441kB subtitle:0 global headers:0kB muxing overhead 0.004605

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