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trim 165 MB video clip with ffmpeg (only last 3 minutes)

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Top Forums UNIX for Advanced & Expert Users trim 165 MB video clip with ffmpeg (only last 3 minutes)
# 1  
Old 11-18-2011
trim 165 MB video clip with ffmpeg (only last 3 minutes)
Hi

original video clip

Code:
> ls -alh reallynotpr0n.flv 
-rw-r--r--  1 jonny  staff   165M Nov 18 19:57 reallynotpr0n.flv

trying to cut only last 3 minutes of the clip out.

Code:
> ffmpeg -i reallynotpr0n.flv -vcodec copy -acodec copy -ss 00:52:00 -t 00:03:48 trimmed_video.avi
ffmpeg version 0.7.7, Copyright (c) 2000-2011 the FFmpeg developers
  built on Nov  6 2011 05:05:03 with gcc 4.2.1 (Apple Inc. build 5666) (dot 3)
  configuration: --prefix=/opt/local --enable-gpl --enable-postproc --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libdirac --enable-libschroedinger --enable-libopenjpeg --enable-libxvid --enable-libx264 --enable-libvpx --enable-libspeex --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/gcc-4.2 --arch=x86_64 --enable-yasm
  libavutil    50. 43. 0 / 50. 43. 0
  libavcodec   52.122. 0 / 52.122. 0
  libavformat  52.110. 0 / 52.110. 0
  libavdevice  52.  5. 0 / 52.  5. 0
  libavfilter   1. 80. 0 /  1. 80. 0
  libswscale    0. 14. 1 /  0. 14. 1
  libpostproc  51.  2. 0 / 51.  2. 0
[flv @ 0x7fa2aa84ac00] Estimating duration from bitrate, this may be inaccurate
Input #0, flv, from 'reallynotpr0n.flv':
  Duration: 00:55:48.67, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: flv, yuv420p, 480x400, 1k tbr, 1k tbn, 1k tbc
    Stream #0.1: Audio: nellymoser, 8000 Hz, mono, s16
Output #0, avi, to 'trimmed_video.avi':
  Metadata:
    encoder         : Lavf52.110.0
    Stream #0.0: Video: flv, yuv420p, 480x400, q=2-31, 1k tbn, 1k tbc
    Stream #0.1: Audio: nellymoser, 8000 Hz, mono
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Could not write header for output file #0 (incorrect codec parameters ?)

specs abut *.flv file

Code:
> ffmpeg -i reallynotpr0n.flv 
ffmpeg version 0.7.7, Copyright (c) 2000-2011 the FFmpeg developers
  built on Nov  6 2011 05:05:03 with gcc 4.2.1 (Apple Inc. build 5666) (dot 3)
  configuration: --prefix=/opt/local --enable-gpl --enable-postproc --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libdirac --enable-libschroedinger --enable-libopenjpeg --enable-libxvid --enable-libx264 --enable-libvpx --enable-libspeex --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/gcc-4.2 --arch=x86_64 --enable-yasm
  libavutil    50. 43. 0 / 50. 43. 0
  libavcodec   52.122. 0 / 52.122. 0
  libavformat  52.110. 0 / 52.110. 0
  libavdevice  52.  5. 0 / 52.  5. 0
  libavfilter   1. 80. 0 /  1. 80. 0
  libswscale    0. 14. 1 /  0. 14. 1
  libpostproc  51.  2. 0 / 51.  2. 0
[flv @ 0x7fe6ba04ac00] Estimating duration from bitrate, this may be inaccurate
Input #0, flv, from 'reallynotpr0n.flv':
  Duration: 00:55:48.67, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: flv, yuv420p, 480x400, 1k tbr, 1k tbn, 1k tbc
    Stream #0.1: Audio: nellymoser, 8000 Hz, mono, s16
At least one output file must be specified

the resulting (trimmed) clip has size zero.

Code:
> ls -al trimmed_video.avi 
-rw-r--r--  1 jonny  staff  0 Nov 18 20:25 trimmed_video.avi

# 2  
Old 11-21-2011
Maybe because of this?

Code:
[flv @ 0x7fa2aa84ac00] Estimating duration from bitrate, this may be inaccurate

# 3  
Old 11-21-2011
Quote:
Originally Posted by mirni
Maybe because of this?

Code:
[flv @ 0x7fa2aa84ac00] Estimating duration from bitrate, this may be inaccurate

what do you recommend me to fix it?

is my CLI syntax correct?
# 4  
Old 11-22-2011
I was able to trim a test video on my machine with the syntax you provided, so I think it is correct. What I meant in the previous post was to double check the duration of the video (launch it in mplayer or some other player and skip to the end, see what is the duration). It may be that the video is shorter than 52 minutes, in which case you are telling ffmpeg to skip beyond the end of file.
Is it working, if you are trying to trim the first 3 minutes? or the 3 minutes somewhere in the middle of file?
Is it working with some other .flv file?
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