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Прави 12 MB файл, който започва където трябва, но плейва под секунда и спира, а броячът ми показва дължина 02:51 независимо какво време задавам. Ето какво дъмпи на конзолата:

d:\Downloads>ffmpeg.exe -ss 00:16:42.000 -t 100 -i inp.flv -acodec copy -vcodec copy out.flv

FFmpeg version SVN-r20900-Sherpya, Copyright (c) 2000-2009 Fabrice Bellard, et al.

  built on Dec 20 2009 03:53:05 with gcc 4.2.5 20080919 (prerelease) [Sherpya]

  libavutil     50. 7. 0 / 50. 7. 0

  libavcodec    52.43. 0 / 52.43. 0

  libavformat   52.44. 0 / 52.44. 0

  libavdevice   52. 2. 0 / 52. 2. 0

  libavfilter    1.12. 0 /  1.12. 0

  libswscale     0. 7. 2 /  0. 7. 2

  libpostproc   51. 2. 0 / 51. 2. 0

[flv @ 0037bea0]Estimating duration from bitrate, this may be inaccurate



Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 25.00 (25/1)

Input #0, flv, from 'inp.flv':

  Metadata:

    duration        : 1174

    width           : 320

    height          : 240

    videodatarate   : 0

    framerate       : 25

    videocodecid    : 2

    audiosamplerate : 44100

    audiosamplesize : 16

    stereo          : false

    audiocodecid    : 2

    filesize        : 84151470

  Duration: 00:19:33.51, start: 0.000000, bitrate: 64 kb/s

    Stream #0.0: Video: flv, yuv420p, 320x240, 25 tbr, 1k tbn, 1k tbc

    Stream #0.1: Audio: mp3, 44100 Hz, 1 channels, s16, 64 kb/s

Output #0, flv, to 'out.flv':

    Stream #0.0: Video: flv, yuv420p, 320x240, q=2-31, 1k tbn, 1k tbc

    Stream #0.1: Audio: libmp3lame, 44100 Hz, 1 channels, 64 kb/s

Stream mapping:

  Stream #0.0 -> #0.0

  Stream #0.1 -> #0.1

Press [q] to stop encoding

frame= 4296 fps=  0 q=-1.0 Lsize=   12029kB time=171.29 bitrate= 575.3kbits/s

video:10518kB audio:1341kB global headers:0kB muxing overhead 1.434008%