ffmpeg duration start

Question

Hi Folks,

When I run ffmpeg -i 115050295.wmv, I get the following data.

Input #0, asf, from '115050295.wmv':
  Duration: 00:02:22.53, start: 3.100000, bitrate: 1462 kb/s
    Stream #0.0: Video: wmv2, yuv420p, 640x360, 29.92 tbr, 1k tbn, 1k tbc
    Stream #0.1: Audio: wmav2, 44100 Hz, stereo, s16, 96 kb/s

The duration mentioned here is 2 min 22 secs, with start: 3.1 (What is this start tag mean?)

The actual duration of the file when played from a player is 2 mins 25 secs.

Should i add the duration and the start value to come up with the total duration? I could not find any documentation explaining the 'start' value.

FFmpeg version 0.5.1, Copyright (c) 2000-2009 Fabrice Bellard, et al.

Please let me know.

Thanks Ashish