[MEncoder-users] Newbie Problem: Cutting Video

[belcampo]

Kale Good wrote:
> I'm trying to cut video using this command:
> mencoder -ss 43 -endpos 120 -oac copy -ovc copy beginner1.avi -o part2.avi
> 
> The problem is this: I enter -ss 43 but it actually starts at 47. It 
> does start any earlier than 47 until I reduce the entry time to -ss 38. 
> The same problem exists for times after 47.
Start-points are always at s- called I- or Key-frames. To be able to cut 
more 'precise' you have to add a smaller key-frame interval to your 
webcam-recording command-line. This will hurt file-size a 'little'
> 
> -endpos will correctly end in this same ranges (i.e. it will end at 39, 
> 40, 41 etc. when commanded to).
> 
> Possibly useful info:
> Video was made using webcam and this command (basically):
> mencoder tv:// -tv 
> driver=v4l2:width=320:height=240:device=/dev/video0:forceaudio:adevice=/dev/dsp1 
> -ovc lavc -oac mp3lame -lameopts cbr:br=64:mode=3 -o webcam.avi
> 
> 
> Thanks,
> Kale
> 
> 
> Kale Good Guitar Studio
> www.phillyguitarlessons.com
> kale at inbox.com
> (215)260-5383
> 997 North Marshall St.
> Philadelphia, PA 19123
> 
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