Changes between Version 3 and Version 4 of Seeking


Ignore:
Timestamp:
Sep 12, 2012, 10:12:15 PM (7 years ago)
Author:
rogerdpack
Comment:

note -t

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  • Seeking

    v3 v4  
    11= Introduction =
    2 If you need to extract only a specific part of your input, you'll need to use the seeking option to get to that specific part in the input first. [http://ffmpeg.org/ffmpeg.html#Main-options The parameter -ss] is used to seek into the input and it can be used in several ways.
     2If you need to extract only a specific part of your input, you'll need to use the seeking option to get to that specific part in the input first. [http://ffmpeg.org/ffmpeg.html#Main-options The parameter -ss] is used to seek into the input and it can be used in several ways. 
    33
    44= Fast seeking =
     
    4545
    4646There is no general rule how to correctly set both time points for -ss options, because those depend on the keyframe interval used when the input was encoded. But, just for the purpose of some orientation, the x264 encoder uses the gop size of 250 (which means 1 keyframe each 10 seconds if the input frame rate is 25 fps).
     47
     48== Notes ==
     49
     50For instance to extract only a small segment in the middle of a movie, it can be used in combination with "-t" which specifies the duration, like -ss 60 -t 10 to capture from second 60 to 70.