How to replace part of audio in a video using the command line?

07
2014-07
  • sumek

    Part of a recorded audio contains sensitive information. I want to remove that information while keeping the video and rest of the audio intact. Ideally using command line and being able to exactly specify the beginning and end.

    • Answers
  • user204841

    Segment, replace audio of portion that you want, concat the pieces back together.

    https://www.ffmpeg.org/ffmpeg-formats.html#segment_002c-stream_005fsegment_002c-ssegment

    http://stackoverflow.com/questions/12368151/adding-silent-audio-to-mov-in-ffmpeg

    https://trac.ffmpeg.org/wiki/How%20to%20concatenate%20(join,%20merge)%20media%20files

    I do not know if this will provide a flawless execution but it is how I would solve your problem.


    • Related Question

    Command line tools for copying parts of video
  • iceman

    I have a divx video of 10 mins. I want to copy two parts from it , minutes 2 to 6 and 8 to 10 and create another video by merging the two. how can I do it using lightweight command line tools. Either on Windows or Linux?


    • Related Answers
  • slhck

    Perhaps ffmpeg/mencoder (available on either platform).

    To split:

    ffmpeg -ss [start_seconds] -i [input_file] -t [duration_seconds] [outputfile]

    For example:

    ffmpeg -ss 2 -i input.avi -c copy -t 4 video1.avi
ffmpeg -ss 8 -i input.avi -c copy -t 2 video2.avi

    To merge:

    mencoder -ovc copy -oac copy video1.avi video2.avi -o output.avi

    If your video/audio is out of synchronization, you might need to re-encode them, e.g. with XviD for an AVI container, and MP3 audio:

    ffmpeg -ss 2 -i input.avi -c:v libxvid -qscale:v 3 -c:a libmp3lame -q:a 3 -t 2 output.avi

    Change the qscale parameter to a lower value for higher quality, and the same for q:a for the audio parts.

  • Rory

    To split the video there's a hand command line tool called jumptheshark.