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Convert Left/Right Audio Channels to Seperate tracks in MP4

Discussion in 'Other video questions' started by archivus, Feb 7, 2012.

  1. archivus

    archivus Member

    Feb 7, 2012
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    I have several terabytes of H246 MP4 video with 2 audio tracks.

    The 1st track contains a left and right channel.
    The left channel is one language.
    The right channel is a second language.

    The 2nd track is a third language in the left channel.

    What I need is to extract the left and right from track 1 as well as the left channel from track 2 and then save the 3 to separate tracks.

    Track 1: left-english mono, right-french mono
    Track 2: left-spanish mono

    New file:
    Track 1: English - left/right mono
    Track 2: French - left/right mono
    Track 3: Spanish - left/right mono

    Is this possible with any current tools and if so how would I go about doing this?
  2. attar

    attar Senior member

    Jun 17, 2005
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    It's possible - but for 'several terabytes' it would be time consuming.

    You have to demux the video and audio into separate streams using the likes of YAMB.

    Audacity can be use to load the first stereo audio track and split it into two mono streams.
    Since devices send a mono streams to both speakers, you can simply select one stream and save it as a new mono track.
    Repeat for the second stream.

    Run YAMB and load the previously demuxed video plus the new audio streams then mux them to create a new video.

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