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How to combine two audio tracks into one audio track ?

Discussion in 'Convert video to another format' started by alphaque, May 15, 2011.

  1. alphaque

    alphaque Member

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    I have a karaoke video clip in MKV format, it has two audio tracks, one track is the OGG VORBIS 2CH track that comes with the original singer vocal, and the other track is the OGG VORBIS 2CH track that is only the music. I would like to know how to convert this video clip to combine the two audio tracks into one audio track which is stereo with 2CH (Left channel : music and right channel : vocal) so when i play it in the karaoke system ? With that, i can toggle between music and vocal. thanks
     
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  3. attar

    attar Active member

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    If you are familiar with MKVExtract and Audacity you should be able to demux the audio tracks from the video and use Audacity to process them.
    After the files are processed you can then mux them into the video using MKVMerge

    Drag the first demuxed audio track into Audacity.
    To the left of the track, click anywhere inside the information panel to highlight and select the track.
    Click the panel menu drop button ▼ (the small inverted pyramid) and 'Split stereo to mono'.
    On the Top menu, click 'Tracks' > 'Mix and render'.
    The result is a single mix.

    Drag the second track into Audacity and select it.
    Repeat the split to mono and mixing.

    You should have two separate mixes.

    Select the first mix and from it's drop down menu, select 'Make stereo track'.

    Both mixes are now a single stereo track with left and right channels containing their respective audio.
    Click 'File' > 'Export' and save the new file.
     
  4. alphaque

    alphaque Member

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    Hi
    thanks, after i created two separate mixes, i can't select the first mix and from it's drop down menu, select 'Make stereo track' as that option is disabled and not available to select, pls help....

    thanks
     
    Last edited: May 15, 2011
  5. attar

    attar Active member

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    Can you select the second mix?
     
  6. alphaque

    alphaque Member

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    Hi Attar
    yes,that works ! :) thanks for your advice..

    BTW, i notice the voice and the video are a few seconds out of sync, this is quite annoying when it is used for karaoke as the lyrics showed do not match the singer vocal..any help in fixing this ? thanks
     
  7. attar

    attar Active member

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    If you play the file with MPC, you can estimate the delay with the + and - keys (with VLC it's the j k keys).
    You can insert that value in MKVMerge.
    My example shows a video where the audio requires a constant correction of negative 500 m/S to get it back in sync.

    [​IMG]
     
  8. alphaque

    alphaque Member

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    thanks attar !! everything is working fine now, i learned a lot from you here :)
     

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