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Thread: How to speed up slow motion video with virtualdub

  1. #1
    Junior Member
    Junior Member

    Join Date
    Jan 2010

    Post How to speed up slow motion video with virtualdub

    Ok This is my story.
    I have slow motion video file (audio indside are slow at the same speed too.)

    I try to use virtualdub to make this file speed up 2 time (30fps->60fps)
    but my video are faster but audio are slow as the original and it out of length of video (video are shorter than original).

    Is there any way to speed up audio along with video ?

    Sorry for my bad english. I am Thai.

  2. #2
    Lord of Digital Video
    Lord of Digital Video
    paglamon's Avatar
    Join Date
    Aug 2005
    22░38'12.55" N, 88░25'20.87" E


    Under "Video" select "Direct stream copy". Select "Frame rate". Under "source rate adjustment" check "change frame rate to(fps)" and put 60. Then under "Frame rate conversion" check "convert to fps" and put 30.
    Under "Audio" select "Full processing mode". Then check "Use advanced filtering". Now select "Filters". Under Audio filters make a filter chain: INPUT -> STRETCH -> OUTPUT. Select Stretch and configure it e.g. Stretch ratio will be 0.5 if you want to double the speed (which is your case) of audio and will be 2.0 if you want to halve the speed.Select appropriate "compression" .
    Now save as avi. Video will not be reencoded.Audio will be.
    Now save as avi.


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