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  1. Hi. I'm new here and need advice. When I have mkv file with DTS audio I use MKV2AC3 and I add very fast 2nd (AC3) audio track to my mkv file. How to do this same operation with .......hdtv.x264.mp4 file (audio in this file is AAC)?
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  2. Use MKVMergeGUI. It's part of MKVToolnix. Open the mp4 with MKVMergeGUI, use it to re-save the mp4 as an MKV and then use your usual method.
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  3. Code:
    MP4Box -add audio2.mp3 existing.mp4
    see: http://gpac.wp.mines-telecom.fr/mp4box/
    I would guess YAMB and other MP4Box GUIs should be able to do it through a gui,...
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