New answers tagged mac
i think MPEG Streamclip can do this. It's free on mac and pc.
I was encountering audio sync issues when trying to do this with Avidemux, but I came upon a two-step process that keeps the audio in sync: Concatenate files using MKVToolNix (I used version 7.4.0 for Mac). This results in a Matroska video (.mkv) file. Remux the .mkv file to MP4 format using Avidemux (I used verison 2.6 for Mac). I chose the MP4v2muxer ...
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