How to combine a m4s (Fragmented Mp4 Files) into one mp4 File

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MP4 is supported out of the box by our encoder. You can use our MP4 API for that.
https://developer.bitmovin.com/encoding/reference/postencodingencodingsmuxingsmp4byencodingid

If you want to reuse your existing fragmented MP4s, you can also concatenate them into a single MP4 with the following steps :

1- Concatenate audio and video segments into 1 file each

cat init.m4s seg1Video.m4s seg2Video.m4s .... > outVideo.mp4
cat init.m4s seg1Audio.m4s seg2Audio.m4s .... > outAudio.mp4

2- Merge both tracks into one single MP4 file
ffmpeg -i outVideo.mp4 -i outAudio.mp4 -c copy -map 0:v -map 1:a output.mp4

Please let us know in case you have any questions