MP4Joiner allows you to join multiple MP4 files into one without reencoding and without quality loss. MKV's tend to be more forgiving than MP4's.MP4Tools comes with two programs, MP4Joiner and MP4Splitter, to split and join MP4 files. Also, if the originals are MKV videos, you could try joining those files with something like MKVtools and then re-encoding the joined videos. Joining just a few files at a time can be successful. Processing the files through MP4tools first (passthru or you might have to re-encode some of the tracks) can also improve results. There are some tweaks that you can try when you don't get good results. For example, it seems that handbrake encoded files can give bad results, though I'm not sure why. Success mostly depends on how the originals were encoded. Usually it requires a complete re-encode like what quicktime does, but often we can get around that, which is what MP4tools tries to do.
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