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I've had some issues with Movie Studio (the consumer version of Vegas Pro) opening m2ts files (not similar to yours, though).
However, h264+aac in mp4 has worked fine instead of m2ts, so you could just try remuxing with ffmpeg -i file.m2ts -c:v copy -c:a copy file.mp4 (based on your output, the files are h264+aac inside m2ts).
If that doesn't work, you could try reconverting the audio (as that seems to be the issue) just with ffmpeg -i file.m2ts -c:v copy -c:a aac -strict -2 -b:a 240k -r:a 48000 -async 1 file.mp4.
I'm using -async 1 because you seem to have some issues with the audio. I've noticed ffmpeg does not deal with any start packet mismatch or gaps in audio (or vfr files) properly (missing audio, video/audio not in sync etc) without async specified.
Not the ideal solution (conversion is not lossless), but give it a try in case that would at least get you forward. If that works, you could try with pcm_s16le (with the async option) if that helps.
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