I failed remux video and audio on fffmpg, when I use remuxed file on premiere, that cannot played.
So I use to timeline,video/audio file only.
But again, audio file was not correct lipsync, progress of the timeline The audio is gradually shifted out of sync.

recover_mp4.exe good.mp4 –analyze
recover_mp4.exe C0001_bad.MP4 result.h264 result.wav –sony –pcmfix 17760
ffmpeg.exe -r 30000/1001 -i result.h264 -i result.wav -c:v copy -c:a copy result.mov

Lorin, thanks for the tip!

For those with Sony a7 cameras — I was banging my head against the wall for awhile trying to recover a 720p 30fps video, and then realised that although the bitrate and framerate and everything else matched, the “good” MP4 I was using was recorded with a different orientation than my “bad” one — portrait vs landscape. It is important on these cameras (and perhaps many) to make sure it’s tilted the same way — and who knows, maybe portrait rotated to the left is different than portrait to the right!

After getting that straight the video was recovered, but no audio. What finally worked to also have audio, this being a Sony camera, was:

recover_mp4 good.mp4 –analyze
recover_mp4 good.mp4 bad.mp4 result.h264 result.aac –sony
ffmpeg -i result.h264 -i result.aac -c:v copy -c:a copy -map 0:v:0 -map 1:a:0 result.mp4

Good luck, all, and thanks for this write-up.