[HELP] MP4 can't encode with PCM, but why this MP4 file can?

[Selur]

so if i encode x264+PCM with mov in Hybrid, i can get a .mov file, then i can change the extension name to .mp4 directly, to achieve the goal?

Yes, you will get a non-standard conform file. In a professional context that would be a no-go, but sure it can be done.

and another question, all these tracks could be muxed by Hybrid to get one single best audio track?

No, Hybrid has no option to 7 stereo audio stream into a 13.1 or 14 channel audio track.

Cu Selur