Pass through Blu-ray video from MKV to MP4 with ffmpeg:
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YOu can passthough MVK conetnt riped from a blu-ray disk to mp4 for playback on web browsers and ps3 without sacruficeing video quality and having decent sound with
the linux based ffmpeg cli command.

You will need to convert the audio to aac but can have a high bit rate for decent sound.

To do this have this command:

ffmpeg -i original.mkv -acodec aac -b:a 400k  -vcodec copy  new.mp4

Replace original.mkv with source file name and new.mp4 with your new files name.
This will just passthrough the MPG4 video for to the mp4 containerwithout any compression and convert the AC3 audio to AAC at 400KB/s. (AC3 is not suported with mp4 container).

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Sources:
https://www.arj.no/2021/01/24/container-conversion/
https://en.wikipedia.org/wiki/Advanced_Video_Coding
https://askubuntu.com/questions/1315697/could-not-find-tag-for-codec-pcm-s16le-in-stream-1-codec-not-currently-support

Date: March 11th, 2021