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Encode an Xvid with AC3 in an MP4 container. - VideoHelp Forum
https://forum.videohelp.com/threads/295135-Encode-an-Xvid-with-AC3-in-an-MP4-container#:~:text=guns1inger%20is%20quite%20correct%20-%20the%20MP4%20container,don%27t%20remember.%20DTS%20and%20AC3%20are%20not%20supported.
AC3 audio doesn't work properly inside MP4 container ...
https://code.videolan.org/videolan/vlc/-/issues/2524
AC3 audio inside MP4 container doesn't work properly in VLC. There are two issues: You cannot select SPDIF output for AC3 audio if it is inside MP4 container. Channel mappings are wrong when AC3 is inside MP4.
How to Convert AC3 Audio to AAC in MP4/MKV Video
https://www.videosolo.com/tutorials/convert-ac3-to-aac.html
AC3 audio can be applied in many video containers including MP4 and MKV. But, the compatibility of AC3 audio is poor, which means you may can't hear the sound when playing MKV/MP4 videos, especially on QuickTime, iTunes, as well as iPhone, iPad, etc. So, people are searching for a way to convert audio in MP4/MKV from AC3 to AAC, as those media devices …
AC3 5.1 surround sound mux with MP4 - VideoHelp Forum
https://forum.videohelp.com/threads/371899-AC3-5-1-surround-sound-mux-with-MP4
AC3 became offically supported by MP4 container a few years ago . It's in the mp4ra and ISO base specs The problem is not all Apple programs like it. They made their own modified MP4 container - "M4V" to hold AC3. Videos/movies on Itunes come on this format , for example . (it's really a MP4 container)
Encode an Xvid with AC3 in an MP4 container. - VideoHelp Forum
https://forum.videohelp.com/threads/295135-Encode-an-Xvid-with-AC3-in-an-MP4-container
guns1inger is quite correct - the MP4 container does not support AC3 audio. You have to use AAC, Apple Lossless, MPEG audio (including MP3 and MP2) or some weird, little used formats that I don't remember. DTS and AC3 are not supported.
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