HandBrake

Description of problem or question:
Encoding HEVC with Atmos to an MP4 container results in the Atmos being stripped to a base AC3 audio track at 640kbps



Steps to reproduce the problem (If Applicable):
Use a source file with Dolby Atmos track, encode it in Handbrake with all audio tracks passed through. Dolby Digital, Dolby Digital+, DTS-HD passes through fine but the Dolby Atmos seems to be stripped/downconverted to a 640kbps track. Is Atmos not supported in the MP4 container? I'd read that neither was DTS/DTS-HD MA but Handbrake has no problem muxing it in (and outpuit file seems to be playable). I'd love to rip to MP4 and keep the Atmos track! is this something that is possible?

Could you please post your HB logs, instructions can be found here:

https://handbrake.fr/docs/en/latest/hel ... y-log.html

If we had the log, we could determine what settings you used, what handbrake saw in the source, and how it dealt with it.

HandBrake cannot mux TrueHD/TrueHD+Atmos to the MP4 container (no publicly-available software can, as far as I know). Not really an issue since nothing would be able to play it back anyway…

Rodeo wrote: ↑Wed Feb 20, 2019 5:07 pm HandBrake cannot mux TrueHD/TrueHD+Atmos to the MP4 container (no publicly-available software can, as far as I know). Not really an issue since nothing would be able to play it back anyway…

Thanks for the reply, i was just about to post the log now...

That's interesting, seeing as DTS is (apparently) also not supported in the MP4 container, yet Handbrake does right these.

Maybe one day...

Nah, DTS in MP4 is supported… either via the officially-registered sample entry codes (like Dolby MLP/TrueHD)* which no publicly-available software I know of support, but also in an unofficial way (used by HandBrake) supported by a lot of open-source playback software (VLC and many others).

*the specifications for how to mux using the official sample entry codes aren't public (that I know of) and probably require official licensing, non-disclosure agreements, etc.