5.1 YouTube Support

[dts350z]

YouTube recently started supporting 5.1 Audio in AAC LC.

When using a downloader, these mp4 /m4a files play fine in VLC, however, even after doing this (to get the Youtube links to stream) https://forum.videolan.org/viewtopic.ph ... 26#p483226 , I only get stereo.

Is there a preference or another change to the youtube.luac file needed?

Example 5.1 on YouTube:

https://www.youtube.com/watch?v=EKxdYi_ ... hannel=Rog

[dts350z]

Info here seems to indicate we want Dolby encodings (although AAC 5.1 is there and would be higher quality IMHO): https://techcrunch.com/2022/06/08/youtu ... d-tv-roku/

[dts350z]

And, speaking of dolby, I guess I should point out that there 2 playback configs that should be supported:

1) decode locally for playback in windows via windows sound (5.1)

2) bitstream over hdmi to an AVR or TV that supports Dolby decoding (or AAC LC???).

[Lotesdelere]

Example 5.1 on YouTube:
https://www.youtube.com/watch?v=EKxdYi_NeNI

Yes, there are three 5.1 audio streams available: format ID 380 is AC-3, 328 is E-AC-3 and 258 is AAC.
But I had to use the help of PhantomJS to get them.

Is there a preference or another change to the youtube.luac file needed?

Yes, it looks like the youtube.lua script needs a serious update and maybe the help of some new components.

[dts350z]

How do we make that happen?

[Lotesdelere]

We just wait for the devs or some skilled volunteer(s) to update the LUA script.

Meanwhile, there is this batch file as a workaround:
https://forum.videolan.org/viewtopic.ph ... 15#p495615

You have to replace youtube-dl.exe with yt-dlp.exe and to set the correct path to VLC.exe.

[dts350z]

Does anyone know where those Audio format IDs (my term) come from?

I see examples where formats with same number of channels and channel order have different IDs, and also examples where a completely different codec has the same ID?

e.g. m4a ids 256 and 258 have the same channel layout (per mediainfo), and there is also a several other codecs with id 258 (m48, mp3, aac, wav, and flac)

[Lotesdelere]

Those are the Youtube IDs.

Code: Select all

ID EXT RESOLUTION FPS CH | FILESIZE TBR PROTO | VCODEC VBR ACODEC ABR ASR MORE INFO ------------------------------------------------------------------------------------------------------------ 380 m4a audio only 6 | 8.24MiB 384k https | audio only ac-3 384k 48k high, m4a_dash 328 m4a audio only 6 | 8.24MiB 384k https | audio only ec-3 384k 48k high, m4a_dash 258 m4a audio only 6 | 8.32MiB 388k https | audio only mp4a.40.2 388k 44k high, m4a_dash