The VideoLAN Forums

Hello

I've searched the forums for this problem, but can't seem to find anyone who is experiencing it, so here goes:

I have my Apple hooked up via HDMI to my TV, which then passes the audio through to my 5.1 soundbar through another HDMI cable (using ARC). My soundbar has an LED indicator that illuminates any time a video has 5.1 surround sound. Otherwise, it just takes the stereo signal and "forces" surround sound to all of the speakers. One of the more recent updates to VLC for Apple TV allowed for audio passthrough using S/PDIF, which has been great for several files I have that use AC3 surround. When playing those files, the LED lights up and I get true surround from my system. However, when I play several files that I have that use AAC surround, I get audio, but the LED does not light up and I can tell by listening to the audio that the system is just taking stereo and sending it to all of the speakers. I've tried several files that have AC3 and they all work. I've tried several files with AAC and none of them seem to be sending the true 5.1 signal to my soundbar. I am positive that both AC3 and AAC files have 5.1 and not stereo, as I have a program on my computer that will analyze a file and tell you an incredible amount of detail about the file (MediaInfo Mac).

Has anyone else experienced this? Is this a bug? Is it a problem with my soundbar, not the file?
Basically, I've tried everything I know to try and can't figure out where the problem is. Any and all information you guys can provide would be immensely helpful.

Thanks

We support passthrough for AC-3 only at the moment. It is not supported for AAC as of yet. This is a generic, cross-platform limitation of VLC.

We support passthrough for AC-3 only at the moment. It is not supported for AAC as of yet. This is a generic, cross-platform limitation of VLC.

Thank you for your reply. Is this a feature that will be added in the future? I know you may not have an exact timeline, I'm just wondering if this is a feature that is being considered at all.

Thanks again.

Yes, it is on our list for future releases

I can see this issue has been on the list for at least two years so I'm wondering is there a work around for this issue?

In fact, Apple removed the API we used for AC-3 passthrough on Apple TV without an alternative, so at present, we can't do it for any format, even though we'd love to and our part of the code is defacto ready for use.

Hi All,

Is there already a solution for this problem?
I've my Apple TV 4K hooked up to my TV and my Surround receiver is connected to my TV via HDMI ARC.
I use VLC as my primary internal video player. All my movies are MKV containers with 5.1 audio. If I play those files I only get sound from my front speakers. Also on my receiver I can clearly seeing the LED's of 5.1 audio, so in one way or another it seems that the 5.1 audio is detected but not coming through to my receiver.

Why does this problem still exist with VLC?

All my 5.1 Netflix streams are well played through all speakers from the same Apple TV 4K.

Thanks!

Hi All,

I have the same issue. The video container is MkV, 5.1 audio. I get only audio from the front speakers, however, the receiver and the TV shows the audio is Dolby Digital.

The configuration is the same as some previous posts "I've my Apple TV 4K hooked up to my TV and my Surround receiver is connected to my TV via HDMI ARC."

As a test, I have played the movie on the iMac using MK-player, then, stream the movie directly to the TV (In this test the AppleTV is not used, the purpose is to test the file and the TV+Receiver setup). I can hear the 5.1 sound in the receiver successfully.

Netflix, Disney+ works correctly with 5.1 DD audio on AppleTV.

Is this issue going to be fixed?

Thanks in advance!!