audio channels over limit?

[justinrh 175]

I have a 5.1 audio system.  If I tell ATV, in Playback settings > Audio, to convert unsupported audio to Digital Dolby, and my file has AAC 5.1, stats tells me it is delivering 7.1 channel audio to my system and shows a conversion reason of "Audio channels over limit".  This does not compute with me.  Can someone explain?

ON_ffmpeg-remux-d31f3526-3dc6-4937-aac1-366572ff862d_1.txt

App log sent @ 11:44am ET, user home.

 

Edited January 28, 2023 by justinrh

[Happy2Play 8296]

Devs will have to comment but the log shows aac 5.1 conversion to ac3 5.1.

&aac-audiochannels=2
&TranscodeReasons=AudioChannelsNotSupported

Log shows conversion to 5.1

-c:v:0 copy -bsf:v:0 h264_mp4toannexb -c:a:0 ac3 -ab:a:0 256140 -ar:a:0 48000 -ac:a:0 6

10:42:22.311   Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1, fltp, 256 kb/s (default)

 

[justinrh 175]

Okaaayyy.  What is Emby stats telling me?  7.1 channels shouldn't even be in the equation, but it is.  Is Emby saying it needs to send 7.1 or that it thinks I have 7.1?

Why the overlimit error?

[justinrh 175]

1 hour ago, Happy2Play said:

aac-audiochannels=2

Actually, Happy, doesn't it show that Emby thinks it is stereo source?

Oh, I get the error now:  2 + 5.1 = 7.1! 

[Happy2Play 8296]

3 minutes ago, justinrh said:

Actually, Happy, doesn't it show that Emby thinks it is stereo source?

Oh, I get the error now:  2 + 5.1 = 7.1! 

No that is client playback protocol saying it can only handle 2 channel aac.  Since your track is more than 2 channels you will get "Audio channels over limit".

&aac_latm-audiochannels=8&mp4a_latm-audiochannels=8&ac3-audiochannels=8&eac3-audiochannels=8&trueHD-audiochannels=8&dts-audiochannels=8&dca-audiochannels=8&dtshd-audiochannels=8&aac-audiochannels=2&mp3-audiochannels=8

I guess the question is why your system shows limited to 2 channel aac as I have seen others logs showing 8 but can only guess as I am not a Android user but may have to do with client settings.

[Luke 37116]

It's not an error. One reason could be if you enabled the audio down mix option in the app.

[Happy2Play 8296]

6 minutes ago, Luke said:

It's not an error. One reason could be if you enabled the audio down mix option in the app.

Confused on where this comes from though as there is nothing in the ffmpeg log for this.

Is the client changing the converted ac3 5.1 also?

[ebr 14930]

Hi.  That's telling you the reason it is converting which is this:

14 hours ago, justinrh said:

If I tell ATV, in Playback settings > Audio, to convert unsupported audio to Digital Dolby

Most devices will not accept multi-channel AAC so the app is doing what you asked it to do.

As for why it says it is delivering 7.1, I'm not sure,  That information is coming from the transcoding information the app gets from the server so something must be off there.

[justinrh 175]

On 1/28/2023 at 6:45 PM, Luke said:

if you enabled the audio down mix option in the app.

@Luke I can't have down mix set and convert unsupported at the same time.

So, if you can put this bug on your board, it would be appreciated.

[Luke 37116]

7 minutes ago, justinrh said:

@Luke I can't have down mix set and convert unsupported at the same time.

So, if you can put this bug on your board, it would be appreciated.

Put what back on the board? Didn't ebr answer your question?

[justinrh 175]

You mean you took it off the board once already?  LOL

The errant information needs to be resolved -> Emby says it is sending 7.1 audio.

ebr explained why Emby is transcoding, but he could not explain the above.

[Happy2Play 8296]

On 1/29/2023 at 5:36 AM, ebr said:

As for why it says it is delivering 7.1, I'm not sure,  That information is coming from the transcoding information the app gets from the server so something must be off there.

Yes the 7.1 is a mystery.

But do not know what 63 represents here.