Issue 580899 in chromium: Chrome OS does not downmix 5.1/7.1 channel audio over HDMI

[chro...@googlecode.com]

Status: Unconfirmed
Owner: ----
Labels: Type-Bug Pri-2 OS-Chrome

New issue 580899 by jholmer...@gmail.com: Chrome OS does not downmix
5.1/7.1 channel audio over HDMI
https://code.google.com/p/chromium/issues/detail?id=580899

Chrome Version: 47.0.2526.110 (64-bit)
Chrome OS Version: Platform 7520.67.0
Chrome OS Platform: Asus Chromebox CN60
Network info: Not applicable
Label: Cr-Internals-Media-Audio

Steps To Reproduce:
1. Plug Chromebox into TV with stereo speakers via HDMI
2. Load a video file with 5.1 or 7.1 channel audio in Google Chrome.
- Example:
http://falcon479.startdedicated.com/files/Hotel-Transylvania-2.mp4
- (For legal reasons, please do not share the above file for purposes
other than investigating this bug.)
3. Attempt to watch the video through Chrome's HTML5 video player

Expected Result:
Surround sound audio should be downmixed to 2.0 stereo so all channels are
audible

Actual Result:
Only the left and right channels are audible, the rest of the channels are
lost

How frequently does this problem reproduce?
Always reproducible with AAC 5.1 or 7.1 channel audio. Reproduced on two
different TVs, with multiple video files. Not tested with other audio
codecs.
I tested on a Macbook Pro via HDMI on one of the above TVs, with same video
file linked above, in Chrome 47 and 48. The audio was downmixed properly on
Chrome on OS X 10.11.

What is the impact to the user, and is there a workaround? If so, what is
it?
Movies with 5.1 or 7.1 channel audio are not watchable on a Chromebox
connected to a TV with stereo speakers (most of the dialogue is lost since
it is on the center channel). Workaround is to use a TV with surround sound
speakers (this is an expensive workaround).


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[chro...@googlecode.com]

Updates:
Labels: Cr-OS-Kernel-Audio

Comment #1 on issue 580899 by dhadd...@chromium.org: Chrome OS does not

downmix 5.1/7.1 channel audio over HDMI
https://code.google.com/p/chromium/issues/detail?id=580899

(No comment was entered for this change.)

[chro...@googlecode.com]

Updates:
Owner: mu...@chromium.org

Comment #2 on issue 580899 by dgr...@chromium.org: Chrome OS does not

downmix 5.1/7.1 channel audio over HDMI
https://code.google.com/p/chromium/issues/detail?id=580899

A feedback report would help a lot as it would include the EDID. Can you
file one with alt-shift-i? Add this bug number to the report.

Mussa, can you try to reproduce this?

My guess is that the TV is reporting it can play multi-channel PCM, if it
indicates it only supports two channels it will be down mixed.

[chro...@googlecode.com]

Updates:
Owner: ka...@chromium.org
Cc: mu...@chromium.org rohi...@chromium.org avkodipe...@chromium.org

Comment #3 on issue 580899 by mu...@chromium.org: Chrome OS does not

downmix 5.1/7.1 channel audio over HDMI
https://code.google.com/p/chromium/issues/detail?id=580899

kalin@ might be better positioned to help with this.

[chro...@googlecode.com]

Comment #4 on issue 580899 by jholmer...@gmail.com: Chrome OS does not

downmix 5.1/7.1 channel audio over HDMI
https://code.google.com/p/chromium/issues/detail?id=580899

I have just submitted a feedback report from the affected chromebox.

[chro...@googlecode.com]

Comment #5 on issue 580899 by mu...@chromium.org: Chrome OS does not

downmix 5.1/7.1 channel audio over HDMI
https://code.google.com/p/chromium/issues/detail?id=580899

jholmer.in's report: http://feedback/#/Report/6804069755