is this flash or html5?

Both flash and html5 have this problem

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This problem is related to  Issue #343839 :

That is a bad idea, using system default sink will ignore user preference, which is annoying.

Another odd thing is that if I build chromium myself (linked against libpulse on my system), chromium starts picking up the default sink in PulseAudio. Whereas the official chrome build from the dev channel (libpulse statically linked??) doesn't use the default sink.

Dale, is this chrome related bug? it sounds platform related. Can you confirm and re-assign?

To use the system default device instead of the application default was an intentional change (as pointed to in comment #4). It has not yet made it to stable, hence different behavior there.

nialv7: To understand the problem more, what is the use case when you want to select and remember a different output device for Chrome than the system default? If you want to change the output device for all audio, the system audio settings would normally be changed.

I don't think the difference in behavior is version related. I tested chromium 51 (which I built against system libpulse) and chrome from both dev and beta channel. Chromium 51 will pick the system default, and chrome doesn't seems to honor the default sink setting. 

As for use case, I have multiple laptops and I route audio over network using pulseaudio. So sinks can come and go, the default sink is not always what I want. Also sometimes I only want to route chrome's audio without affecting other applications 

It even says in the pulseaudio document that you should use NULL for dev: https://freedesktop.org/software/pulseaudio/doxygen/stream_8h.html#ab9544f6677af133fbe81bf8a21eb489c

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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/398915beccf80d5e9632b4fa8ea4f61bbc0b4835

commit 398915beccf80d5e9632b4fa8ea4f61bbc0b4835
Author: grunell <grunell@chromium.org>
Date: Thu May 19 13:42:37 2016

Use "application default" audio device as default PulseAudio device.

This reverts commit 254c78a58a9da3a320c5ce8b1d84c0843fe3b8bc (https://codereview.chromium.org/1711823004) which changed to use the system default. That change causes problems for some use cases.

BUG= 606163 
TBR=tommi@chromium.org (this is a revert)

Review-Url: https://codereview.chromium.org/1992203002
Cr-Commit-Position: refs/heads/master@{#394758}

[modify] https://crrev.com/398915beccf80d5e9632b4fa8ea4f61bbc0b4835/media/audio/pulse/pulse_input.cc
[modify] https://crrev.com/398915beccf80d5e9632b4fa8ea4f61bbc0b4835/media/audio/pulse/pulse_input.h
[modify] https://crrev.com/398915beccf80d5e9632b4fa8ea4f61bbc0b4835/media/audio/pulse/pulse_output.cc
[modify] https://crrev.com/398915beccf80d5e9632b4fa8ea4f61bbc0b4835/media/audio/pulse/pulse_output.h
[modify] https://crrev.com/398915beccf80d5e9632b4fa8ea4f61bbc0b4835/media/audio/pulse/pulse_util.cc
[modify] https://crrev.com/398915beccf80d5e9632b4fa8ea4f61bbc0b4835/media/audio/pulse/pulse_util.h

I think the problem described in the use case in comment #11 warrants a revert of the change we did earlier. We'll have to revisit the original need for making that change.

Requesting merge for the revert in comment #14. This is a low risk merge, it takes us back to previous behavior.

Approving merge for the revert to M51 branch 2704  based on comment #16. Please revert it ASAP as we're getting very close to M51 stable candidate cut.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8726fa7e9fafe6969fc5fcb8fe92c53872baa014

commit 8726fa7e9fafe6969fc5fcb8fe92c53872baa014
Author: Henrik Grunell <grunell@chromium.org>
Date: Fri May 20 08:44:49 2016

Use "application default" audio device as default PulseAudio device.

This reverts commit 254c78a58a9da3a320c5ce8b1d84c0843fe3b8bc (https://codereview.chromium.org/1711823004) which changed to use the system default. That change causes problems for some use cases.

BUG= 606163 
TBR=tommi@chromium.org (this is a revert)

Review-Url: https://codereview.chromium.org/1992203002
Cr-Commit-Position: refs/heads/master@{#394758}
(cherry picked from commit 398915beccf80d5e9632b4fa8ea4f61bbc0b4835)

Review URL: https://codereview.chromium.org/1998173002 .

Cr-Commit-Position: refs/branch-heads/2704@{#615}
Cr-Branched-From: 6e53600def8f60d8c632fadc70d7c1939ccea347-refs/heads/master@{#386251}

[modify] https://crrev.com/8726fa7e9fafe6969fc5fcb8fe92c53872baa014/media/audio/pulse/pulse_input.cc
[modify] https://crrev.com/8726fa7e9fafe6969fc5fcb8fe92c53872baa014/media/audio/pulse/pulse_input.h
[modify] https://crrev.com/8726fa7e9fafe6969fc5fcb8fe92c53872baa014/media/audio/pulse/pulse_output.cc
[modify] https://crrev.com/8726fa7e9fafe6969fc5fcb8fe92c53872baa014/media/audio/pulse/pulse_output.h
[modify] https://crrev.com/8726fa7e9fafe6969fc5fcb8fe92c53872baa014/media/audio/pulse/pulse_util.cc
[modify] https://crrev.com/8726fa7e9fafe6969fc5fcb8fe92c53872baa014/media/audio/pulse/pulse_util.h