[pulseaudio-tickets] [Bug 94804] New: Major audio-video sync and audio dropout problems when using Intel HDMI audio

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94804

            Bug ID: 94804
           Summary: Major audio-video sync and audio dropout problems when
                    using Intel HDMI audio
           Product: PulseAudio
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: alsa
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: hancockrwd at gmail.com
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

I've got a machine using Intel Haswell integrated video with the HDMI1 output
connected to a monitor and HDMI2 connected to a Yamaha RX-V577 AV receiver
which is connected to a TV. This is using Fedora 23 and
pulseaudio-7.1-1.fc23.x86_64.

Whenever I have the audio output routed to "HDMI/DisplayPort 2" and try to play
a video in Firefox or Totem, the video appears to run too fast and the audio
becomes up to several seconds behind the video. The audio also keeps playing
for several seconds when pausing the video. When playing a video file in VLC,
it doesn't lose sync as much, but the audio cuts in and out, and in the VLC
debug log it has lots of complaints like this:

pulse debug: changing sink 2: alsa_output.pci-0000_00_03.0.hdmi-surround-extra1
(Built-in Audio Digital Surround 5.1 (HDMI 2))
pulse debug: started
core warning: picture is too late to be displayed (missing 25 ms)
core debug: picture might be displayed late (missing 13 ms)
core warning: playback way too early (-121209): playing silence
core debug: inserting 5818 zeroes
core warning: playback too early (-40158): down-sampling
core warning: timing screwed (drift: -81704 us): stopping resampling
core warning: playback too early (-82366): down-sampling
core warning: playback way too early (-121032): playing silence
core debug: inserting 5809 zeroes
core debug: auto hiding mouse cursor
core warning: playback too early (-40230): down-sampling
core debug: auto hiding mouse cursor
core warning: timing screwed (drift: -80762 us): stopping resampling
core warning: playback too early (-81447): down-sampling
core warning: playback way too early (-120541): playing silence
core debug: inserting 5785 zeroes

VLC's audio output appears to work properly if I run VLC under pasuspender and
configure it to use ALSA audio output instead, so it seems like this is a
PulseAudio problem.

Not sure what more to do to debug this. I can provide more info if needed.

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