Audio lag in AdobeFlash (games, not videos)

[NeLaS]

Binary package hint: pulseaudio

Audio lags behind graphics in flash games (e.g., http://jamlegend.com/), but not in flash video players (e.g., YouTube). I first noticed this in Intrepid, but I took a long time to think of PulseAudio as the culprit.

Seems that the lag is a bit more than half second. I'm not sure how widespread it is, but although I mainly tested with JamLegend, a few other flashgames were out of sync too. The problem went away after removing PulseAudio and installing OSSv4 instead (tried this on Ubuntu 8.10).

Possibly, it is just a matter of tweaking PulseAudio configuration, but I did not manage work it out.

--
$ lsb_release -rd
Description: Ubuntu 9.10
Release: 9.10

$ apt-cache policy pulseaudio
pulseaudio:
  Installed: 1:0.9.19-0ubuntu3
  Candidate: 1:0.9.19-0ubuntu3
  Version table:
 *** 1:0.9.19-0ubuntu3 0
        500 http://br.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status

[Daniel T Chen (crimsun)]

Is this symptom reproducible using the most current daily-live desktop Lucid image?

[Phil Krämer (man0riax)]

I'm using the very recent version of Ubuntu Lucid and that bug also occurred on my system when I tried to play JamLegend. The only possible solution was to install OSS4. However, this is just a simple workaround and I want my PulseAudio back as soon as possible. (:

[RS (rafales2)]

It is shm-related.

When lag appears, pause the game and type this in terminal:

/usr/bin/pulseaudio --cleanup-shm

And there is no lag again :)

[RS (rafales2)]

Hmm it's look like I had luck two times. It's not shm.

[NeLaS (organelas)]

Well, just for the record I tried in Lucid and the problem persists. shm did not work, indeed.

[Phil Krämer (man0riax)]

Bug does still occur in the very recent Ubuntu 10.10 beta, so I guess there have been no changes on PulseAudio.

[Mantas Kriaučiūnas (mantas)]

This pulseaudio bug was confirmed only with very old Ubuntu releases, could you test if audio still lags behind graphics in flash games (e.g., http://jamlegend.com/) with latest stable Ubuntu version - 12.04 ?

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu 9.10 (karmic) reached end-of-life on April 30, 2011.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

Please upgrade to the latest version and re-test.

[Launchpad Janitor (janitor)]

[Expired for pulseaudio (Ubuntu) because there has been no activity for 60 days.]