Ticket #51 (closed defect: fixed)

Opened 10 months ago

Last modified 6 months ago

playing multiple files simultaneously causes audio glitches

Reported by: taranaki Assigned to: gbooker
Priority: normal Milestone:
Component: a52codec Version: 1.7.6
Severity: normal Keywords:
Cc:

Description

1. Disable "Play sound in frontmost player only" setting in QuickTime preferences.
2. Open several .ac3 files in QuickTime (I can reliably reproduce this with five).
3a. Quickly play all files and you may hear an audio glitch scratching record sound.
3b. While the files are playing, seek to the beginning of them and periodically you will hear the same glitch.

This issue occurs using a build created from the latest source (At revision 61).

Change History

02/06/08 19:59:04 changed by gbooker

  • status changed from new to closed.
  • resolution set to invalid.

Sounds more like clipping which can occur if you sum of the audio from multiple sources. You can't expect 5 sources with a certain dynamic range to sum up to a signal with the same dynamic range.

02/11/08 12:17:53 changed by taranaki

This bug was definitely not related to clipping of multiple sources. In fact, I could reproduce it using five copies of the same source, or even by opening a single copy multiple times (using the QuickTime API).

Furthermore, I have been able to fix the bug by updating the version of liba52 included in a52codec.

02/28/08 13:49:33 changed by gbooker

  • resolution changed from invalid to fixed.

(In [63]) Updated the liba52 lib (they switched to svn in some other location and didn't update any of the pointers on the sf site).

Fixes #51