Ubuntu
xine-lib package

Libavcodec has been miscompiled in xine-ffmpeg?

Bug #89537 reported by Sitsofe Wheeler
2
Affects Status Importance Assigned to Milestone
xine-lib (Ubuntu)
Fix Released
Medium
Reinhard Tartler

Bug Description

Description of the problem:
When playing any video through xine-ui that uses ffmpeg a warning is printed on the console.

Steps to reproduce:
(with xine-ui installed)
1. Start a gnome-terminal .
2. Within it run
xine 'http://download.gametrailers.com/gt_vault/t_cc3tw_domination_gp_gt.wmv'

Expected results:
Video to play.

Actual results:
Video plays but a warning is printed on the terminal:
$ xine 'http://download.gametrailers.com/gt_vault/t_cc3tw_domination_gp_gt.wmv'
This is xine (X11 gui) - a free video player v0.99.5cvs.
(c) 2000-2006 The xine Team.
Compiler did not align stack variables. Libavcodec has been miscompiled
and may be very slow or crash. This is not a bug in libavcodec,
but in the compiler. Do not report crashes to FFmpeg developers.

Version information:
Ubuntu Feisty
libxine1 1.1.4-1ubuntu3
libxine1-ffmpeg 1.1.4-1ubuntu3
xine-ui 0.99.4+dfsg+cvs20061111-2ubuntu1

Related branches

lp:debian/squeeze/xine-lib
Revision history for this message
Reinhard Tartler (siretart) wrote :

well, it's a bit more complicated. xine is compiling ffmpeg as always, but the included copy of ffmpeg now has a check for variable alignment on the stack, which xine disables. I have committed a patch upstream which disables stack alignment. we should probably get this in ubuntu as well, or even better: update the ffmpeg copy and use that.

Changed in xine-lib:
assignee: nobody → siretart
status: Unconfirmed → In Progress
importance: Undecided → Medium
Reinhard Tartler (siretart)
Changed in xine-lib:
status: In Progress → Fix Committed
Revision history for this message
Sitsofe Wheeler (sitsofe) wrote :

Let me just make sure I'm understanding this correctly - your patch disables the warning message ffmpeg does because the warning is spurious?

Revision history for this message
Sitsofe Wheeler (sitsofe) wrote :

Forget the last comment - the changelog makes it perfectly clear:

Don't compile xine with -mpreferred-stack-boundary=2, because ffmpeg expects the stack to be aligned. Patch already aplied Upstream.

Revision history for this message
Reinhard Tartler (siretart) wrote :

built sucessfully on all archs

Changed in xine-lib:
status: Fix Committed → Fix Released
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