Ubuntu
avidemux package

Playback of MPEG2 files extremely choppy

Bug #472352 reported by Sebastian Kapfer
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Avidemux
New
Undecided
Unassigned
avidemux (Ubuntu)
Triaged
Low
Unassigned

Bug Description

Binary package hint: avidemux

I tried opening a MPEG2 program stream (recorded from DVB-T). This worked find with previous versions of avidemux-gtk (hardy that is). After indexing, avidemux could play & seek in the file. Now playback is choppy, seeking does not work.

Video output is Xv, audio is SDL. Seeking does not work in still picture mode either, so I guess it's a backend issue.

Affects both the Qt and GTK2 frontend. Can provide sample file if helpful.

Revision history for this message
Alessio Treglia (quadrispro) wrote :

http://avidemux.org/admForum/viewtopic.php?id=7113

Changed in avidemux (Ubuntu):
importance: Undecided → Low
status: New → Triaged
Revision history for this message
Alessio Treglia (quadrispro) wrote :

Please attach a sample file.

Revision history for this message
M.D. (marc.dejardin) wrote :

Hello
I have posted a comment in December on the avidemux forum related to the same problem :
The problem, seen in version 2.5, can be reproduced with avidemux 2.4 if you check the box
"use libavcodec MPEG-2 decoder" in the "input" tab of preferences,

So the problem is located in libavcodec.
Version 2.4 was using libmpeg2.
The point is that in 2.5 version, there is no possibility to uncheck the libavcadec MPEG-2 decoder ...

I would rise the importance of this bug since it forbids any treatment of dvb-t streams (at least in France) using avidemux.

A workaround is to use mencoder to translate the avi file in mpeg file :
mencoder -oac copy -ovc copy -of mpeg -o my_file.mpeg my_file.avi
Then avidemux is happy despite the fact that in general sound and video are no more synchronous...

Revision history for this message
Alessio Treglia (quadrispro) wrote :

Please add a post here:
http://avidemux.org/admForum/viewtopic.php?id=7113

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