Playback of MPEG2 files extremely choppy

[Sebastian Kapfer]

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.

[Alessio Treglia (quadrispro)]

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

[Alessio Treglia (quadrispro)]

Please attach a sample file.

[M.D. (marc.dejardin)]

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...

[Alessio Treglia (quadrispro)]

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