[Kdenlive-devel] Serious MLT audio bug - probably related to interlacing

[Jan Uhlir]

MLT bug probably related to latest interlacing support. Audio is TWICE as speed as video.
This affect both kdenlive playback in monitors and rendering to file.

Description:
When you watch rendered video clip audio stops exactly in the middle of movie.
Sound is choppy and somewhat "compressed" all human voices sound "clownish".
When playbacked in inigo or Kdenlive sound is very choppy, hardly listenable and even video jerking, choking and bursting again in waves.

Testing files:
http://espinosa.klenot.cz/videotest/test_beach_clip.kdenlive
http://espinosa.klenot.cz/videotest/test_beach_clip2.vob

Testset:
1/ playback in inigo
./inigo ~/video2/test_beach_clip.kdenlive

2/ render using inigo - plain
espinosa at esplaptop:~/build/kdenlive/bin> ./inigo ~/video2/test_beach_clip.kdenlive -consumer avformat:/home/espinosa/test2.vob real_time=0

3/ render using inigo - ildtc and ilme
espinosa at esplaptop:~/build/kdenlive/bin> ./inigo ~/video2/test_beach_clip.kdenlive -consumer avformat:/home/espinosa/test3.vob real_time=0 ildct=1 ilme=1
+-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+
|1=-10| |2= -5| |3= -2| |4= -1| |5=  0| |6=  1| |7=  2| |8=  5| |9= 10|
+-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+
No accelerated IMDCT transform found
Current Position:        297

Results:
All the same. Choppy "compressed" sound, audio finishes in the middle of playback.

-----------------

The old mlt 0.2.3  is OK
Tested on kdenlive (playback, render) and ingo (playback, render)
The same test set - everything OK. Not tested in HW DVD player - it is another story.

-----------------

This bug affects heavily both kdenlive playback (timeline monitor, clip monitor) and render.
See this bugreports:
http://www.kdenlive.org/bbforum/viewtopic.php?f=16&t=92
http://www.kdenlive.org/bbforum/viewtopic.php?f=16&t=16
http://www.kdenlive.org/bbforum/viewtopic.php?f=16&t=64
3 different reporters encountered this problem