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IDProjectCategoryView StatusDate SubmittedLast Update
0001551KdenliveMLTpublic2010-04-11 08:392010-05-04 17:24
Reporterfoobar123 
Assigned To 
PrioritynormalSeveritymajorReproducibilityalways
StatusacknowledgedResolutionopen 
Platform32 bit intel and alikeOSKubuntu LinuxOS Version9.10
Product VersionRecent git 
Target VersionFixed in Version 
Summary0001551: Audio desynchronizes when "Crop From Start" is used
Description - Generated an OGV file with Kdenlive's screen capture feature
 - Added the clip to a track
 - Cropped away the first few seconds

When the project is played back, at first the audio is out of sync - it is as if only the video had been cropped, but not the audio, so the audio is "late". Also, audio pops and crackles, and is played back too fast. Some time later, audio syncs again.

The broken audio is exported also to rendered files, so it is not a playback problem of the Project Monitor.

Cropping clips of other file formats seems to work fine, so the first thing I tried was transcoding the clip to another format - which led me to bug 0001549 "Crash when loading Lossless Matroska clip"... (Which I reported first because a crash is probably more severe than an audio de-sync problem.)

I've uploaded example files here because the upload function doesn't let me upload files.
http://tumbetoene.tuxfamily.org/temp/kdenlive/kdenlive-ogv-audio-desync.tar.bz2 [^]
TagsNo tags attached.
Build/Install MethodDistribution package
Attached Files

- Relationships
related to 0000618closedddennedy When rendering one clip does not become visible until 5 seonds after clip starts 
related to 0000619closedLeHomard after adjusting the video boundary, audio 'shifts' with the boundary so the same audio is played in different part of timeline 

-  Notes
(0005013)
foobar123 (reporter)
2010-04-11 08:42
edited on: 2010-04-11 08:44

Sorry for reporting the same bug twice - there was an error message so I assumed it hadn't been posted. You can delete #0001550.

(0005043)
LeHomard (developer)
2010-04-18 18:59

Acknowledged on latest svn, using the provided files : the sound starts slightly late and is sped up (wich also distorts it) for a few seconds before getting back into sync with the right speed.

First time I've comme across the problem, probably only happens for Theora/Vorbis files (maybe only a problem with Vorbis ?)
(0005086)
ddennedy (developer)
2010-05-01 07:30

Seeking on Theora is known to be problematic in FFmpeg. There is nothing we can do unless it is fixed there or someone creates some other provider in MLT.

- Issue History
Date Modified Username Field Change
2010-04-11 08:39 foobar123 New Issue
2010-04-11 08:42 foobar123 Note Added: 0005013
2010-04-11 08:43 foobar123 Note Edited: 0005013 View Revisions
2010-04-11 08:44 foobar123 Note Edited: 0005013 View Revisions
2010-04-18 18:59 LeHomard Note Added: 0005043
2010-04-18 18:59 LeHomard Status new => acknowledged
2010-04-18 19:01 LeHomard Relationship added related to 0000619
2010-05-01 07:30 ddennedy Note Added: 0005086
2010-05-04 17:24 ddennedy Relationship added related to 0000618


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