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IDProjectCategoryView StatusDate SubmittedLast Update
0002745KdenliveMLTpublic2012-09-20 15:112012-09-24 10:06
Assigned Toj-b-m 
Platform64 bitOSKubuntuOS Version11.10
Product Version0.9.2 
Target VersionFixed in Version 
Summary0002745: Very slow seeking with big files

I'm trying to edit some 3 hours WebM files (640x360 @ 24 fps).

Seeking a is OK *around the beginning* of the clip but become slower as I go later in it, more and more slower when going to the end...

Practically, I click in the time bar, say at 2:30:00, the playback stops, a kdenlive thread take 100% of a core during 4 or 5 mn and start again. As the bug happens also on transitions, it nearly impossible to work.

BUT, this bug doesn't exist in Kdenlive 0.8-4 !!
Steps To Reproduce1. Add a long WebM clip like this one: [^]

2. go to 0:02:00, play, wait for 0.1s, then playback :)
3. go to 2:30:00, play, wait for 6s + hard CPU load, then playback :(

Additional InformationI repeat, I don't have this bug using Kdenlive 0.8-4 !
TagsNo tags attached.
Build/Install Method3rd party package
Attached Files

- Relationships

-  Notes
eddrog (developer)
2012-09-22 13:16

I can reproduce it.
j-b-m (administrator)
2012-09-22 18:22

Seems to be an MLT issue. I can reproduce using melt. Seeking delay is quickly growing when approaching one hour.

Seeking with avplay works fine, so it is probably a problem in MLT. You can always try to convert your file to a more commonly used video format (in Kdenlive, right click on the clip and transcode > dnxhd). Maybe that will improve seeking.
yomguy (reporter)
2012-09-24 10:04

Thanks for applying.

For the moment, I use 0.8 on Kubuntu 11.10 which depends on libmlt4 (0.7.4) and is really fine for my work even on big files. But, if I can help to fix this, I can compile and test some patch (sorry I'm a python dev, not qt nor c++)..
yomguy (reporter)
2012-09-24 10:06

One more thing: Kdenlive really rocks!! Kudos to the dev team ;)

- Issue History
Date Modified Username Field Change
2012-09-20 15:11 yomguy New Issue
2012-09-22 13:16 eddrog Note Added: 0008368
2012-09-22 18:22 j-b-m Note Added: 0008375
2012-09-22 18:22 j-b-m Assigned To => j-b-m
2012-09-22 18:22 j-b-m Status new => acknowledged
2012-09-22 18:23 j-b-m Category User Interface => MLT
2012-09-24 10:04 yomguy Note Added: 0008386
2012-09-24 10:06 yomguy Note Added: 0008387

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