Bug 397250

Summary: All slowmotion effects in project lost upon saving
Product: [Applications] kdenlive Reporter: Dominik Leiner <mail>
Component: Video Effects & TransitionsAssignee: Vincent PINON <vpinon>
Status: RESOLVED FIXED    
Severity: major CC: fritzibaby
Priority: NOR    
Version First Reported In: 18.04.1   
Target Milestone: ---   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Dominik Leiner 2018-08-07 20:44:39 UTC
I am working in a kdenlive project with lots of clips, and many of them have a "Speed" effect, often 300 to 1000%.

This worked fine for a while, but after a few hours of cutting and shifting clips, and adding and removing clips, I had all but few clips marked and shifted. Then kdenlive crashed, which is not very uncommon. When opening the last saved version, kdenlive told me that invalid transitions were removed. The reason for them getting invalid was that *all* "Speed" (slowmotion) effects were lost, which changed the clip duration, and caused overlaps.

I already had this issue in the previous AppImage (17.x) in a different project. Unfortunately, it again appeared in 18.04.1 now. My gut feeling is that it happens when moving a large number of clips on the timeline, but I was unable to deliberately trigger the bug so far.
Comment 1 Dominik Leiner 2018-08-07 20:48:25 UTC
I should add that the project (throughout many file versions) showed an alert about clip problems when loading, although the list of problems was void.

The system I run kdenlive on is an Ubuntu 16.04.
Comment 2 emohr 2018-08-08 18:40:26 UTC
I see many bugs/problems with the speed effect. If I remember correctly it has something to do with the actual code which will be not updated anymore (concentration is 100% on the refactoring version which will come out ca. Dec 18). Try with the upcoming version 18.08 ones released because there is an MLT 6.10.0 installed.

Maybe as workaround: keep your project in small portions. Render each small portion and stich the rendered files together afterwards.
Comment 3 Dominik Leiner 2018-08-13 11:32:38 UTC
> Try with the upcoming version 18.08 ones released because there is an MLT 6.10.0 installed.

Good point, thank you for that information.

Yes, I actually took a part that was heavily cut out of the project, and did the snipping in a separate kdenlive projekt. As I encountered the bug only after using very many clips, and cuts, and shifting, and the undo feature, I assume that it's actually a fault that occurs subsequent to some other issue causing problems in the file/project structure. Let's see what 18.08 brings :)
Comment 4 emohr 2019-01-01 19:25:27 UTC
The speed effect is completely new written in the refactoring version.

If you like you can test with the current Kdenlive_Nightly_Appimage: https://binary-factory.kde.org/job/Kdenlive_Nightly_Appimage_Build/lastSuccessfulBuild/artifact/
Comment 5 Bug Janitor Service 2019-01-16 04:33:11 UTC
Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
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If you have already provided the requested information, please
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Comment 6 Bug Janitor Service 2019-01-31 04:33:13 UTC
This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!
Comment 7 emohr 2019-04-25 15:12:18 UTC
The speed effect is solved with version 19.04.0.