Bug 409928

Summary:	Reversing a clip changes in/out points [incorrectly]
Product:	[Applications] kdenlive	Reporter:	kdebugs
Component:	User Interface & Miscellaneous	Assignee:	Jean-Baptiste Mardelle <jb>
Status:	RESOLVED FIXED
Severity:	normal	CC:	fritzibaby, julius.kuenzel
Priority:	NOR	Flags:	fritzibaby: timeline_corruption+
Version First Reported In:	19.04.3
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:	21.04
Sentry Crash Report:

Description kdebugs 2019-07-18 03:49:27 UTC

SUMMARY
When reversing a clip, the [new] clip has a completely different range.

STEPS TO REPRODUCE
1. Create a project
2. Add a clip
3. Insert clip in timeline; set in/out points to a portion of the clip that is not symmetric about the middle of the clip.
4. Reverse the clip
5. Playback

OBSERVED RESULT
Playback plays the clip in reverse, but between two completely different frames than the in/out points established in step 3.

EXPECTED RESULT
Clip playback is reversed between selected frames (in/out points).


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: appimage
KDE Frameworks Version: appimage
Qt Version: appimage

ADDITIONAL INFORMATION
It *appears* that the in/out points for the reversed clip are not being calculated correctly.  I have not done the math to verify this, but what *seems* to be happening is:

Clip has range of frames 0 to 99.
Insert clip into timeline; set in point to frame 11 and out point to frame 25.
Reverse clip.
Reversed clip now has in point at frame 11 FROM THE END and out point at frame 25 FROM THE END.

That is, the reversed clip plays from frame (99 - 11) through frame (99 - 25).  In reverse, as expected.

Comment 1 emohr 2021-03-04 19:22:47 UTC

As it has been a while since this was reported, can you please test and confirm if this issue is still occurring or if this bug report can be marked as resolved.

Please try with the current Kdenlive AppImage version 20.12.2  https://download.kde.org/stable/kdenlive/20.12/linux/

Comment 2 Julius Künzel 2021-04-02 23:13:46 UTC

Setting to NEEDSINFO (see comment above)

Comment 3 kdebugs 2021-04-03 01:54:50 UTC

can't test.
no longer use kdenlive.

best of luck.