Bug 421631

Summary:	Jerk of flicker in video when use video stab and change speed
Product:	[Applications] kdenlive	Reporter:	Truk <kurt.staubli>
Component:	Rendering & Export	Assignee:	Jean-Baptiste Mardelle <jb>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	berndmj, cgiraud
Priority:	NOR
Version First Reported In:	20.04.1
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Truk 2020-05-16 18:00:56 UTC

STEPS TO REPRODUCE
1. Apply Clip Jobs > Stabilize (vidstab)
2. Drag the video to the timeline
3. Cut Video to several parts with scissor
4. Change speed on each part to a different speed. Change of speed is between 20 to 50 percent. Speed may increase or decrease.
5. Put the video together so there is no pause

OBSERVED RESULT
In preview and in rendered video you will see around the cut (change of speed) a jerk or flicker. If you omit step 1 (vidstab) there is no jerk. The video is smooth.

EXPECTED RESULT
No jerk in any case.

SOFTWARE/OS VERSIONS
Linux Ubuntu 19.10 
kdenlive-20.04.1b-x86_64.appimage
same with previous version 20.04.0b

Comment 1 Cyril Giraud 2021-08-30 20:05:21 UTC

Linux Ubuntu Studio 20.04.3 LTS
Kdenlive 21.08.0 (thanks to kdenlive's ppa)

Probably the same bug observed, but with another way TO REPRODUCE:
0.a. Move a video to project
0.b. Select a little part of the video in clip monitor
0.c. Move selected part in project sources
1. Apply Clip Jobs > Stabilize to "zone 1"
2. Drag stabilized video to timeline
4. Change video speed to 50% in timeline (that becomes twice longer)

OBSERVED RESULT:
. Video speed in full speed, not 50%
. Video continues after selected zone

EXPECTED RESULT:
. Video 50% speed for selected clip zone 1

Please, set bug as confirmed.

Comment 2 Cyril Giraud 2021-08-30 20:46:16 UTC

Same problem with kdenlive-21.08.0a-x86_64.appimage

Comment 3 Bernd 2024-12-23 19:57:50 UTC

Hi and thank you for your patience.

Can you please check whether this issue still exists in the latest version 24.12.0?

If yes, please update this report to reflect the new version.

If it works now like you expect it would, you may change the status of this report to RESOLVED - FIXED.

At any rate, this report will be closed if there is no activity for the next 30 days.

Comment 4 Bug Janitor Service 2025-01-07 03:47:27 UTC

🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!

Comment 5 Bug Janitor Service 2025-01-22 03:47:46 UTC

🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.