Bug 444283

Summary:	Time remap feature works in project monitor, but renders black (Windows)
Product:	[Applications] kdenlive	Reporter:	Dan Thompson <dan_j_thompson>
Component:	Rendering & Export	Assignee:	Jean-Baptiste Mardelle <jb>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	fritzibaby, guillo.far
Priority:	NOR	Keywords:	triaged
Version First Reported In:	21.08.2	Flags:	fritzibaby: Backport+
Target Milestone:	---
Platform:	Microsoft Windows
OS:	Microsoft Windows
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Dan Thompson 2021-10-23 16:57:06 UTC

SUMMARY
The "time remap" feature appears to work in the project monitor, but when the time-remapped video is rendered, I just get blackness.

STEPS TO REPRODUCE
1. Start kdenlive.exe, standalone 21.08.2 version.
2. Project -> Generators -> Counter; save the clip somewhere.
3. Drag clip to timeline; verify it works in project monitor.
4. Right-click on the clip in the timeline, select "time remap".
5. Add a few keyframes, speeding the clip up, and then back down to 100%.
6. Verify the playback is altered as expected in the project monitor.
7. Click "render", choose MP4-H264/AAC, choose the path, click "render to file".
8. View the rendered video.

EXPECTED RESULT
I should see the counter clip play, with speed altered by step 5.

OBSERVED RESULT
The rendered video appears to be the correct length (shorter than the original, un-time-remapped clip), but it's just a black square.

"About" says using MLT version 7.1.0. Libraries tab says KDE Frameworks 5.86.0; Qt 5.15.2; the *windows* windowing system.

SOFTWARE/OS VERSIONS
Windows: 11
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
I have two monitors; one is high-DPI (4k, set to 150%).

Comment 1 Guillermo 2021-12-19 15:00:52 UTC

Same here, but in Ubuntu Linux. 

Tried to export in several codecs h264, webm, mpeg2, with same result. 
Kidenlive 21.12, 
MLT version 7.2.0

Comment 2 emohr 2021-12-25 13:54:12 UTC

Thank you for reporting. I can confirm the issue, following your steps. After rendering the clip show "invalid" and it's only 122kB in size.

Comment 3 emohr 2025-01-04 16:43:50 UTC

I cannot reproduce the issue anymore. Using version 24.12.0

Please try with the current Kdenlive version 24.12.0 to see if the issue is fixed https://kdenlive.org/en/download/

Comment 4 Bug Janitor Service 2025-01-19 03:47:35 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 2025-02-03 03:47:03 UTC

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