Bug 432621

Summary: Big problems in rendered video
Product: [Applications] kdenlive Reporter: Roxane <roxane.petrot>
Component: Rendering & ExportAssignee: Jean-Baptiste Mardelle <jb>
Status: RESOLVED FIXED    
Severity: normal CC: fritzibaby
Priority: NOR    
Version First Reported In: 20.12.0   
Target Milestone: ---   
Platform: Debian unstable   
OS: Linux   
Latest Commit: Version Fixed/Implemented In: 20.12.2
Sentry Crash Report:

Description Roxane 2021-02-07 19:59:18 UTC 
SUMMARY
I don't even know how to describe this so I made a quick video (link at the end)
Basically, I made a video on the 20.12 appimage with a few tracks and effects. There's some chroma key, rotoscoping, bézier curves, key spill mop up, flippo & speed change. When i edit and pre-render, everything looks fine, but after rendering it's a mess. I rendered in mp4 with and without parallel processing, nothing worked.

So here's the video, first is the rendered failure, second is the slighlty choppy prerender, and last is a screenshot of the effects on one clip, they pretty much all have the same ones : https://youtu.be/rOw4eBGxr4E

STEPS TO REPRODUCE
1. 
2. 
3. 

OBSERVED RESULT


EXPECTED RESULT


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

ADDITIONAL INFORMATION
Comment 1 Jean-Baptiste Mardelle 2021-02-07 20:47:40 UTC 
can you try the 20.12.2 Appimage? We solved a bug that looks like yours in this version:
https://download.kde.org/stable/kdenlive/20.12/linux/kdenlive-20.12.2-x86_64.appimage.mmirrorlist
This version will be publicly announced tomorrow....
Comment 2 Roxane 2021-02-07 21:05:15 UTC 
(comment written minutes before yours)
After spending more time to try to render this thing, i figured out that the weird white grain seen at the beginning is because of the bézier curves, and that there were some issues with the speeds (showing wrong parts of the clip eg my finger, but the actually clip on the timeline starts after that). When taking a speed-less clip and copying the effect minus the bézier curves, it rendered fine

(after trying that new version)
It worked perfectly! thank you so much
Comment 3 emohr 2021-02-13 20:13:16 UTC 
Thank you for the feedback Roxane. Glad to hear it works. 

We close this bug. If it still appears in the latest version, please feel free to re-open it and update the affected version number.