Bug 435974

Summary:	Transparent PNG not working with wipes
Product:	[Applications] kdenlive	Reporter:	Jürg Altwegg <msg>
Component:	Video Effects & Transitions	Assignee:	Vincent PINON <vpinon>
Status:	RESOLVED FIXED
Severity:	normal	CC:	julius.kuenzel, omeritzicschwartz
Priority:	NOR
Version First Reported In:	20.12.3
Target Milestone:	---
Platform:	Appimage
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Jürg Altwegg 2021-04-20 20:22:53 UTC

SUMMARY

Transparent PNG not working with wipes. It did work until version 20.12.1b

STEPS TO REPRODUCE
1. Import a PNG picture in top timeline
2. Import any movie, picture or color clip in the timelime below
3. Attach a wipe (i.e. dissolve) to the PNG
4. Check in preview monitor; the PNG fades in as expected
5. Render to MP4: The rendered file fades to white

OBSERVED RESULT
The rendered MP4-file fades to white; it seems that the alpha channel has not been used.


EXPECTED RESULT
Fade in of the PNG on top of the movie clip in the timeline below.


SOFTWARE/OS VERSIONS
Windows: -
macOS: -
Linux/KDE Plasma: Ubuntu 20.04 with Gnome
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 5.76.0
Qt Version:  5.14.2

ADDITIONAL INFORMATION
In earlier KDEnlive versions (until and including 20.12.1b) wipes with transparent PNG worked fine.

Comment 1 Omeritzics 2021-06-17 14:57:56 UTC

This bug happens in my Kdenlive installation too.

Comment 2 Julius Künzel 2022-07-02 11:56:57 UTC

Thanks for your report!

This is hopefully fixed in new versions. Please download the latest release and try again.

Please close this report if it is fixed or update the version of this report and set back the status to CONFIRMED

Comment 3 Bug Janitor Service 2022-07-17 04:36:42 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
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

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

Comment 4 Jürg Altwegg 2022-07-18 07:53:00 UTC

Thanks for asking back. It seems the bug is solved since several versions.
I can confirm that version 22.04.3 works as expected. Great!