Bug 443210

Summary:	Shape Alpha (Mask) Effect regulating audio volume
Product:	[Applications] kdenlive	Reporter:	Dominik Kummer <admin>
Component:	Audio Effects & Transitions	Assignee:	Vincent PINON <vpinon>
Status:	RESOLVED FIXED
Severity:	normal	CC:	ddixon, jb, josephlegrand33, markng
Priority:	NOR
Version First Reported In:	24.02.2
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:	24.12.0
Sentry Crash Report:

Description Dominik Kummer 2021-10-01 22:55:04 UTC

Sometimes Shape Alpha Effect treshold value does regulate the audio volume.


STEPS TO REPRODUCE
1. Add audio+video track
2. add shape alpha effect to video track
3. set treshold to lower value

OBSERVED RESULT
Audio volume is changed

EXPECTED RESULT
Only luma value treshold should be changed

Comment 1 Dave Dixon 2021-11-26 18:50:15 UTC

I don't have any speed-ups, but I am using Alpha Shapes for the first time. I don't have to save it for the timeline to get messed up. When I render it, some clips move forward in time, even though they're correct in the editor. Then, when I save and reload it, a lot of spaces are collapsed. So the timeline is completely messed up. 

Another clue: There are video only tracks (still images, mostly) and audio tracks (voiceover) and one grouped pair of audio/video tracks that came in as an mp4. After saving, the a/v tracks are ungrouped, and the video segments are shifted forward over any empty space in that track, but the audio track is in exactly the right place!

kdenlive-21.08.3-x86_64.appimage on Ubuntu 20.04

Comment 2 Dave Dixon 2021-11-26 18:57:03 UTC

Sorry, I meant to put this https://bugs.kde.org/show_bug.cgi?id=445644  

What I'm seeing is that all other effects are messed up or ignored when using alpha shapes. Fade in / fade out are ignored, and transform keyframes are ignored if transform comes before alpha shapes, and keyframes are distorted if transform comes after alpha shapes.

Comment 3 markng 2023-03-08 16:48:42 UTC

Experiencing the same issue (audio volume changed by Shape Alpha Masks's threshold option), is there a work around?

Comment 4 Léo 2024-02-24 12:58:50 UTC

I confirm that I face the same bug. I spent quite a few hours debugging why my render had such a low audio volume, but I didn't suspect the Alpha Shape effect at all! This is very weird and I would be interested in a workaround if anyone have found one in the meantime.

Comment 5 Dominik Kummer 2024-05-02 14:12:36 UTC

Is anyone still facing this bug with the latest version of Kdenlive?

Comment 6 Léo 2024-05-13 07:28:33 UTC

(In reply to Dominik Kummer from comment #5)
> Is anyone still facing this bug with the latest version of Kdenlive?

Issue still present in the latest sable version (24.02.2), as well as in the latest experimental (kdenlive-master-8165-linux-gcc-x86_64.AppImage from 2024-05-12 20:11).

Comment 7 Jean-Baptiste Mardelle 2025-02-17 12:37:40 UTC

Thanks for your report. This was fixed in the 24.12 version with this commit:
https://invent.kde.org/multimedia/kdenlive/-/commit/0e8f40e7886b9d99e6d11dfcb3ce28415fdd30d4