Bug 491072

Summary:	1-channel wav (mono) audio is only played back on the left channel.
Product:	[Applications] kdenlive	Reporter:	diekuhrannte <diekuhrannte>
Component:	Audio Effects & Transitions	Assignee:	Jean-Baptiste Mardelle <jb>
Status:	RESOLVED FIXED
Severity:	normal	CC:	fritzibaby
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description diekuhrannte@web.de 2024-07-31 17:01:43 UTC

***
If you're not sure this is actually a bug, instead post about it at https://discuss.kde.org

If you're reporting a crash, attach a backtrace with debug symbols; see https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***

SUMMARY


STEPS TO REPRODUCE
einfügen eines 1-kanal wav audio in die Timeline
Wiedergabe nur im linken Kanal bei einem Stereo-Projekt
All mono or 1-channel audio files (ac3, flac, m4a, mp2, mp3 and ogg) behave normally, i.e. they are played back as files in Kdenlive in both channels.


OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Linux/Xfce 
Qt6 

ADDITIONAL INFORMATION
Shotcut has the same problem and this will be corrected in the next version.
https://forum.shotcut.org/t/v24-06-26-audio-quality-loss-for-wav-files/45183/2

Comment 1 diekuhrannte@web.de 2024-07-31 19:16:14 UTC

STEPS TO REPRODUCE
sorry, here in English:
Inserting a 1-channel wav audio into the timeline Playback only in the left channel in a stereo project.
All other mono or 1-channel audio files (ac3, flac, m4a, mp2, mp3 and ogg) behave normally, i.e. they are played back as files in Kdenlive in both channels.

Comment 2 diekuhrannte@web.de 2024-08-01 09:32:09 UTC

The problem only appeared with the Manjaro update a few weeks ago. The latest version of Kdenlive does not have the problems when I revert the Linux updates (with timeshift). 
However, the AppImage 24.05.2 has no problems with all current updates, but the Flatpak does.

The problem seems to be caused by mbedtls2.
When I do the upcoming updates, ffmpeg, ffmpeg4.4, libplacebo, mlt, mpv, x265
mbedtls2 is also installed, then mono is only played on the left. The problem is also with older Kdenlive versions and not only with the latest one.

Comment 3 diekuhrannte@web.de 2024-08-01 15:18:24 UTC

For your information:
All AppImages no problems.
Flatpak: the current versions cause this problem, the old versions up to 24.02.2 no problem with the mono wave files.