Two different versions, two different render qualities

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1

I noticed that the render quality is lower in the latest versions.
The same project file was rendered with the same render settings using kdenlive 23-8-1 and 25-12-0-B.
The render file from version 23-8-1 is of higher quality than the one from version 25-12-0-B.
I am attaching it for those who want to examine the project file.
I’m curious about the solution to this issue.

System:

ASUS FX502VE Laptop

System: Windows 11
Processor: Intel i5-7300HQ CPU 2.5 GHz
RAM: 8 GB DDR4
System type: 64-bit operating system, x64-based processor
Graphics Card: Intel HD Graphics 630
Graphics Card: 4GB NVIDIA GeForce GTX 1050 Ti

Render parameters:

ab=192k acodec=aac ar=48000 channels=2 f=mp4 pix_fmt=yuv444p real_time=-1 threads=0 vb=8M vcodec=h264_nvenc

The following image was taken from rendered videos.

23-25
23-25367×282 42.8 KB

Render windows.
test-23-8-1
test-23-8-1675×722 80.7 KB

test-25-12-0-B
test-25-12-0-B634×887 96.1 KB

Rendered Videos

23-8-1

25-12-0-B

Project files: kdenlive test project files

2

Thanks for your detailed report. After investigating this, it seems that a change between Qt5 and Qt6 is causing this poor quality results in all Qt6 versions of Kdenlive. Still investigating but I have found a workaround and this should hopefully be solved in the coming weeks.

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