https://bugs.kde.org/show_bug.cgi?id=492708
Bug ID: 492708
Summary: SVT-AV1 (libsvtav1) doesn't take the value for
CRF/qscale
Classification: Applications
Product: kdenlive
Version: 24.08.0
Platform: Flatpak
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Video Display & Export
Assignee: j...@kdenlive.org
Reporter: edu.rm...@gmail.com
Target Milestone: ---
SUMMARY
Hi, I use SVT-AV1 to make smaller videos for Odysee, specially gameplays, but
since the previous Kdenlive version, the app doesn't take the value set for
CRF/qscale, so the resultant video always takes up the same amount of space.
I tried with the default config for AV1 changing from AOM-AV1 to SVT-AV1 and I
have the same result. I'm used to set the CRF to 42 or higher (lower quality)
to make the video as small as possible within a decent visual quality.
STEPS TO REPRODUCE
1. Make a video with Kdenlive.
2. Try to set a different value for CRF for SVT-AV1, mainly if the value is
higher than 31 (lower quality). Yo have to set that with a custom render
profile.
3. You see that resultant videos always take up the same amount of disk space.
I use the Flatpak version of Kdenlive because I use Aeon Desktop as operating
system. I don't use parallel processing with SVT-AV1.
I share two examples of the presets I use for rendering with SVT-AV1.
EXAMPLE 1:
ab=128k acodec=libopus bf=3 channels=2 cpu-used=8 f=webm g=300 qscale=31
real_time=-1 row-mt=1 strict=experimental threads=15 tile-columns=2 tile-rows=1
vbr=off vcodec=libsvtav1
EXAMPLE 2:
ab=128k acodec=libopus bf=3 channels=2 cpu-used=8 f=webm g=300 qscale=31
real_time=-1 row-mt=1 strict=experimental threads=15 tile-columns=2 tile-rows=1
vbr=off vcodec=libsvtav1
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