https://bugs.kde.org/show_bug.cgi?id=525226
Bug ID: 525226
Summary: Flatpak: NVIDIA transcode fails with 'Unrecognized
option vsync' (FFmpeg 9.0.1)
Classification: Applications
Product: kdenlive
Version First 26.08.0
Reported In:
Platform: Flatpak
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Project Bin & Import
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
DESCRIPTION
I'm trying to edit an OBS recording in Kdenlive 26.08.0. When I try to create a
proxy, I get 'Failed to create proxy clip' and a popup saying the clip has a
variable frame rate. I click Transcode with 'Lossy x264 I frame only (NVidia
GPU)' selected, but that fails too.
STEPS TO REPRODUCE
1. Import an OBS MP4 recording. Mine is H.265 Main Profile, 2560 x 1440,
reported as 60 fps, with AAC audio at 48 kHz.
2. Try to create a proxy. Kdenlive reports a failure and offers to transcode
the clip because it detects variable frame rate.
3. Choose 'Lossy x264 I frame only (NVidia GPU)' and click Transcode.
OBSERVED RESULT
The conversion fails with:
Unrecognized option 'vsync'.
Error splitting the argument list: Option not found
EXPECTED RESULT
The supplied transcode preset should work with the FFmpeg version bundled with
Kdenlive.
SOFTWARE/OS VERSIONS
Linux, x86_64
Kdenlive: 26.08.0
Installation: system-wide Flatpak from Flathub (org.kde.kdenlive, stable)
Bundled FFmpeg: 9.0.1
Flatpak runtime: org.kde.Platform/x86_64/6.10
Installed Flatpak commit:
3441362f4cd592e4e492ffe4f5c90f23898c30280a959e9eb290161b51cddeec
The commit description is 'Update FFmpeg to v9.0.1', dated 29 August 2026.
ADDITIONAL INFORMATION
Checking the files inside the Flatpak shows that
/app/share/kdenlive/kdenlivetranscodingrc still has '-vsync 0' in the NVIDIA
transcode presets. /app/share/kdenlive/encodingprofiles.rc also has '-vsync 1'
in several proxy presets. These appear to be incompatible with the bundled
FFmpeg.
I haven't confirmed whether the initial proxy failure has the same cause, as
the error above is from the transcode log. I also haven't tested a corrected
preset yet.
This looks like the same issue reported in bug 524882; I'm seeing it in the
Flathub build of 26.08.0.
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