https://bugs.kde.org/show_bug.cgi?id=507333
Bug ID: 507333
Summary: AV1 export is corrupted if the source clip interlacing
doesn't match the encoding interlacing settings
Classification: Applications
Product: kdenlive
Version First 25.04.4
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Rendering & Export
Assignee: j...@kdenlive.org
Reporter: richardash1...@yahoo.co.uk
Target Milestone: ---
SUMMARY
Exporting an interlaced source clip (1080i25) to AV1 produces a corrupted video
file, unless the AV1 render preset is modified to set the scanning as
interlaced and top field first (i.e. matching the source clip).
This works fine with h264 in any combination.
The codec being used is svt-av1, by editing the preset to change the ffmpeg
codec.
STEPS TO REPRODUCE
1. Create a new project, either 1080i25 or 1080p50.
2. Load a 1080i25 video clip, like this one (5 seconds, 16MB, direct from
camera):
https://1drv.ms/v/c/4b232a568ba3cb04/ERc5p230VcVFm65zV0NN8KYBd9rU5Ek0acIDlILk8r9Liw?e=gEKH0U
3. Render using an AV1 preset with the scanning not set, or set to progressive.
whether the project is set to 1080i25 or 1080p50, unless the AV1 render preset
is modified to set the scanning as interlaced and top field first (i.e.
matching the source clip). It then doesn't matter whether the project is set to
1080i25 or 1080p50, both render correctly (except that I wanted progressive
video!).
2.
3.
OBSERVED RESULT
Video is heavily corrupted, e.g. this still:
https://1drv.ms/i/c/4b232a568ba3cb04/EYSIc7dvPthKoRnmJVa4xcgB5xGg-Ol2OG4Kabp6eRXvTA?e=vmo8pc
EXPECTED RESULT
Video render looks like the timeline playback.
SOFTWARE/OS VERSIONS
Linux, reproduces natively in Gentoo or by running the 25.04.03 Flatpack.
Linux/KDE Plasma:
KDE Plasma Version: kde-plasma/libplasma-6.3.5
KDE Frameworks Version: kde-frameworks/frameworkintegration-6.13.0/
Qt Version: dev-qt/qtbase-6.9.1-r2
media-video/ffmpeg-7.1.1-r2
media-libs/mlt-7.32.0
media-libs/libaom-3.10.0
media-libs/svt-av1-3.0.2
ADDITIONAL INFORMATION
Test files to reproduce this, and examples of rendered files, can be found
here:
https://1drv.ms/f/c/4b232a568ba3cb04/EmkyObMXIgNBpTn4C6VMjRUBEb-4-fmqegVXRicmWgPRMw?e=HOVxUw
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