SUMMARY STEPS TO REPRODUCE 1. Take video rotated on 90 degrees 2. Choose rotate effect and rotate on +-90 degreed 3. swicth playback on preview (on high quality works correctly OBSERVED RESULT video is rotated but cropped by old size limits. EXPECTED RESULT video should be rotated and preview whole without crop. SOFTWARE/OS VERSIONS Windows: MacOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION here is video capture how it looks like https://www.dropbox.com/s/kjirst7jnu0arl1/kdenlive_bug_rotation_preview.mkv?dl=0
Some effects work on “High Quality” only. Set "high quality" as default. More info here: https://kdenlive.org/en/project/timeline-track-compositing/
*** Bug 403327 has been marked as a duplicate of this bug. ***
Thanks for your report, we are aware of it and are tracking this issue here: https://invent.kde.org/multimedia/kdenlive/-/issues/649