STEPS TO REPRODUCE 1. Add effect 2. Set X Size value OBSERVED RESULT Blurs X and Y axis. EXPECTED RESULT Blur only X axis (as lke as "Y Size" does). SOFTWARE/OS VERSIONS Windows: 7 ADDITIONAL INFORMATION Decide if you wanna capitalise property names or not: "X Size" vs "Y size" (see different cap. in "size")
Average Blur is a filter provided by avfilter. Seems like this is expected behavior based on the documentation: https://ffmpeg.org/ffmpeg-filters.html#avgblur I'm going to mark this as not a bug unless there's something you think we should do for Kdenlive specifically.
Capitalization fixed in https://invent.kde.org/multimedia/kdenlive/-/commit/91e56380ba2ed2c6c7272a3e197a809ee117ac5f