> What kind of video/properties did you test with? I used: 1- Two h264 (mp4) files queued. 2- EXR image sequence. No filter or editing action. Rendering preset: av1.webm. I did not change any parameters, leaving everything to default. @Andrew I don't understand how to use system libaom. I had stuck to using system ffmpeg by disabling the whole "thirdparty".