Quick follow up: additional constraint to trigger the bug is that the preview cursor in the timeline is placed somewhere on the clip so that a preview is generated in the Project Monitor window. It does not happen if I close the Project Monitor window, but then, rendering the project crashes with the same message in the error log:
[filt @ 0x7fa8708b87a0] Invalid and/or missing input/output value. [filt @ 0x7fa8708b87a0] Failed to configure output pad on filt [filter avfilter.compand] Cannot configure the filter graph It also happens with only a single clip in the project, so I tried converting the audio to mp3 (without MKV container), which also crashed when applying the filter/moving the cursor. I also experienced similar crashes with some other effects in the past. I didn't investigate further back then, but those crashes could be related. Cheers, - Roland
