How to debug
First check whether the problem is covered by the FAQ and troubleshooting section. If not:
- add
SHOWCONSOLEat the beginning of the command line, to see if the FFmpeg process starts and if any red error report appears, - add
-reportor-report -loglevel debugto the command line, this will generate the FFmpeg log file in the current folder.
Then check and fix the FFmpeg syntax, and try again.
Note: remember to remove the -report and -loglevel options afterwards, because they slow the filter down.