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How to debug

First check whether the problem is covered by the FAQ and troubleshooting section. If not:

  1. add SHOWCONSOLE at the beginning of the command line, to see if the FFmpeg process starts and if any red error report appears,
  2. add -report or -report -loglevel debug to 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.