Thank you! Using process PID or time, all are fine by me, as long as I don't easily overwrite them. Best option, in my opinion, would be to combine PID/time with previous filename (to make searching for the right log easier). I'd personally disable logging of error/help messages, but that's not a bi...

Please change back the log filename. It's now "log.txt" everywhere. For Blu-ray discs, using -demux or -check created "00001 - Log.txt" for 00001.mpls, similar to chapter filename. Now it's log.txt, which I accidentally overwrote with another eac3to command. Even "eac3to -help" writes to log.txt now.