In your case it was some other process that was using the port and as indicated in the comments, sudo netstat -pna | grep 3000 helped you in solving the problem. While in other cases (I myself encountered it many times) it mostly is the same container running at some other instance. In that case … Read more
Libav is dead Last commit was on 2019-08-21. Use FFmpeg. Confusing messages The messages mentioned in the question are rather misleading and understandably a source of confusion. The fork was basically a non-amicable result of conflicting personalities and development styles within the FFmpeg community. The real ffmpeg vs the fake one For a while both … Read more
You have */30 in the minutes specifier – that means every minute but with a step of 30 (in other words, every half hour). Since cron does not go down to sub-minute resolutions, you will need to find another way. One possibility, though it’s a bit of a kludge(a), is to have two jobs, one … Read more