March 2017 – Survival recipes

cut audio files with ffmpeg

To create an mp3 file of the first 30s of an existent mp3 file, just use the following command.

ffmpeg -t 30 -i inputfile.mp3 -acodec copy outputfile.mp3

In case the original format is not mp3 you can use instead

ffmpeg -t 30 -i inputfile.webm -acodec libmp3lame -aq 4 outputfile.mp3

Move current reference of branch on Git

To force a git branch to point to a specific commit use the next command: git branch -f <branch-name> <commit-hash>