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How to trim strings with bash

If you want to trim a string from or to a certain pattern, you don’t have to invoke cut, sed or awk. You can use the % operator to trim a string from the first or last occurrence of a pattern to the end or the # operator to trim from the beginning to the first or last occurrence of it.
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How to split and demux a file with FFmpeg

If you have a large video or audio file and want to split it into several smaller files, you can use ffmpeg to obtain that goal. What you need are the start timecodes and the length of the segments you want to cut. You can tell ffmpeg the start position of a segment with the -ss option and the length of a segment with the -t option. Read the rest of this entry