Join twitch.tv's chunked FLVs into single files
I often use youtube-dl to download archived videos from twitch.tv. However, their system stores each stream as a series of half-hour .flv chunks. It's annoying to have to queue those individually, and while ffmpeg can join them into one file, the process is tedious to perform by hand and it doesn't work without preprocessing the files to fix some FLV metadata. This automates the process.
go get github.com/aaroncm/twitch-join
twitch-join [-o output.flv] input1.flv input2.flv ...
If an output filename is not specified, one will be inferred from the common characters in the names of the input files. Lacking those, it will simply be joined.flv.