Command-line application to edit asciicast files (produced by Asciinema)
go install github.com/pckhoi/asciiedit
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asciiedit speedup FILE TIMES
: Speed-up one or more lines in the cast file. Example:asciiedit speedup original.cast 2 -r 30:81 -r 9:17 -r 99:116 > spedup.cast