silan: Soundfile silence analyzer

OPTIONS

-h, --help: display this help and exit
-b, --bounds: skip silence mid file. print start/end boundaries only.
-B, --fastbounds: same as -b, except the sound-off is detected by decoding backwards from the end. This is much faster but also inacurate.
-f, --format <format>: specify output format (default: 'txt')
-F, --filter <float>: high-pass filter coefficient (default:0.98) disable: 1.0; range 0 < val <= 1.0
-o, --output <filename>: write data to file instead of stdout
-p, --progress: show progress info on stderr
-q, --quiet: inhibit error messages
-s, --threshold <float>: RMS signal threshold (default 0.001 ^= -60dB) postfix with 'd' to specify decibels
-t, --holdoff <float>: holdoff time in seconds (default 0.5)
-u, --unit <unit>: specify output unit (default: 'seconds')
-v, --verbose: increase debug-level (can be used multiple times)
-V, --version: print version information and exit

This application reads a single audio file and analyzes it for silent periods. Timestamps/ranges of silence are printed to standard output.

Valid output formats are: txt, JSON, audacity (label file)

Valid output units are: samples, seconds (audacity format uses seconds regardless).

Sound is detected if the signal level exceeds a given threshold for a duration of at least <holdoff> time. Note that the returned timestamps are corrected for the holdoff-time.

The fast boundary scan can decrease the time it takes to analyze a file at the cost of accuracy. Use --fastbounds with care. Due to low-pass filtering and RMS calculation the results will be different (+- .1 sec), furthermore some codecs are not suitable for backwards decoding or sample-accurate seeking and may skew the timestamp by one second or more. The fast boundary scan mode requires a seekable file and does not work with streams.

silan (1)

SYNOPSIS

DESCRIPTION

OPTIONS

REPORTING BUGS

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