NAME¶
silan - Soundfile Silence Analyzer
SYNOPSIS¶
silan [
OPTIONS ]
<file-name>
DESCRIPTION¶
silan - Audiofile 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.
REPORTING BUGS¶
Report bugs to Robin Gareus <robin@gareus.org>
Website and manual: <
https://github.com/x42/silan>
COPYRIGHT¶
Copyright © GPL 2012 Robin Gareus <robin@gareus.org>