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spec - Quick-n-dirty spectrogram display for audio files
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| #!/bin/bash | |
| # spec - Copyright (c) 2024 Matthias C. Hormann | |
| # 2024-03-26 | |
| # Show spectrogram for an audio file, using ffmpeg's showspectrumpic | |
| # Add this to the "Open with…" context menu of your file manager! | |
| # define me | |
| me=`basename "$0"` | |
| version="0.2" | |
| if [ -z "$1" ] ; then | |
| exit 1; | |
| fi | |
| # Create temporary file names to use. | |
| # kludge for MacOS: Mac variant first, then Linux: | |
| TEMP=`mktemp -u -t ${me} 2>/dev/null || mktemp -u -t ${me}-XXXXXXXXXX` | |
| TEMPIMG="${TEMP}.png" | |
| TEMPTXT="${TEMP}.txt" | |
| # Shell + ffmpeg quoting rules are a mess, and inconsistent, | |
| # so better use a temporary text file for the info. | |
| # Save the original file name to show in the spectrogram. | |
| basename "$1" > "${TEMPTXT}" | |
| # Note: showspectrumpic height MUST be a power of 2! | |
| ffmpeg -v quiet -y -i "$1" -filter_complex showspectrumpic=s=1024x512:stop=22000,drawtext="expansion=none:textfile='${TEMPTXT}':x=(w-tw)/2:y=16:fontcolor='white':fontsize=20" "$TEMPIMG" | |
| exitcode=$? | |
| if [ $exitcode -ne 0 ] ; then | |
| rm "$TEMPTXT" | |
| exit $exitcode | |
| fi | |
| # Open in your default PNG image file viewer. | |
| # Using a subshell here so we can wait until closed, before removing the temp file | |
| # Macs don’t have `xdg-open`, so use `open` instead. Requires correct file extension. | |
| dummy=$(open "$TEMPIMG") | |
| rm "$TEMPIMG" "$TEMPTXT" |
I rewrote the quoting and filename part, so spec can now correctly display the craziest filenames and won’t break:
A spectrogram is normally used to diagnose audio properties and quality problems, but sometimes, just sometimes, you can find hidden treasures… ;-)
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spec
Quick-n-dirty spectrogram display for audio files, using ffmpeg.
I did this because I missed good old
spekso much… It’s been on a long hiatus and not available in Ubuntu & Linux Mint for a while, but it’ll come back (already in Debian Bookworm, I reckon).Copy this to a location in your path (
~/bin,~/.local/bin,/usr/local/bincome to mind),chmod +xit and you can quickly watch an audiofile’s spectrogram from the commandline:It will open in your default PNG file viewer:
You can also add this command as an Open With… context menu entry in your favourite file manager, for more ease of use.