Assorted Linux Scripts, Tools, Tips and Utilities [Linux-Sound]

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===== Assorted Linux Scripts, Tools, Tips and Utilities =====

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==== wav file to specimen bank (sampler format) script ====

  * see here: [[/wiki/scripts_wav2specimen| wav2specimen ]]

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==== lscp2rgd - linuxsampler to rosegarden instrument ====

  * see: [[/wiki/script_lscp2rgd]]

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==== midi to hydrogen ====

  * [[/wiki/script_midi2hydrogen| convert drums of a midi file to hydrogen format ]]

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==== aj-snapshot - Store ALSA and JACK connections state ====

[[http://aj-snapshot.sourceforge.net/]]

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==== Download songs of an *.m3u File (mp3 collection) ====

Make a directory and then do this:

<code>
wget -O - http://djcj.org/audio/lam/lam-tracks-2010/lam10.m3u | while read i; do wget -c "$i"; done
</code>

(by Ken Restivo - 16. Mai 2011 22:06 - @lau-ml)

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==== make a *.wav swing (?) ====

[[http://all-day-breakfast.com/m/swing.sh]]

[[http://musicmachinery.com/2010/05/21/the-swinger/| Comparable (?) examples]]

(by Chris Cannam - 2. Juni 2010 16:41  - @lau-ml )

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==== jackctl - jack control python script ====

[[http://www.akjmusic.com/software/]]

[[http://www.akjmusic.com/software/jackctl20110317.py]]

(by Aaron Krister Johnson,  28. Mai 2010 18:16  - @lau-ml)

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==== a python script for making seamless loops in samples by cross fading ====

It uses sox and ecasound for processing and should work with wav, aiff and flac (maybe more).

planned (?): libsndfile support.

[[http://atte.dk/files/xfade_loop]]

(by Atte André Jensen, 11. Juni 2010 11:02 - @ lau-ml )

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==== convert a Hydrogen drumkit into a SF2 soundfont ====

[[http://code.google.com/p/hydro2sf2/]]

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==== conversion examples with mplayer / mencoder ====

=== wav to mp3 ===

<code>
for F in *.aac; do
  mplayer -ao pcm:file=$F.wav $F
  lame -h $F.wav $F.mp3;
done
</code>

(by Julien Claassen , 25. Dezember 2010 02:37 - @ lau-ml )

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<code>

  #!/bin/bash
  # flac_to_mp3
  for f in *.mp3; do lame -v "$f"; done
</code>

(James Morris,22. September 2010 11:20)


<code>
$ find . -name "*flac" -exec lame -V0 {} \;
</code>

(Roger, 22. September 2010 12:52)

=== Using MEncoder to create DVD-compliant files ===

[[http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-vcd-dvd.html]]

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=== convert DV files to DVD compliant ===

[[http://florin.myip.org/soft/conv-dvd/]]

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=== convert sound files with libsndfile ===

sndfile-convert

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==== conversion examples with sox ====

convert a .wav file to raw PCM - here 8bit (''-b 8'') signed integer (''-e signed''), stereo (''-c 2''):
  sox INFILE.wav -t raw -r 48k -e signed -b  8 -c 2 OUTFILE.raw

convert raw CD digital audio (16-bit, signed-integer) to floating point wav:
  sox input.cdda -e float output1.wav

generate (''-n'' = NULL input) a .wav file with a 3 second sine-sweep:
  sox -n OUTFILE.wav synth 3 sine 300-3300 gain -5

The format-options must be given before the filename for which they're intended. If unspecified they are read from the file header (if possible):

Synopsis:
  sox [global-options] [format-options] infile1 \ 
      [[format-options] infile2] ... \
      [format-options] outfile \
      [effect [effect-options]] ...
      
Common encoding-types for ''-e'': signed, unsigned, float. see ''man sox'' for a complete reference.

==== conversion examples with ecasound ====

FIXME

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==== move regions, markers, temi in an Ardour session ====

A script to slide every regions, markers, tempi, meters, automations, and so on in an Ardour session.

"Actually, it's not really a solution, as one can move only ALL REGIONS,..."

by Aurélien

[[http://lists.linuxaudio.org/pipermail/linux-audio-user/2011-June/079213.html| announce mail]]

[[http://lists.linuxaudio.org/pipermail/linux-audio-user/attachments/20110617/50c10587/attachment.obj| Download (tar.gz ?)]]

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==== spaces to underscores ====

<code bash>
#! /bin/bash
#
# spaces2underscores.sh

echo
echo "This command changes all spaces in file names into underscores"
echo "  for ALL FILES IN THIS DIRECTORY !"
echo "  Type ENTER to continue or ^C to quit"

read dummy

for f in *; do
 oldname=`echo $f |sed 's/ /~/g'`
 newname=`echo $f |sed 's/ /_/g'`
 if [ $oldname != $newname ]
 then
   echo mv $f $newname
   mv "$f" $newname
 fi
done
</code>

(Marc Groenewegen, 25. September 2010 08:49 )

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==== Extract Audio from Video and recombine ====
(help by Robin Gareus @lau-ml)

=== with ffmpeg ===

<code>

#extract audio
ffmpeg -i orig_video.wmv audio_out.wav

#replace audio
ffmpeg \
 -i orig_video.wmv \
 -i new_audio.wav \
 -vcodec copy \
 -map 0.0 -map 1.0 \
 new_video.wmv

</code>


<code>
Details:  The "map" may be different depending on the .wmv file.
run `ffprobe` to see which is the video-track in the .wmv file
usually this is "0.0".
   Stream #0.0: Video:...
   Stream #0.1: Audio: ..
and "1.0" corresponds to the 2nd input file - your new audio.

You may want to add "-acodec wmav2" and "-ar 128k" options for 128kbit/s
Windows Media Audio 2 or whatever audio-codec/quality your want. `ffmpeg
-codecs | grep "EA"` gives you a list of available codecs for Encoding
Audio.

</code>


BTW. Ardour3 with videotimeline patch can do all this for you.
import,extract,re-encode using ffmpeg.



>> Thanks. It is 0:0 and 0:1 and -b:a=192k I found, but I have some sync problems after recombining tho. Any other ideas?

My gut feeling is to blame ffmpeg's WMV muxer (it may not be able to mux
a bit-exact copy of the original video with your new soundtrack).

<code>

Try using '-sameq' instead of '-vcodec copy' (re-encode the video with
same quality rather than a bit-exact copy - this often solves muxing
issues but will cause a small loss of either video quality or increased
bandwidth).

</code>

and also try a different output format eg. 'new_video.avi' or '..mov'
instead of 'new_video.wmv'.

<code>

you may need both, this should work:
 'ffmpeg -i vid.wmv -i aud.wav -sameq -map 0.0 -map 1.0 output.avi'

</code>

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=== with mencoder ===

[[http://savvyadmin.com/extract-audio-from-video-files-to-wav-using-mplayer/]]

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=== posssibly other options ===

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  * kdenlive
  * ardour3 + video patch

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==== Tips ====


=== use a proper python shell ===

(by Torben Hohn, 28. September 2010 01:16 )

ipython is there for quite some time.

and i recently discovered bpython

[[http://ipython.scipy.org/moin/]]

[[http://bpython-interpreter.org/]]

this is where the fun starts

also help() works nicely on instances.

doctests also pretty much kick ass.

[[http://docs.python.org/library/doctest.html]]