Re: [Alsa-user] ice1712 recording
On Thu, 8 Dec 2016 12:18:47 -0600, James Shatto wrote:
>As well as a few CLI options for the same. Sox is good for that.
For SpaceFM I wrote a script to split and/or merge stereo wav. Written
on the fly, so most likely not good shell script writing, but it does
what it should do and IIRC ffmpeg was easier to use.
[rocketmouse@archlinux bin]$ ls -Ggl s2*
lrwxrwxrwx 13 Apr 27 2016 s2a -> s2m
lrwxrwxrwx 13 Apr 27 2016 s2d -> s2m
lrwxrwxrwx 13 Apr 27 2016 s2l -> s2m
-rwxr-xr-x 1 1791 Apr 28 2016 s2m
lrwxrwxrwx 13 Apr 27 2016 s2r -> s2m
[rocketmouse@archlinux bin]$ cat s2m
#!/bin/dash
version="2016-04-28"
usage()
{
cat< mono.wav:
s2m input_file.wav
stereo.wav > left.wav:
s2l input_file.wav
stereo.wav > right.wav:
s2r input_file.wav
stereo.wav > dual {left,right}.wav:
s2d input_file.wav
stereo.wav > all {mono,left,right}.wav:
s2a input_file.wav
EOF
exit $1
}
outfile()
{
outfile="$(echo "$infile" | sed 's/\(.*\).wav/\1_'$1.$suffix/I)"
if [ -f "$outfile" ]; then
echo "$outfile already exists"
usage 1
fi
}
ex2file()
{
outfile $1
echo "Export to $outfile"
case $1 in
mono)
ffmpeg -i "$infile" -ac 1 "$outfile"
;;
left)
ffmpeg -i "$infile" -map_channel 0.0.0 "$outfile"
;;
right)
ffmpeg -i "$infile" -map_channel 0.0.1 "$outfile"
;;
esac
}
case $1 in
-h|--help)
usage 0
;;
esac
infile="$1"
if [ ! -f "$infile" ]; then
echo "No file $infile"
usage 1
fi
num_ch=$(exiftool "$infile" | grep -v "File Name" | grep -v "Directory" | grep
"Num Channels" | cut -d: -f2 | sed s/\ //)
plural=""
if [ "$num_ch" = "" ]; then
num_ch="No"
else
if [ "$num_ch" -ge "2" ]; then
plural="s"
fi
fi
if [ "$num_ch" != "2" ]; then
echo "$num_ch channel$plural, not a stereo file"
usage 1
fi
suffix=$(echo "$infile" | rev | cut -d. -f1 | rev)
if [ "$(echo "$suffix" | tr [:upper:] [:lower:])" != "wav" ]; then
echo "Suffix is \"$suffix\", must be \"wav\", case sensitivity is not
required"
usage 1
fi
case $(basename $0) in
s2m)
ex2file mono
;;
s2l)
ex2file left
;;
s2r)
ex2file right
;;
s2d)
outfile right
ex2file left
ex2file right
;;
s2a)
outfile left
outfile right
ex2file mono
ex2file left
ex2file right
;;
esac
exit
--
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Re: [Alsa-user] ice1712 recording
> You can mix all 4 inputs down into one stream and then record that, but do you really mean that you can record to 4 separate application threads concurrently without mixing? No, I mean you can record all four channels as input at the same time with the same app. Hence the -c 4 aka 4 channels. In audacity you just select 4 channels and press record. Once recorded you can break them out into 4 mono channels and save each individually (unmixed). There's no mixing involved until you configure it to do so. WAV files and other audio formats often contain multiple tracks. Individual unmixed tracks. They are mixed at the time of playback if configured to do so. By default sound is often configured for stereo with one track panned left and one track panned right. But it's two tracks, not mixed (until reproduced and analog-illy mixed in air). Baring cheap sound devices that have bleed over between tracks with unintentional mixing. In audacity you can separate the channels and unpan them for two true mono tracks. As well as a few CLI options for the same. Sox is good for that. With unix-isms you can send your output to stdout and pipe to stdin of another app. Like tee which can then save a file and redirect the same output to another file. I've sometimes gone this route to output the raw WAV and a compressed MP3 at the same time to two different storage devices / locations. I seem to recall an arecord option to output each channel as it's own mono file. Which you could tail -f on other terminals to pipe that to other things. Seems like --separate-channels is that option. $ arecord --help - James -- Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today.http://sdm.link/xeonphi ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Multi and Format
Ed Stark wrote: > I cannot seem to get the linear to work after a multi, even if after a multi > -> rate -> linear -> slave. The "plug" plugin combines all needed automatic conversions; replace "rate->linear" with "plug". > Anything that I do that specifies a format after the multi ... is a secret. Regards, Clemens -- Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today.http://sdm.link/xeonphi ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
