Commands tagged alsa (13)
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This will allow you to convert an audio file to wav format, and send it via ssh to a player on the other computer, which will open and play it there. Of course, substitute your information for the sound file and remote address You do not have to use paplay on the remote end, as it is a PulseAudio thing. If the remote end uses ALSA, you should use aplay instead. If it uses OSS, you should berate them about having a lousy sound system. Also, you're not limited to transmitting encoded as wav either, it's just that AFAIK, most systems don't come with mp3 codecs, but will play wav files fine. If you know SoX is installed on the remote end and has mp3 codecs, you can use the following instead:
cat Klaxon.mp3 |ssh thelab@company.com play -t mp3 -this will transmit as mp3. Again, use your specific information. if you're not playing mp3s, use another type with the -t option7sox Klaxon.mp3 -t wav - |ssh thelab@company.com paplay -
outputs a f=220Hz guitar string sound (fifth string A) needs ALSA
7f=220;echo "int s=16e3/$f;main(i){unsigned char v[s];read(0,v,s);for(;;)putchar(v[i%s]=(v[i%s]+v[++i%s])/2);}"|gcc -x c -&&./a.out</dev/urandom|aplay -d 2 -
This one doesn't need to convert to wav.
6ssh [user]@[address] "mpg321 -" < [file].mp3 -
Record from a webcam, audio using ALSA encoded as MP3, video as MPEG-4.
5ffmpeg -f alsa -r 16000 -i hw:2,0 -f video4linux2 -s 800x600 -i /dev/video0 -r 30 -f avi -vcodec mpeg4 -vtag xvid -sameq -acodec libmp3lame -ab 96k output.avi -
Yet another x11grab using ffmpeg. I also added mic input to the capturing video stream using alsa. Yet I need to find out how to capture audio which is currently playing. Show Sample Output
5ffmpeg -f alsa -itsoffset 00:00:02.000 -ac 2 -i hw:0,0 -f x11grab -s $(xwininfo -root | grep 'geometry' | awk '{print $2;}') -r 10 -i :0.0 -sameq -f mp4 -s wvga -y intro.mp4 -
Record audio to an MP3 file via ALSA. Adjust -i argument according to arecord -l output.
4ffmpeg -f alsa -ac 2 -i hw:1,0 -acodec libmp3lame -ab 96k output.mp3 -
for when a program is hogging the sound output. finds, and kills. add -9 to the end for wedged processes. add in 'grep ^program' after lsof to filter. Show Sample Output
2lsof /dev/snd/pcm*p /dev/dsp | awk ' { print $2 }' | xargs kill -
Stream OGG vorbis over ssh.
2ssh [user]@[host] "ogg123 -" < [podcast].ogg -
Records audio from your mic in FLAC (Free Lossless Audio Codec) format, starts only after it detects at least 0.1 seconds of noise and stops after 1 second of silence. You can adjust the percent values (sensitivity) to best fit your microphone and voice (0.1% if you have a great quality mic, higher if you don't, 0% does not trim anything). Useful for speech recognition in conjunction with my previous command titled 'Google voice recognition "API"' (http://www.commandlinefu.com/commands/view/8043/google-voice-recognition-api).
1sox -t alsa default ./recording.flac silence 1 0.1 5% 1 1.0 5% -
Or,
aumix -v -5Map these to key combinations in your window manager and who needs special buttons?0aumix -v +5 -
Now we can capture only a specific window (we have to chose by clicking on it) ffmpeg complains about "Frame size must be a multiple of 2" so we calculate the upper even number with (g)awk trickery. We remove the grep, we are already using (g)awk here ....why losing time with grep !!! ;) Show Sample Output
0a=$(xwininfo |gawk 'BEGIN {FS="[x+ \t]*"} /-geometry/ {print int(($3+1)/2)*2"x"int(($4+1)/2)*2"+"$5"+"$6}') ; echo ${a} ; ffmpeg -f x11grab -s ${a} -r 10 -i :0.0 -sameq -f mp4 -s wvga -y /tmp/out.mpg -
Replace "Master" with desired control name (e.g. Front, Earphone, PCM, etc.). Show Sample Output
0amixer -c 0 set Master 100% -
adjusts the 'Master' channel's volume up by 1dB. Can use command 'amixer' to see other channels : Simple mixer control 'Master',0 or Simple mixer control 'Capture',0 Show Sample Output
0amixer -c 0 set Master 1dB+
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