Increase or decrease audio volume on cmdline

shevegen · 15th November 2007, 11:20

Anyone knows a cmdline way to inrease or decrease audio volume?
so that it gets louder or more silent

At best of course any audio format, but I would be fine if its .wav or .mp3

nm · 15th November 2007, 12:14

Do you mean adjusting playback volume in sound card mixer settings, or changing the audio volume of a music file permanently.

There are many command-line mixer tools. On Linux, take a look at amixer (ALSA tool) or aumix (ALSA and OSS).

For volume normalization, search for mp3gain, aacgain and vorbisgain.

To adjust volume of wav files, use Sox.

shevegen · 15th November 2007, 12:40

Hi,

Permant modifications

alsamixer etc.. turning volume up is trivial

Also no "normalization", just a set to a target i can specify.

I will play with sox, thanks.

nm · 15th November 2007, 14:23

Well, you can use mp3gain and aacgain to adjust gain by a specific amount. Using them makes sense if your input files are encoded and you want to keep the output in the same format. Otherwise you'll need to re-encode and quality will suffer.

shevegen · 15th November 2007, 19:21

Quote:

Otherwise you'll need to re-encode and quality will suffer.

Good point!
Do you by chance know by how much the quality will suffer?

nm · 15th November 2007, 22:11

That will depend on the quality of the input file. 48kbps AAC will probably suffer noticeably, good quality 128kbps MP3 not so much (you probably won't hear the difference). But as I said, in these cases you can adjust the volume without re-encoding and without losing quality.

15th November 2007, 11:20	#1 \| Link
shevegen Registered User Join Date: Nov 2003 Posts: 422	Increase or decrease audio volume on cmdline Anyone knows a cmdline way to inrease or decrease audio volume? so that it gets louder or more silent At best of course any audio format, but I would be fine if its .wav or .mp3 __________________ OS: Paldo (Linux) AviSynth for Linux, go go go!

15th November 2007, 12:40	#3 \| Link
shevegen Registered User Join Date: Nov 2003 Posts: 422	Hi, Permant modifications alsamixer etc.. turning volume up is trivial Also no "normalization", just a set to a target i can specify. I will play with sox, thanks. __________________ OS: Paldo (Linux) AviSynth for Linux, go go go!

15th November 2007, 12:14	#2 \| Link
nm Registered User Join Date: Mar 2005 Location: Finland Posts: 2,641	Do you mean adjusting playback volume in sound card mixer settings, or changing the audio volume of a music file permanently. There are many command-line mixer tools. On Linux, take a look at amixer (ALSA tool) or aumix (ALSA and OSS). For volume normalization, search for mp3gain, aacgain and vorbisgain. To adjust volume of wav files, use Sox.

15th November 2007, 14:23	#4 \| Link
nm Registered User Join Date: Mar 2005 Location: Finland Posts: 2,641	Well, you can use mp3gain and aacgain to adjust gain by a specific amount. Using them makes sense if your input files are encoded and you want to keep the output in the same format. Otherwise you'll need to re-encode and quality will suffer.

15th November 2007, 22:11	#6 \| Link
nm Registered User Join Date: Mar 2005 Location: Finland Posts: 2,641	That will depend on the quality of the input file. 48kbps AAC will probably suffer noticeably, good quality 128kbps MP3 not so much (you probably won't hear the difference). But as I said, in these cases you can adjust the volume without re-encoding and without losing quality.