Changes between Version 8 and Version 9 of Capture/ALSA

Timestamp:

Oct 12, 2020, 2:57:19 AM (6 years ago)

Author:

llogan

Comment:

use private options as shown in the docs

Capture/ALSA

@@ -125 +125 @@
 = Input options =
 
-The only useful [https://ffmpeg.org/ffmpeg.html#Audio-Options audio input options] for ALSA input are `-ar` (audio sample rate) and `-ac` (audio channels).
-
-Specifying audio sampling rate/frequency will force the audio card to record the audio at that specified rate. Usually the default value is "44100" (Hz).
-Specifying audio channels will force the audio card to record the audio as mono, stereo or even 2.1/5.1 (if supported by your audio card). Usually the default value is "1" (mono) for Mic input and "2" (stereo) for Line-In input.
+The only useful [https://ffmpeg.org/ffmpeg.html#Audio-Options audio input options] for ALSA input are `-sample_rate` (audio sample rate) and `-channels` (audio channels).
+
+* Specifying audio sampling rate/frequency will force the audio card to record the audio at that specified rate. Usually the default value is "44100" (Hz).
+* Specifying audio channels will force the audio card to record the audio as mono, stereo or even 2.1/5.1 (if supported by your audio card). Usually the default value is "1" (mono) for Mic input and "2" (stereo) for Line-In input.
 
 = Examples =
@@ -136 +136 @@
 When doing screencast recordings, you usually want to record your voice too:
 {{{
-ffmpeg -f alsa -ac 1 -ar 44100 -i hw:0 -t 30 out.wav
+ffmpeg -f alsa -channels 1 -sample_rate 44100 -i hw:0 -t 30 out.wav
 }}}
 Looking at our example device listing, this would be the same as this:
 {{{
-ffmpeg -f alsa -ac 1 -ar 44100 -i default:CARD=ICH5 -t 30 out.wav
+ffmpeg -f alsa -channels 1 -sample_rate 44100 -i default:CARD=ICH5 -t 30 out.wav
 }}}
 
@@ -155 +155 @@
 You can now record audio from a running application using:
 {{{
-ffmpeg -f alsa -ac 2 -ar 44100 -i hw:Loopback,1,0 out.wav
+ffmpeg -f alsa -channels 2 -sample_rate 44100 -i hw:Loopback,1,0 out.wav
 }}}
 
@@ -214 +214 @@
 You can now record audio from a running application using:
 {{{
-ffmpeg -f alsa -ac 2 -ar 44100 -i loopout out.wav
-}}}
+ffmpeg -f alsa -channels 2 -sample_rate 44100 -i loopout out.wav
+}}}