diff --git a/revid/config.go b/revid/config.go
index 59207107..63f6d017 100644
--- a/revid/config.go
+++ b/revid/config.go
@@ -76,10 +76,10 @@ type Config struct {
 	AutoWhiteBalance string
 
 	// Audio
-	SampleRate uint // Frame rate in Hz.
-	Period     int  // How many seconds to record at a time.
-	Channels   int  // Number of audio channels, 1 for mono, 2 for stereo.
-	BitDepth   int  // Sample bit depth, 16-bit by default.
+	SampleRate int // Samples a second (Hz).
+	Period     int // How many seconds to record at a time.
+	Channels   int // Number of audio channels, 1 for mono, 2 for stereo.
+	BitDepth   int // Sample bit depth.
 }
 
 // Possible modes for raspivid --exposure parameter.
diff --git a/revid/revid.go b/revid/revid.go
index 47c2c4f2..cda7f127 100644
--- a/revid/revid.go
+++ b/revid/revid.go
@@ -676,7 +676,7 @@ func (r *Revid) setupInputForFile() error {
 
 // startAudioInput is used to start capturing audio from an audio device and processing it.
 func (r *Revid) startAudioInput() error {
-	ai := NewAudioInput()
+	ai := NewAudioInput(&r.config)
 
 	go r.processFrom(ai, time.Second/time.Duration(r.config.Rate))
 	return nil