Linux, Darkice, Alsa, plughw and sample rates

[ki4lqu]

I'm currently having some trouble getting darkice to play nicely with this sound card.

I've figured out that this sound card will only open capture at 48000. If I stream at 48000 it sounds great, but the specs for Radioreference call for 22050kHz.

Streaming at 22050 is impossible using hw:1,0 for the device. Using plughw:1,0 works, but the sample rate is apparently configured to convert from 44100. This makes the audio choppy and the voice sound slightly lower pitched and distorted. ( Knoxville Police Dispatch ) I need to configure (Alsa) to convert from 48000 instead when using "plughw"

I have very little experience using either or Darkice or Alsa, and since Darkice cannot do any sample rate conversions, I am now tackling the issue of properly configuring "plughw" The Alsa documention is very limited and quite confusing when it comes to this simple matter. I was hoping someone here could point to the configuration options to do this.

I could get another card that will do 22050 directly, but I was hoping someone could offer a configuration fix.

TIA!
ki4lqu

 

[jansenonline]

Same problem

Hi,

I currently have the same problem. When encoding at 44100 the feed sounds perfect. But this is against the rules so I'd like to reduce to 22050 but as soon as I do the feed is lower in pitch and slowed down.

In darkice there are two sections: input and icecast2-0 both of which you can put samplerate, bitspersample and channel, etc. I don't know the correct combination or if it's just a problem with my usb sound device or something.

Have you figured it out?

Grtz,

Marnix