Monthly Archives: July 2015

Configuring the Cisco SPA112 2-Port Phone Adapter for 3starsnet VoIP

The Cisco SPA112 is an Analogue Telephone Adapter, you can configure this device to enable internet telephony (VoIP) for up to two analogue telephones.


After plugging in the power, ethernet cable and analogue telephone, you can check the DHCP status of your internet (Wi-Fi) router for the IP-address of the SPA112. I actually used the Network Discovery Android app to discover the device on my home network.

Now we have found the IP-address, let’s configure this puppy… Continue reading Configuring the Cisco SPA112 2-Port Phone Adapter for 3starsnet VoIP

Extracting audio from a YouTube video using avconv

You can download YouTube videos with the NetVideoHunter Firefox add-on. After installing the add-on, you can download a YouTube video by clicking the icon.


By default the add-on downloads the best available quality from YouTube, that is very convenient.

The downloaded file has an mp4 extension.  Using the libav command line tool avconv, you can extract the audio without transcoding. This way the process is very fast and the audio quality remains the same:

avconv -i testvideo.mp4 -codec copy -vn testaudio.m4a

The -codec copy option makes sure the audio is extracted without conversion an the -vn option excludes the video being written to the output file.

To install avconv on Debian:

sudo apt-get install libav-tools