I have downloaded the latest version of Raspbian today, in the hope of being able to download and use GStreamer.

I need to use GStreamer to stream video across to another computer with minimal delay, currently I am achieving a delay of 2 seconds via VLC player. I need to have minimal if not any delay for the project (eyes for controlling a Lynxmotion Tri-Track robot running with a BotBoarduino).

Using this tutorial I have reached the step of adding deb http://vontaene.de/raspbian-updates/ . main to /etc/apt/sources.listand then sudo apt-get update however the following error occurs:

GPG error: http://vontaene.de. Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY

This error is preventing me from being able to install GStreamer.

2 Answers 2


Just to make sure that nobody looses two hours trying to fix this. You do not need to change anything in the sources.list anymore.

Install GStreamer with:

sudo apt-get install gstreamer1.0-tools

You need to install the debian-keyring. Then replace the key 1F41B907 in both placed below with the key that shows up after the "NO PUBLIC KEY" from the end of the update list. I'm still getting a package error but I think it is just an error in my /etc/apt/sources.list:

sudo apt-get install debian-keyring
gpg --keyserver pgp.mit.edu --recv-keys 1F41B907
gpg --armor --export 1F41B907 | sudo apt-key add -

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