no puedo quemar dvd con brasero

Hola tengo en realidad dos preguntas la primera es que no puedo grabar con brasero un dvd de video por que me resulta el siguiente error :

Instale manualmente lo siguiente e inténtelo de nuevo: mplex (complemento de GStreamer).

agradeceria si me pueden colaborar y de no poderse que otro programa libre lo reemplazaria. gracias.

y la segunda es que en los correos que me han llegado (ultimo seis o siete) solo llega el siguiente mensaje por cada punto del dia, en otras ocasiones llega otro repitinedose mensaje tras mensaje.

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Date: Tue, 20 Sep 2011 05:46:09 +0200 (CEST)
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Subject: Re: [Trisquel-usuarios] Firefox y vídeos de youtube
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