missing of H.264 Decoder on Ubuntu 12.04

Asked by paul

When i try to convert Video mp4 files to mp3 i receve the massage:
Python (v2.7) need extension files of type H.264 decoder.

on addition i receve the error:

failed to install plugins: <enum GST_INSTALL_PLUGINS_NOT_FOUND of type GstInstallPluginsRetrun>

is something wrong, or whow can i install the H.264 decoder?

regards
Paul

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Launchpad Janitor (janitor) said :
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