Reusing/relabeling media with bacula

A few weeks ago I reinstalled my backup server with bacula. I have a small machine (2x700MHz, 1GB, Solaris 10, Bacula 5.0.3) with 3 DDS-3 tape drives (and other stuff to play around). Now I want to reuse my old tapes which were already labeled. So I have to do some kind of relabeling. When I try to normally label the prior used tapes I get the following error: 

Creating mp4 for Android with ffmpeg

I am traveling to work by public transportation and I thought it would be a cool idea to have some movies with me during the train ride. Of course I have to encode them first. Here is a way to do this with ffmpeg: