New avconv instead of ffmpeg

[Peter Gueckel]

Richard Shaw wrote:

> RPM Fusion generally follows the Fedora guidelines, which include
> when and when not to update, so 1.0.X to 1.1.X would generally be
> discouraged within a release.

I asked on their mailing list during roughly fedora 16, about a 
year or more ago, and this is what they told me.

Unfortunately, they didn't upgrade during the transition to fedora 
17, nor to fedora 18 either.