Properly initialize psz_name in PrintObject(). Fixes a warning: "Conditional jump or move depends on uninitialised values"

When demuxing with ffmpeg, set the VLC block I frame flag when it is marked as such by lavf. This fixes flv restreaming without transcoding.

Simple Preferences - Audio: Don't build widget not useful for your platform instead of hiding them. Will remove some weirdness on windows for resizing.

If you wan a better decription of each module in this file please add it.

The problem came from my misreading of the API
This commit also fix potential misunderstanding by simplifying it further

2.3.4 is the unstable branch, as not indicated on the download page
This reverts commit cbac72de.

Fix compilation with external opencdk

Avoid an infinite loop for this case too (only 3 tries to connect, then abort)