Log Message:
Updated gst123 to 0.3.4.

Overview of changes in gst123-0.3.4:

* Option parsing bug for "-@, --list" fixed.
* Avoid annoying redundant tag updates.
* Support video subtitles [Ahmed El-Mahmoudy].
* Use A/a keys to set video opacity [Ahmed El-Mahmoudy].
* Work around kwin window manager policy "focus stealing prevention".
* Fix image filetype detection bug.
* Fix Issue 14: Use sync bus handler to set window xid.
* Fix Issue 13: In some cases playing videos leads to g_criticals().
* Added "-f, --fullscreen" option to start playback in fullscreen mode.
* Added "--volume" option to set initial playback volume.
* Ignore symlinks when crawling directories.
* Various bugfixes.