I tried SMTune .. It couldn't play videos and reported the error as: It wasn't possible to find the url for this video.http://www.smtube.org/
I installed it via the MX software installer
Did you try Minitube 2.4? It doesn't have the phonon4qt5 dependency and it works with the latest YouTube iteration -- at least it does for me.EDIT:
FWIW, I activated the experimental repository and installed Minitube 2.5 from a downloaded .deb file. The gdebi package installer brought in a ton of new packages (including phonon4qt5) and updated a few others. Afterward, Minitube 2.5 would launch and show YouTube videos in the menu list, but it would not play any of them. Also, a popup appeared in the KDE panel stating that NVidia was broken and the system was reverting to something else. Not good.
I removed Minitube 2.5 and re-installed Minitube 2.4. Same result: Minitube would not play YouTube videos, although I could still play them in web browsers and other multimedia players such as Kaffeine and VLC still played video files. It seemed that Minitube was FUBAR because of the upgrades that gdebi brought in, and there was no way to fix it. So I had no other choice besides restoring /root from a backup partition image.
Recommendation: Stick with Minitube 2.4 with Wheezy. I'm waiting until MX-15 comes out before attempting another Minitube 2.5 install.