When I open a file that gtv can't open, it will usually either just not open it or crash, but on some files it will lock up the Xserver. Sometimes I can still switch away from VT7 and kill gtv. There's no category for smpeg, but it's closely related to SDL, so I've set that as the category.
Please attach a sample.
See lab.mov from http://www.zeldman.com/jz_resume4.html (third paragraph, link says 2 MB QuickTime.) Trying to play this movie makes the Xserver unresponsive to mouse clicks, though you can still switch VTs and killall -9 gtv.
gtv don't suppport quicktime format. Please use xanim instead.
I was aware that gtv doesn't support quicktime. However, the fact that there are so many applications (gtv, dri, xmms, netscape, etc.) that can reproducibly hang the Xserver suggests that either all these apps are broken, or the XFree 4.x code isn't stable. In any case, there are better ways to deal with unsupported file formats. :)