https://bugs.freedesktop.org/show_bug.cgi?id=101787
--- Comment #17 from Julien Isorce julien.isorce@gmail.com --- (In reply to 247 from comment #16)
No such file "test.mp4"
Yes you need to point to a valid mp4 file.
Also try gst-launch-1.0 playbin uri=file:///home/you/test.mp4 -v