[Gstreamer-openmax] how to test gst-omx plugins?

[haomiao y. <hao...@gm...>]

 hi,

I have use gst-launch to run gst omx-mp3dec succesfully,
but I can not run omx-mpeg4dec succesfully

gst-lauch-0.10 filesrc location=./1.mp4 ! qtdemux ! omx_mpeg4dec !
ffmpegcolorspace ! videoscale ! ximagesink

it report get_buffer() failed

do you have some test cases or test example(commad) for me to use gst-launch
to play an mp4 or h263 video file

Thank you!