Revert "mpeg2dec: use _scale_ceil to compute frame period"
Revert "mpeg2dec: use _scale_ceil to compute frame period"

This reverts commit 73997498b61f61e6061f36445f973bad93e3ae17.

knuesel/gst-plugins-ugly,knuesel/gst-plugins-ugly,knuesel/gst-plugins-ugly