[MOVED FROM BAD] replace framerate aproximations by their real value (24000/1001, 30000/1001, 60000/1001)

Original commit message from CVS:
* ext/dv/gstdvdec.c:
* ext/libfame/gstlibfame.c:
* gst/subparse/gstsubparse.c: (parse_mdvdsub):
* gst/y4m/gsty4mencode.c: (gst_y4mencode_sinkconnect):
replace framerate aproximations by their real value
(24000/1001, 30000/1001, 60000/1001)
Finish fixing bug #164049