asfdemux: skip a frame with an abnormal time stamp.

Submitted by Rajesh Singh

Link to original bug (#753907)

Description

Created attachment 309786
patch to resolve the issue

Although a demuxer succeeded to parse a frame, the frame can be defective.
So I added some codes for the asf demuxer to skip frames with an normal timestamp.
I regarded the timestamp is abnormal in case the timestamp is out of the segment duration.
Issue can be observed with the attached test stream and can be resolved with the attached patch.
Kindly share your views/concerns on this.

Patch 309786, "patch to resolve the issue":
skip_abnormal_ts.patch