gst/flv/gstflvparse.c: Use gst_pad_alloc_buffer_and_set_caps() to make sure we get...

gst/flv/gstflvparse.c: Use gst_pad_alloc_buffer_and_set_caps() to make sure we get a buffer with caps that we can wor...

Original commit message from CVS:
* gst/flv/gstflvparse.c: (gst_flv_parse_tag_audio),
(gst_flv_parse_tag_video):
Use gst_pad_alloc_buffer_and_set_caps() to make sure we get
a buffer with caps that we can work with (i.e. the pad's caps).
Add non-keyframe video frames to the index too but without the
keyframe flag.
Add audio frames to the index only if we have no video stream.