The unit tests are riddled with g_assert() and friends, sometimes
containing functional code like set_state() calls in them even
(looking at you, pipeline/capsfilter-renegotiation). Make sure we
don't disable assert and cast checks for the unit tests even if
this has been specified for the rest of the code base, e.g. via
--disable-glib-asserts.

Because we can, and because it's the most interesting one
to control really, after xpos/ypos.

https://bugzilla.gnome.org/show_bug.cgi?id=638859

This was causing keyframe_granule to be set to 0 for all streams
when seeking to the beginning of the stream, i.e., at the
beginning of playback.  Fixes #619778.

Instead, use either 0 or 1, depending on bitstream version, which give
the correct result for streams which aren't cut off at start.
This allows that function to not return negative granpos.

https://bugzilla.gnome.org/show_bug.cgi?id=638276

Some cosmetic changes and expands on some bits of the documentation to
make it more newbie-friendly.

The outgoing buffer timestamp is calculated by scaling an output buffer
count by the src pad frame rate caps. If these caps change, we need to
reset the count and work from a new base timestamp. The new output
buffer timestamp is then the count scaled by the new caps values added
onto the base timestamp.

Avoids escaping strings for nothing and printing out useless buffer contents.

Makes more sense name-wise

Along with a bunch of other internal cleanups

API: gst_encoding_list_available_categories
API: gst_encoding_list_all_targets

API: gst_encoding_profile_find

Fixes #637735

API: gst_encoding_target_get_profile

reported by macosx gcc

There isn't really any good reason to get the last buffer from an
audio sink, so don't make the sink keep it around unnecessarily.

Moved from gst-plugins-bad into -base, becasue it uses videotestsrc
and other elements from -base, so it can't be in core.

Use autovideosink instead of hardcoded sinks. Use an additional colorspace
converter between videotestsrc and timeoverlay.

Original commit message from CVS:
* gst/selector/gstoutputselector.c:
* tests/icles/output-selector-test.c:
Use BOILERPLATE macro and update test to the latest api changes.

Original commit message from CVS:
* gst/multifile/gstmultifilesink.c:
Add a fixme comment.
* gst/selector/gstoutputselector.c:
Fix same leak as in input-selector.
* tests/icles/output-selector-test.c:
Improve the test.