This reverts commit f72c3cf71fde622067f41f31a53978ba4c94469d.

https://bugzilla.gnome.org/show_bug.cgi?id=707340

Avoids ending up with completely bogus scaled duration/pts when new
buffers have invalid DTS.

It might cause errors in sinks that are not seekable and
have reported this (like e.g. fdsink)

https://bugzilla.gnome.org/show_bug.cgi?id=696228

https://bugzilla.gnome.org/show_bug.cgi?id=696437

- Fix up out-of-order incoming DTS values.
- Fix duration of initial sample.

Remove old DTS guessing code.

https://bugzilla.gnome.org/show_bug.cgi?id=696358

https://bugzilla.gnome.org/show_bug.cgi?id=687520

Rename gst_collect_pads_add_pad_full() to gst_collect_pads_add_pad() and fix all
invocations.

... rather than a buffer, and the detailed info in the sample info
rather than caps.

https://bugzilla.gnome.org/show_bug.cgi?id=671534

https://bugzilla.gnome.org/show_bug.cgi?id=671534

If downstream didn't answer our SEEKING query and told us
it's seekable, default to streaming=true. We couldn't do
this in 0.10 for backwards compatibility reasons, but we
can in 0.11. Play it safe.

Ignore the "streamable" property setting and create streamable
output if downstream is known not to be seekable (as queried
via a SEEKABLE query).

Fixes pipelines like qtmux ! appsink possibly creating seemingly
corrupted output if streamable has not been set to true.

Still needs to handle the channel positions/masks and
channel reordering.

... since default collection heuristics suffice.