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From 94f95e3 to 19fa4f3

When we are dropping frames because of QoS disable the DTS interpolation because
we won't be able to update the timestamps and end up setting the wrong
timestamps. Instead, simply use the timestamps from ffmpeg.

ffmpeg typefinders don't do bounds checking for small chunks of
data, so just skip them if we don't have a lot of data, to avoid
invalid memory access and/or crashes.

The sample file is so small, we may just as well add a little
unit test for the previously fixed bug.

Fixes bug #586894.

Fixes playback of ADPCM clip (#591809).

Fixes bug #591469.

These statements aren't critical per se... and just clutter debug logs.

...instead of creating standard caps with all pixfmts.

Fixes bug #591038.

Fixes bug #591163.

This now uses ffmpeg functionality to keep random metadata next to
the buffers and to get the correct offset for a frame, similar to how
timestamps are handled.

Fixes bug #578278.

This cleans up licensing and makes it possible to build with LGPL code
only again.

Apart from that an opencore-amr encoder/decoder exists now but this
is not enabled as we don't want to use external libraries through ffmpeg
and have our own plugins for this already.

PixFmt that are declared in AVCodec.pix_fmts are ones which are 'officially'
declared as being supported. We should therefore not have to create a
AVCodecContext and open an encoder to know if it's supported or not.
Also, doing it this way allows us to better pickup configuration overrides
we have in gstffmpegcodecmap for some codecs (like restrictions on width,
height, framerate like it's the case for dnxhd).

Fixes #575545

The wrapper does not give the decoder the extradata correctly.
Just use theoradec.

Fixes bug #590172

Takes codec frame delay into account (roughly the same way it does for timestamps for reordered frames) to produce frames with correct offsets.
A special hack to allow trailing frame with timestamp=segment.stop to be displayed.

Fixes bug #578278.

So we get a message on the bus *and* tag events pushed downstream.

Cache any events we get from upstream before we're open, especially
tag events we may be getting from apedemux/id3demux or the like, and
push them downstream later when we've added our pads instead of just
dropping them silently. Fixes transcoding tags for Monkey's Audio
Files with preceding APE or ID3v2 tags (#586957). Add minimal unit
test for this.

Also push stream tags later after the global tags and the newsegment
event rather than right after creating the pad.

From fedaaee to 94f95e3

From 5845b63 to fedaaee

So we don't build stuff we don't use, with the added benefit that
the GStreamer registry won't complain about not being able to
load these 'plugins' when running GStreamer uninstalled.

We don't know if gst_element_register() will replace the known type
or reject it, so we really need to free the caps before.

Check for more automake command variants. Use printf instead of 'echo -n'
for portability

After a DISCONT, mark the next frame with DISCONT but don't wait for a new
keyframe. This greatly improves performance on lossy networks or currupted
frames as the decoder can usually continue and conceil errors up to the next
keyframe.

From f810030 to 5845b63

Fixes #585257