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It seems to me this code is useless: removing it.

https://bugzilla.gnome.org/show_bug.cgi?id=618871

when the SDP specifies an aggregate control url, use that for playback
control.

Fixes #619531

So matroska's Block structure has no keyframe flag, only the SimpleBlock has it.
To detect keyframes in Blocks, it is just the BlockGroup container that needs
to have a ReferenceBlock attached if it is a delta frame in video.

Fixes #583047 (more).

Use an adapter to collect incoming data, and use adapter API to scan and peek.

Fixes #583047.

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Fixes #620154.

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Fixes generic/states unit test.

Use new dts audio typefinder from -base to check if the PCM data
contains a dts stream. This way we recognise more varieties more
reliably and also detect the dts stream if there isn't a frame
sync right at the start of the data.

Fixes #413942.

gst_type_find_helper_for_buffer() will need the correct offset
set on the buffer (ie. 0) and not the byte offset we started
pulling the data from.

Fixes #589997.

... by using proper offsets for tag list writing.
Also use _reset rather than _free and consistently use bytewriter position.

See #619293.

Add the generated orc source files

All audio frames are marked as keyframe now instead of marking
them all as delta unit...

Only remaining MMX implementation is the ARGB/BGRA/AYUV blending
for which we first need the orc compositing opcodes.

The cycleCount register is 13 bits long and the cycleOffset one
is 12 bits long. To read the cycleCount register we need to shift
12 bits and not 13. Fixes #615461

Start cluster at every keyframe or when we would overflow the previous
cluster's relative timestamp field. This would avoid as much as possible
starting clusters at non-keyframes.

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