fate: Use the correct, local path to samples for opus reference files

This fixes running fate in configs where the samples are located
in a different path on the target.

Signed-off-by: Martin Storsjö <martin@martin.st>
avformat: add av_stream_get_parser() to access avformat AVParser

The AVStream.parser field is considered private and its location cannot be
preserved while preserving also ABI compatibility to libav, as libav added fields
before it.
Some tools like ffmpeg.c access this field though

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
ffmpeg: Use av_stream_get_parser() to avoid ABI issues

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'f9900822fc5f0b0c7242ca318290c090bd5d0af0'

* commit 'f9900822fc5f0b0c7242ca318290c090bd5d0af0':
  fate: Use the correct, local path to samples for opus reference files

Conflicts:
	tests/fate/opus.mak

See: ad7de82218e9ee2232e53ab49cda85767cf800e5
Merged-by: Michael Niedermayer <michaelni@gmx.at>
hevc: cleaning up, remove unused constants(cherry picked from commit 7eed32d076c57aa03011d65a64903e8bdb633978)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
hevc/cabac: add new context for new syntax elements related to Rext(cherry picked from commit 6d71e2394f52679cfc8b86fb5880f89e6bd311d4)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Adding Maintainer for dvbsubdec

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
RELEASE_NOTES: Mention Libav and add codename

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>