/usr/share/farstream/0.2/fsrtpconference/default-codec-preferences is in libfarstream-0.2-5 0.2.8-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Audio codecs #
################
# We love Opus !
# But please give us standardised payloading
[audio/OPUS]
[audio/X-GST-OPUS-DRAFT-SPITTKA-00]
[audio/SPEEX:8000]
clock-rate=8000
[audio/SPEEX:16000]
clock-rate=16000
[audio/AMR]
[audio/G729]
[audio/ILBC]
# It seems to be pretty common to hard-code that dynamic payload type 101
# is telephone-event at clock rate 8000. This also avoids an interop
# bug with Google Chrome's WebRTC, GMail and possibly other implementations.
[audio/telephone-event:8000]
clock-rate=8000
id=101
# Disabled audio codecs
# These are unsuitable for calling
[audio/DV]
id=-1
[audio/MPA]
id=-1
[audio/VORBIS]
id=-1
[audio/MP3]
id=-1
################
# Video codecs #
################
[video/H264]
#feedback:tfrc=
feedback:nack/pli=
# We like VP8, but H.264 is still better
[video/VP8-DRAFT-IETF-01]
[video/H263]
feedback:nack/pli=
[video/THEORA]
#feedback:tfrc=
feedback:nack/pli=
[video/JPEG]
# Disable the ones we don't want
[video/DV]
id=-1
[video/MPV]
id=-1
# Payloader is broken, see gnome bug #577784
[video/H263-2000]
id=-1
#[rtp-hdrext:video:0]
#id=3
#uri=urn:ietf:params:rtp-hdrext:rtt-sendts
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