The default of 2500 kbps was chosen 10 years ago and times have changed.
Logs and forums posts show that many users of OBS for recording don't
change their bitrate and end up with a 2.5 mbps recording which looks
terrible.
Now that service bitrate enforcement exists, this will be automatically
capped to the maximum bitrate for streaming services, so the only time
this should result in a problem is if the user's upload speed is the
limiting factor, hopefully rarer these days with increasing internet
speeds.
In updated versions of FFmpeg (5.1.x) and SVT-AV1 (1.2.0/1.3.0), the
rate contol mode selection mechanism has changed, causing CBR to throw
an "Invalid Parameter" error and the encoder will fail to start. This
appears to be caused by us specifying rc_max_rate, which will also fail
on FFmpeg CLI. Adjust how we manage rate control methods, appropriately
version-gated, to work with both our current dependency versions and the
versions that we'd like to use.
Rec. 2020 is really an SDR spec, but I think HDR10 made it okay to slap
PQ on it, call it an HDR spec. Rec. 2100 came along after and formally
allowed the use of PQ/HLG, so we should use 2100 instead.
For SVT-AV1, rate control is explicitly set via an "rc" option, so set
those options manually for SVT-AV1. CBR doesn't seem to be fully
supported, but it's sort of supported via CVBR (constrained variable
bitrate), which seems to be specific to each GOP size, which is about as
close to CBR as we can get.
Richard Stanway
Ryan Foster
derrod
Lain
PatTheMav
Jim
Chris
jpark37
Vainock
tytan652
Clayton Groeneveld