Conn O'Griofa 1b6bf8fa34 video: use a better vbv-bufsize & correct software bitrate calculation ...

* Increase vbv-bufsize to 1/10 of requested bitrate. The previous value
  was too low, which was resulting in poor encoding quality and failure to
  stabilize at the requested bitrate. Setting to 1/10 of bitrate is a
  good compromise, as it avoids quality loss but also prevents bandwidth
  spikes far above the bitrate/vbv-maxrate.
* With vbv-bufsize set to a more appropriate value, testing shows that
  the average bitrate vs client-requested bandwidth overshoots by ~20%.
  Adjust for this scenario in the software encoding case only.

2022-01-18 09:42:25 +01:00

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