obs-qsv11: Fix CBR Spike

[thyintel]

Description

CBR improvement for new Intel platform, the peak bitrate is now down to 120% on average from 200% while keeping same bitrate and quality.

This PR will not build until VPL update (predicted by end of this month).

Motivation and Context

This change has been made to decrease the CBR spike on new Intel platforms.

How Has This Been Tested?

new Intel platforms on various driver versions

Types of changes

• Performance enhancement (non-breaking change which improves efficiency)

Checklist:

• [ x] My code has been run through clang-format.
• [ x] I have read the contributing document.
• [ x] My code is not on the master branch.
• [ x] The code has been tested.
• [ x] All commit messages are properly formatted and commits squashed where appropriate.
• [ x] I have included updates to all appropriate documentation.

[RytoEX]

This PR will not build until VPL update (predicted by end of this month).

Even when the new update is available, this code will probably need ifdef'd on the libvpl version, because obs-qsv11 is available on Linux where we do not control the version of libvpl available. On Ubuntu 22.04, which we still support, the version of libvpl available is 2022.1.0 (API 2.6). On Ubuntu 24.04, the version of libvpl available is 2023.3.0 (API 2.9).

[thyintel]

This PR will not build until VPL update (predicted by end of this month).

Even when the new update is available, this code will probably need ifdef'd on the libvpl version, because obs-qsv11 is available on Linux where we do not control the version of libvpl available. On Ubuntu 22.04, which we still support, the version of libvpl available is 2022.1.0 (API 2.6). On Ubuntu 24.04, the version of libvpl available is 2023.3.0 (API 2.9).

Sounds good. I will add the ifdef when the new version of libvpl is released.