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mikk9 avatar mikk9 commented on July 22, 2024

Update:

  • enabling mbbrc enables extbrc, this function is swapped in QSVEnc 3.19
  • as a result mbbrc isn't working anymore for all modi which is a big downgrade for H265 because there is no LTR support
  • adapt-ltr works actually (CBR+VBR H264) when b-pyramid is disabled

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mikk9 avatar mikk9 commented on July 22, 2024

MBBRC is working again, however adapt-ltr isn't working anymore in QSVEnc 3.20. I believe adapt-ltr also required extbrc because adapt-ltr in QSVEnc 3.19 only worked in combination with extbrc and extbrc isn't working either anymore with the swap fix.

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mikk9 avatar mikk9 commented on July 22, 2024

This feature is available for the user defined BRC (ExtBRC) and will turn ON automatically when using the internal rate controller provided in the SDK (implicit) and when encoding parameter allow use of LTR. A new option mfxExtCodingOption3::ExtBrcAdaptiveLTR (on/off) is available in API 1.26 to control adaptive LTR.
https://software.intel.com/en-us/articles/improve-encoding-efficiency-and-video-quality-with-adaptive-ltr

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