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lavc/vaapi_encode_h265: add private b_strategy option for hevc_vaapi
Allow user to choose between I/P/B frames: - normal Ordinary IB..BPB..B GOP structure. - low delay B-frames: IB..B GOP structure, P frames replaced by B frames, allows forward-predict only for all B frames, L0 == L1, required by VDENC(low_power), optional for VMEPAK. - reference B-frames: Convert P-frames to low delay B-frames, normal B frames still have 2 different ref_lists and allow bi-prediction. Low delay B: <http://what-when-how.com/Tutorial/topic-397pct9eq3/High-Efficiency-Video-Coding-HEVC-288.html> There is an on-going work in libva and media-driver to add querys support for low delay b, would add it once it's ready: intel/libva#220 intel/libva#364 intel/media-driver#721 Rebased a bit for this internal branch. Signed-off-by: Linjie Fu <linjie.fu@intel.com>
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