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Zoe Liu authored
The change is purely an encoder-side tuning, which constrains a GF group interval to be either 8, or 12, or a number larger than 12 (maximum of 16). The change is under ext_refs. This work has been part of the summer internship effort by chendixi@. Further, this CL removes the experiment of flex_refs and merges it into ext_refs, as flex_refs has been completely focused on the encoder side optimization for ext_refs. On Google test sets, above (stillness + interval enforcement) achieve a coding gain in BDRate as follows, compared against the AV1 baseline with all tools enabled by default (excluding ext-tx, global-motion, and convolve-round for speed concern): lowres: avg_psnr -0.193%; ovr_psnr -0.370%; ssim -0.332% midres: avg_psnr -0.556%; ovr_psnr -0.680%; ssim -0.798% Change-Id: Ia992d8ef0d82cc0ef2caba5eec9b26f0358e6bde
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