A temporary fix on the RAM issue for upsampled referencing
When ext-refs is on, the encoding of HD videos, e.g. 1080p sequences will cause the failure to allocate up-sampled frame buffers. This CL temporarily turn off the use of upsampled references when ext-refs is on for any video resolution larger than 720 in either dimension. A more effective scheme for up-sampled referencing should be later considered. With the fix, the AWCY performance gains of ext-refs, vs baseline are: PSNR Y Average -2.55% 1080p -2.81% 360p -2.38% 720p -3.10% Change-Id: Ica5e75d82190cd68e64c536503e3559f1cfdbdd1
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