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vangel76andClaude Sonnet 5.5
c82633c8d7
Bitrate mode coded the first frame four times with a fixed gain. Now the first pass still gets the old correction (30 quantizer steps per halving of the size, which fits the starting range), and from the second correction on the next quantizer is placed in the log domain of the quantizer step, where the frame size is close to a line: false position between the nearest passes that enclose the target, otherwise a secant step with the measured slope. The search stops as soon as the size is within 3 % of the target, when no untried quantizer is left between the enclosing passes, or when it would repeat a quantizer (a target the content cannot reach, where the old code coded the same frame at the lowest quantizer up to four times). At most four passes remain. The first frame is within 3 % of the target on the same cells as before and nearer to it on most of the others; two cells where the size jumps by a factor of 4 or more between neighbouring quantizers (noisy content) land further away than with the old search. Total passes over the 28 test cells: 112 -> 70. Part of #2390 Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>