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>what the BD acronym in “BD rate” stands for,

Bjontegaard Delta-Rate (BD Rate) metric, proposed in 2001 by Gisle Bjontegaard, is a method for calculating the average difference between two rate-distortion (RD) curves.

It is extremely common in codec comparison, along with terms like PSNR, SSIM and VMAF ( which is newer and developed by Netflix so it tends to get explained a bit more )

>’m certainly curious if this is aimed at becoming the new default format for Apple devices.

I certainly hope not. Not unless it is deterministic and much much higher quality.

by qarl1 hours ago|

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> I certainly hope not. Not unless it is deterministic and much much higher quality.

You're not comparing fairly. The author is intentionally using low-res images to illustrate how the compression works. You should compare these to, say, a JPEG compression at the same resolution and same bitrate. I think you'll find that this technique is quite an improvement to the compressions you already know and love.

by mrob1 hours ago|

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JPEG has the great advantage that all JPEG artifacts look like JPEG artifacts. Newer codecs create artifacts that can be mistaken for part of the original image. That's a heavy price to pay for improved compression efficiency.

by kllrnohj3 hours ago|

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> Why is the NN-only portion almost as fast on an iPhone 17 compared to a V100 when the V100 has 4x the FP throughput?

Might have some sequential section or a block size that struggles to fill a V100 or a large chunk of CPU-only work or any number of things like that.