[Ffmpeg-devel] Trellis Quantization Applied To (A)DPCM
Sun Jun 4 02:08:31 CEST 2006
On Sat, 3 Jun 2006, Mike Melanson wrote:
> I see that Loren took Michael's suggestion seriously and applied
> Trellis quantization to the ADPCM encoder. This reminds me of discussions on
> MPlayer-devel about optimizing ADPCM decoding with SIMD instructions. :)
> So, can this be applied to, e.g., Creative YUV? I had wanted to write
> an encoder for that at one point but I sort of got stuck wondering about an
> optimal (quality-wise) method for creating the delta tables.
Trellis can tell you the optimal sequence of deltas in each line, but
can't determine the optimal table to choose them from.
The obvious heuristic would be: count up how many times each delta appears
in the frame, then run K-Means.
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