On 2/26/07, Chih-Chung Chang <[EMAIL PROTECTED]> wrote:
On 2/26/07, Albert Cahalan <[EMAIL PROTECTED]> wrote:
>
> (BTW, I can imagine a fine low-CPU codec. You can use
> 100% P-frames w/o motion vectors if the decompressor
> is carefully specified regarding rounding. Start the stream
> with an implied solid-color frame, probably grey. Cuts and
> joins can be done anywhere at the cost of one or two
> recompressed frames.)
I think this can be done by using the INTER_NOMV mode in Theora.
That sounds like I-frames, not P-frames. P-frames depend on
preceding frames. Normally you can't keep going with them
forever because round-off errors in the decoder will accumulate.
If the decoder is more standardized though, the encoder could
determine exactly what the decoder is using as a reference.
So INTER_NOMV won't work. Theora also has the space-filling
curve that was a neat but bad idea.
If being XO-specific is OK, one could even plan for video to be
played back without the swizzle. By using 12x12 blocks
(yes, you can do a transform on non-power-of-two -- see FFTW)
and a quantization table that makes special allowance for the
red/green/blue stripes, you could get color video while only
decoding a single channel of data.
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