On 2/27/07, Albert Cahalan <[EMAIL PROTECTED]> wrote:
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.
The coding mode for I-frames is INTRA. INTER_NOMV (and other modes)
are for P-frames. The IDCT in Theora is specified exactly.
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