On 6/22/06, Vesa Solonen <[EMAIL PROTECTED]> wrote:
On Wed, 21 Jun 2006, Timothy Miller wrote:
> On 6/21/06, Jussi Vainionpää <[EMAIL PROTECTED]> wrote:
>
>> So can the OGC framerate / vertical refresh be finetuned by software
>> without causing glitches in the output?
>
> The thing to do is watch an in-coming vertical sync signal and adjust
> when we start the next frame. We can't get the pixel timing exact,
> but we can compensate for drift in frame start time.
How about software phase locking the pixel clock to the external sync? I
think that's what Jussi meant. Then it's pixel exact and works just like
hw-dvb boxes.
Well, in any case, the output frame has to be at least slightly behind
the input frame. There's going to be capture and retransmit latency.
If we decided that it was okay to be a scanline behind on the output,
then we really wouldn't need to adjust more often than once per frame.
I have a suspicion that a whole frame of delay is acceptable.
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