On Sat, Feb 22, 2003 at 08:39:57PM +0100, Jonas Jermann wrote:
Hi
On Sat, Feb 22, 2003 at 04:23:55PM -0500, D Richard Felker III wrote:
BTW, you should try with vqscale=2 on the first pass and see if that works well, rather than vqscale=5. The latter will encode the whole first pass at very low quality so it probably won't estimate complexity well.
What about the encoding speed? Someone told me that it is the same for each quantizer (I doubt it). And what about quant=1? I
Encoding speed should not be affected by quantizer directly. Of course, the quantizer will affect motion estimation some, so it may change a little, but shouldn't change too much.
heard it shouldn't be used. Does this apply to 1. pass too?
It's probably safe to use q=1, but there's not much benefit and it can actually waste bits and reduce the quality if you use vqmin=1 with rate control.
And do small differences off quantizers matter for the estimation anyway? It doesn't encode yet, so my common sense tells me it will almost be the same result.
Yes it does encode. The first pass encodes *and* collects statistics from the encode to use in better distributing bits/adjusting quantizer in the second pass. So it's beneficial for the stats to be good. Rich