Well, I tricked y4mscaler into doing what I want, but the results were
a bit discouraging. To get a horizontal lowpass spatial filter with
cutoff N/D<1 I just did a downsample by N/D followed by an upsample by
N/D (using the sinc8lan kernel). What I found was that (to my eye)
there was no visibl
For me, scalers are only an occasional diversion from my daily grind
For what it's worth, a 'blur factor' option is on my list of things to
add to y4mscaler; I imagine it would simply scale the size of the kernel
to lower the spatial cut-off frequency.
Right
> You hit the nail on the head on this one. I build scalers
> (and hence pre and reconstruction filters) for my job. Quite
> apart from my normal struggle just to halfways find time to
> properly develop mpeg2enc this means that I can't easily do
> this for the proj
--reduce-hf doesn't actually throw away the higher frequency DCT bins.
What it does is simply increase their quantisation (which of course means
more low-amplitude ones get 0-ed).
Is it easy to make the amount of the increase and the transition
adjustable? To give yet ano
Hi Andrew -
> quantisation matrix for each DCT that you can specify in each picture
> coding sequence. However, a well-known trick is to selectively 0
> isolated bins (they have a high coding overhead) you think won't reduced SNR
Is this the "single coefficient elimination" that is use
Hi Dan,
> I think extent of the ringing artifacts depend on the source images
> being encoded. If the spatial bandwidth of the signal hitting
> mpeg2enc has already been limited (by camera optics, preprocessing,
> etc) then at higher spatial frequencies the spectrum will already roll
> off, and w
I think extent of the ringing artifacts depend on the source images
being encoded. If the spatial bandwidth of the signal hitting
mpeg2enc has already been limited (by camera optics, preprocessing,
etc) then at higher spatial frequencies the spectrum will already roll
off, and will probably be le
