Howdy -
On Mon, 5 Jan 2004, Matto Marjanovic wrote:
Thanks for chiming in!
> I believe that for downscaling, yuvscaler defaults to its "RESAMPLE" mode,
> which is similar to y4mscaler's "box" kernel. The other yuvscaler mode
Yes, that's what I thought - the usage summary from yuvscaler says
resample is what it uses by default for downscaling.
> No (and not really)... the current default is 'linear'; a better would be
> 'cubic', and even better is something like 'sinc:8'. I haven't had the
I'm using sinc:8 - a carryover from the previous option of
'sinc8lan' (I think that's what it was called in y4mscaler 0.5.x).
> You need to add "-I norm=NTSC" *before* the "-O preset=SVCD"; options are
> evaluated in order. (This is not clear in the manpage. I'll fix that.
> In fact, it might make more sense to evaluate all -I options before any
> -O options...)
Ah ha - that's the part I didn't realize. It's not clear which
programs process their args once in order and which ones make
multiple passes.
> The 'norm' is inferred from the frame rate (not the frame size). mplayer
Oh ok - I thought it might be keying on the frame size since 480, 240
are NTSC as a rule and 576 and 288 are PAL usually.
> has provided a lame approximation to "24000/1001", and y4mscaler is looking
Sigh yes, they still haven't managed to get that right and I'm
tired of fighting 'em to fix it. That's why I came up with
tools to strip off the header and allow me to recreate it correctly.
>
> After that, y4mscaler will probably complain that it doesn't know the
> sample aspect ratio (SAR) of the input --- and, really, it can't do much
And don't bring that topic up on mplayer or ffmpeg mailing lists
unless you are prepared for a flame fest (and then settling on
72:79 instead of 10:11)
> If this is just some bootleg movie warez, it's probably in pretty sad shape
> as it is, and no one will notice anyway; just say "-I sar=1:1".
The source as I recall was a .AVI file so it was likely created
as a quicktime movie, etc and thus 1:1 is the SAR and "-I sar=1:1"
is the correct thing to use.
Cheers,
Steven Schultz
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