Vic wrote -
> Analogue artefacts are generally not very noticeable to the human eye
-
> but they usually end up being *very* expensive to encode digitally.
> Filtering the picture will often give a good increase in
compressibility
> without noticeable difference of the image.
...and VHS is extremely noisy. Especially as a source for a codec.
What are you using to digitise it?
IIRC VHS is approximately QVGA in resolution? 320x240? *And* it'll be
interlaced (which I have come to loathe utterly), so you'll probably
want to deinterlace to frames rather than fields prior to encoding. I
think VirtualDub does that?
At least if it is encoded as MPEG 2 it'll be in a format accepted by
most DVD players. If it's just resulting file size that is important,
I'd look at MPEG 4 (although Dirac is looking quite interesting).
Overall file size is dependant upon bitrate (constant or variable?!) -
and performance-wise, 4 beats 2. Generally. Movement will
automatically need higher bitrates - if you crank the rates down low
then yes, that little white blob against the green is going to get
averaged out!
Oh - do remember that commercial VHS will probably have Macrovision
protection on it that knackers the sync.
HTH a bit.
Peter
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