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MPEG Encoding Question

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Tim

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Jul 20, 2001, 10:41:53 PM7/20/01
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Are there any rules regarding the pixel dimensions required to encode an AVI
file into an MPEG file? I capture at 640x480 but I crop it to 640x464,
using Virtual Dub, to remove any noise from VHS sources.

When I encode the cropped AVI using LSX's MPEG encoder, it encodes without a
hitch. However, Panasonic's encoder will balk about certain input
dimensions. Is there a specific rule about dimensions that are considered
standard?

Also, even though LSX is much less fussy about the input dimensions, is
there any possibility that certain playback software won't play the final
MPEG because of it? Thanks in advance.


David Godec

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Jul 21, 2001, 7:45:43 PM7/21/01
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> When I encode the cropped AVI using LSX's MPEG encoder, it encodes without
a
> hitch. However, Panasonic's encoder will balk about certain input
> dimensions. Is there a specific rule about dimensions that are considered
> standard?

Yes, if you are dealing with PAL or SECAM/MESECAM video the full frame size
is usually 720*576 ,sometimes 704*576, with NTSC the vertical resolution is
only 480, the horizontal being the same...However, i encourage you to use
Tsunami Mpeg encoder, which gives far better results in terms of video
quality than Lsx mpeg (the last version of lsx mpeg i tried don't even work
well with my P3 (saturation bug...)).


>
> Also, even though LSX is much less fussy about the input dimensions, is
> there any possibility that certain playback software won't play the final
> MPEG because of it? Thanks in advance.

Hardware players ( i.e. vcd/svcd or dvd players are usually not tolerant
about picture size, except for some (tokai/yamakawa,etc...)) I don't know of
Software players being limited in resolution except in that they usually
require horizontal size being multiple of 16...(720=45*16,704=44*16...)
If the purpose is only to play video on your PC it's a better idea to keep
it in AVI format,much more versatile( can compress video in Mpeg4 and sound
in Mp3....) i use VirtualDub 1.4c myself to do stuff like that and it's
faster than any standalone mpeg encoder i found...
--
David Godec
13,rue Voltaire
FR-62970 Courcelles-Les-Lens


Tim

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Jul 23, 2001, 1:00:39 AM7/23/01
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Many thanks.


"David Godec" <david...@online.fr> wrote in message
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LandSlide

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Aug 16, 2001, 1:53:05 AM8/16/01
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The Tsunami Mpeg encoder seems to work better than all the others i've
tried, thanks for mentioning that, i've been lookin' everywhere for a better
encoder :)

The only downfall is that it's like watching ice melt while encoding :)


"David Godec" <david...@online.fr> wrote in message
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