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Re: Lossless Compression



OK, the PC capture of whatever feed is lossless...
 
Like taking a file and using zip to compress it. The file when uncompressed is exactly the same as the source. Lossless
 
As opposed to using jpeg/mpeg/mjpeg which uses tricks to compress images down. When the image is uncompressed it is not identical to the source. Not lossless.
 
Look at matroxusers web site vcdhelper, any big video editors website for details as to why this is a good idea...
 
I don't only capture from tv, I capture from dv and my s-vhs deck.
 
Jason
 
 
----- Original Message -----
Sent: Tuesday, May 28, 2002 11:19 AM
Subject: [ukha_d] Lossless Compression

Jason,

This is really a question for you...

How are you achieving lossless compression with SS?

I was thinking about this last night and the only way I can see of doing
this is to take a feed into a SAT card in the PC direct from the LNB to
catch the digital stream before it is decoded thus achieving a lossless
compressed file. The problem with that is that there is no CAM available
for Sky Digital to enable this to be done with a SAT card or TV.

AFAIK the only way to do this, or more accurately, the only system that
can do this, is Sky+ as it actually records the stream directly and
plays back as it would be presented straight off the air.

If you are running it through the STB and then transferring that signal
to your SS machine then that is not lossless, you are in fact, doing
what any PVR or VHS machine would do.

K.


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