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List:       ms-wmtalk
Subject:    Re: Content Converstion
From:       "Steven Levi (ICCD)" <levi () MICROSOFT ! COM>
Date:       1997-03-28 20:33:07
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Why did u not mention MPEG4 as a low bit rate video?


        -----Original Message-----
        From:   Scott Harrison
        Sent:   Friday, March 28, 1997 9:56 AM
        To:     Netshow@LISTSERV.MSN.COM
        Subject:        Content Converstion

        > More Details from our content experts.
        >
        > One thing is the conversion of data rate.  The .avi has a data
rate of
        > kilobytes!, not kilobits.  Therefore the 30 KB is about
240kb/s,
        > close to what is expected and found...213 kbs.  It seems the
file size
        > and bitrate
        > are getting confused.  But the data rate (bitrate) apparent
change
        > from
        > 30 to 213 is correct, because of the byte / bit issue.
        >
        > One reason that the .asf gets smaller is that .avi often
aligns things
        > with a CD-rom sized block, and often has quite a bit of empty
space in
        > the .avi. So, despite
        > our .asf overhead, we still have a smaller file.
        >
        > The audio codec is not the optimal one for low rate video.
ADPCM will
        > inflate the size and bitrate.  You should try either
Truespeech, MSN
        > Audio, or FHG.  As it's music, the L&H 4.8 probably won't
sound good.
        >
        > For video the VDO codec is good for low bitrate video and the
Intel
        > indeo codec is good on the INTRANET for higher bitrates.
        >
        > I would recommend checking out the Content Creation Authoring
Guide
        > for
        > more details.
        >
        > http://www.microsoft.com/netshow/howto.htm
        >
        > thanks
        > scott-
        >

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