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List:       ms-wmtalk
Subject:    Re: Video Bit Rates, asf overhead???
From:       Scott Harrison <scotthar () MICROSOFT ! COM>
Date:       1997-03-27 22:50:25
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Hi Khaled, Chewey,  and other with similar requests and problems.

I want to point out a couple of things in this report.

Comparing AVI bitrates in BYTES and ASF bitrates in BITS are valid if
you remember to do the math.  Which seems to be the discrepancy here.


> ----------
> From:         Khaled Ahmed[SMTP:ahmed@MAIL.GULFNET.CO.JP]
> Sent:         Wednesday, March 26, 1997 4:10 AM
> To:   Netshow@LISTSERV.MSN.COM
> Subject:      Video Bit Rates, asf overhead???
>
> Hi all,
>
> I tried to stream the snowbard.avi file (which comes with Microsoft
> for
> window 1.1).
> The original file is 160x120x16bit   with 10 fps. The file is 7 sec.
> Long.
> Here are some information about the compression and encoding steps:
>
> File Type                           size (Kbytes)
> bitrate (k.bps)
> Uncompressed(*.avi)                   2729
> 390
> Compressed(*.avi)                     213
> 30
> *.asf                                  98
> 206     (2578 packetsize)
>
> I used Media studio from Ulead to compress the file. The video codec
> was
> Cinepak by Radius and the audio codec was Microsoft ADPCM (8.000 kHz,
> 4 Bit,
> Stereo). Then, I used vidtoasf to convert the compressed file into
> *.asf
>
> Now can anybody kindly explain how and why the compressed file bitrate
> was
> changed from 30 to 206 kbps?
> I am also wondering why the file size decreased when it became *.asf.
> By the
> way, what is packetsize ?
>
> I have the compressed avi file if anyone wants to try and check.
>
> Any comment or help will be highly appreciated. Thank you in advance.
>
> Khaled Ahmed
> System manager
> GulfNet Communications Co. Ltd.
> Tokyo - Japan
> http://www.gulfnet.co.jp
>
>
>
> At 02:27 PM 3/25/97 -0800, scott- wrote:
> >The answer I got on this last point is the content. I would like to
> try
> >this my self can you supply me the raw avi file?
> >
> >scott-
> >
>

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