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OpenDivX digest, Vol 1 #31 - 2 msgs



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Today's Topics:

   1. Alternative to uncompressed AVI --> VOB frames directly packed into AVI (Thierry Brunet)
   2. Encode Speed on Various Platforms (Lloyd Ferguson)

--__--__--

Message: 1
From: "Thierry Brunet" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>
Date: Tue, 6 Mar 2001 18:54:49 -0000
Subject: [OpenDivX] Alternative to uncompressed AVI --> VOB frames directly packed into AVI

This is a multi-part message in MIME format.

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I am having a hard time creating uncompress AVIs from VOB files in order to
benchmark various codecs as this process creates huge files.

Is there a way to generate an AVI file that directly re-use or repack the
same compressed frames as stored in the VOB file? That is without performing
a decompression and re-compression? This way, there would be no loss of info
and size would be same as VOB thus considerably smaller than uncompressed
AVI.

Where can I find detailed information on how a VOB file is structured (I am
not expert enough to dig into Flask’s source code)

I am new to the DivX universe; my apologies if this issue has already been
covered previously.

Regards,

Thierry Brunet de Courssou
London, UK.





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<div class=3DSection1>

<p class=3DMsoNormal><span class=3DEmailStyle17><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>I am having a hard time creating uncompress AVIs from VOB files =
in order
to benchmark various codecs as this process creates huge files. =
</span></font></span><span
class=3DEmailStyle17><font size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;
mso-bidi-font-size:12.0pt;mso-ascii-font-family:"Times New =
Roman";mso-hansi-font-family:
"Times New Roman";mso-bidi-font-family:"Times New Roman";color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></span></p>

<p class=3DMsoNormal><span class=3DEmailStyle17><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>&nbsp;</span></font></span><span class=3DEmailStyle17><font =
size=3D2
color=3Dblack><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;mso-ascii-font-family=
:
"Times New Roman";mso-hansi-font-family:"Times New =
Roman";mso-bidi-font-family:
"Times New =
Roman";color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></s=
pan></p>

<p class=3DMsoNormal><span class=3DEmailStyle17><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>Is there a way to generate an AVI file that directly re-use or =
repack the
same compressed frames as stored in the VOB file? That is without =
performing a
decompression and re-compression? This way, there would be no loss of =
info and
size would be same as VOB thus considerably smaller than uncompressed =
AVI.</span></font></span><span
class=3DEmailStyle17><font size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;
mso-bidi-font-size:12.0pt;mso-ascii-font-family:"Times New =
Roman";mso-hansi-font-family:
"Times New Roman";mso-bidi-font-family:"Times New Roman";color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></span></p>

<p class=3DMsoNormal><span class=3DEmailStyle17><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>&nbsp;</span></font></span><span class=3DEmailStyle17><font =
size=3D2
color=3Dblack><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;mso-ascii-font-family=
:
"Times New Roman";mso-hansi-font-family:"Times New =
Roman";mso-bidi-font-family:
"Times New =
Roman";color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></s=
pan></p>

<p class=3DMsoNormal><span class=3DEmailStyle17><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>Where can I find detailed information on how a VOB file is =
structured (I
am not expert enough to dig into Flask&#8217;s source =
code)</span></font></span><span
class=3DEmailStyle17><font size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;
mso-bidi-font-size:12.0pt;mso-ascii-font-family:"Times New =
Roman";mso-hansi-font-family:
"Times New Roman";mso-bidi-font-family:"Times New Roman";color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></span></p>

<p class=3DMsoNormal><span class=3DEmailStyle17><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>&nbsp;</span></font></span><span class=3DEmailStyle17><font =
size=3D2
color=3Dblack><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;mso-ascii-font-family=
:
"Times New Roman";mso-hansi-font-family:"Times New =
Roman";mso-bidi-font-family:
"Times New =
Roman";color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></s=
pan></p>

<p class=3DMsoNormal><span class=3DEmailStyle17><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>I am new to the DivX universe; my apologies if this issue has =
already
been covered previously.</span></font></span><span =
class=3DEmailStyle17><font
size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New =
Roman";
mso-bidi-font-family:"Times New =
Roman";color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></s=
pan></p>

<p class=3DMsoNormal><span class=3DEmailStyle17><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'>&nbsp;</span></font></span><span class=3DEmailStyle17><font =
size=3D2
color=3Dblack><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;mso-ascii-font-family=
:
"Times New Roman";mso-hansi-font-family:"Times New =
Roman";mso-bidi-font-family:
"Times New =
Roman";color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></s=
pan></p>

<p class=3DMsoNormal><span class=3DEmailStyle17><font size=3D2 =
color=3Dblack
face=3DArial><span lang=3DFR =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;
font-family:Arial;mso-ansi-language:FR'>Regards,</span></font></span><spa=
n
class=3DEmailStyle17><font size=3D2 color=3Dblack><span lang=3DFR =
style=3D'font-size:
10.0pt;mso-bidi-font-size:12.0pt;mso-ascii-font-family:"Times New =
Roman";
mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:"Times New =
Roman";
color:black;mso-color-alt:windowtext;mso-ansi-language:FR'><o:p></o:p></s=
pan></font></span></p>

<p class=3DMsoNormal><span class=3DEmailStyle17><font size=3D2 =
color=3Dblack
face=3DArial><span lang=3DFR =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;
font-family:Arial;mso-ansi-language:FR'>&nbsp;</span></font></span><span
class=3DEmailStyle17><font size=3D2 color=3Dblack><span lang=3DFR =
style=3D'font-size:
10.0pt;mso-bidi-font-size:12.0pt;mso-ascii-font-family:"Times New =
Roman";
mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:"Times New =
Roman";
color:black;mso-color-alt:windowtext;mso-ansi-language:FR'><o:p></o:p></s=
pan></font></span></p>

<p class=3DMsoNormal><span class=3DEmailStyle17><font size=3D2 =
color=3Dblack
face=3DArial><span lang=3DFR =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;
font-family:Arial;mso-ansi-language:FR'>Thierry Brunet de =
Courssou</span></font></span><span
class=3DEmailStyle17><font size=3D2 color=3Dblack><span lang=3DFR =
style=3D'font-size:
10.0pt;mso-bidi-font-size:12.0pt;mso-ascii-font-family:"Times New =
Roman";
mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:"Times New =
Roman";
color:black;mso-color-alt:windowtext;mso-ansi-language:FR'><o:p></o:p></s=
pan></font></span></p>

<p class=3DMsoNormal><span class=3DEmailStyle17><font size=3D2 =
color=3Dblack
face=3DArial><span lang=3DFR =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;
font-family:Arial;mso-ansi-language:FR'>London, =
UK.</span></font></span><span
class=3DEmailStyle17><font size=3D2 color=3Dblack><span lang=3DFR =
style=3D'font-size:
10.0pt;mso-bidi-font-size:12.0pt;mso-ascii-font-family:"Times New =
Roman";
mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:"Times New =
Roman";
color:black;mso-color-alt:windowtext;mso-ansi-language:FR'><o:p></o:p></s=
pan></font></span></p>

<p class=3DMsoNormal><span class=3DEmailStyle17><font size=3D2 =
color=3Dblack
face=3DArial><span lang=3DFR =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;
font-family:Arial;mso-ansi-language:FR'>&nbsp;</span></font></span><span
class=3DEmailStyle17><font size=3D2 color=3Dblack><span lang=3DFR =
style=3D'font-size:
10.0pt;mso-bidi-font-size:12.0pt;mso-ascii-font-family:"Times New =
Roman";
mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:"Times New =
Roman";
color:black;mso-color-alt:windowtext;mso-ansi-language:FR'><o:p></o:p></s=
pan></font></span></p>

<p class=3DMsoNormal><span class=3DEmailStyle17><font size=3D2 =
color=3Dblack
face=3DArial><span lang=3DFR =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;
font-family:Arial;mso-ansi-language:FR'>&nbsp;</span></font></span><span
class=3DEmailStyle17><font size=3D2 color=3Dblack><span lang=3DFR =
style=3D'font-size:
10.0pt;mso-bidi-font-size:12.0pt;mso-ascii-font-family:"Times New =
Roman";
mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:"Times New =
Roman";
color:black;mso-color-alt:windowtext;mso-ansi-language:FR'><o:p></o:p></s=
pan></font></span></p>

<p class=3DMsoNormal><span class=3DEmailStyle17><font size=3D2 =
color=3Dblack
face=3DArial><span lang=3DFR =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;
font-family:Arial;mso-ansi-language:FR'>&nbsp;</span></font></span><span
class=3DEmailStyle17><font size=3D2 color=3Dblack><span lang=3DFR =
style=3D'font-size:
10.0pt;mso-bidi-font-size:12.0pt;mso-ascii-font-family:"Times New =
Roman";
mso-hansi-font-family:"Times New Roman";mso-bidi-font-family:"Times New =
Roman";
color:black;mso-color-alt:windowtext;mso-ansi-language:FR'><o:p></o:p></s=
pan></font></span></p>

<p class=3DMsoNormal><span class=3DEmailStyle16><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial'><![if =
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></font></span></p>

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--__--__--

Message: 2
Date: Tue, 06 Mar 2001 10:47:30 -0800
To: [email protected]
From: Lloyd Ferguson <[email protected]>
Subject: [OpenDivX] Encode Speed on Various Platforms

I'm new to this list so please excuse me if this has been addressed before.

I have seen several references to it taking in the order of 20 hours to
encode a DVD movie to CD length.  I'm assuming that much of the experience
in this field is from people using their typical home/office PC for
experimentation.  If someone wanted to use DivX in a semi-commercial
application are there hardware platforms that can encode faster?  

For example, I understand that the Mac G4/Power PC vastly outperforms dual
Intel processors in some multimedia related applications and SGI boxes have
been mainstays of the graphics industry for many years.  I also know from
experience that for general purpose applications, Linux far outperforms
Windows on Intel architecture.

Does anyone know of any benchmarks for DivX encoding on various platforms?

Where are the bottlenecks?

If I wanted to build/buy the ultimate DivX encode machine(s) what would
they be?

Lloyd Ferguson
[email protected]



--__--__--

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