advanced video compression - part 1.mht

mpeg test inter b. Dequantizer Algorithm hardware realization method and comparison c. Dequantize

            pre-processing (discussed later in this guide) on your video =
source,=20
            and you don't have the disk space/hard drive throughput to =
edit in a=20
            lossless codec like Huffyuv or Lagarith, this is the way to=20
            go.<BR><BR></P></TD></TR>
        <TR>
          <TD vAlign=3Dtop><B>3)</B></TD>
          <TD>
            <P><B>Huffyuv</B> - Lossless Video Compression, for a =
price.</P>
            <P><B>Origins:</B> A guy named Ben Rudiak-Gould wrote this =
wonderful=20
            little codec which is a lossless compression codec for both =
YUV and=20
            RGB video data.</P>
            <P><B>How it Works:</B> Huffyuv is a lossless codec. The =
name stands=20
            for Huffman-compressed YUV. Huffman was a guy who came up =
with=20
            something called "Huffman entropy encoding" which is =
basically what=20
            all lossless compression is originally based off of (Huffman =
coding=20
            is used in things like ZIP, RAR, etc). So you could say that =

            basically Huffyuv simply ZIPs every frame for its =
compression.</P>
            <P><B>Benefits:</B> Obviously, the biggest benefit is that =
you have=20
            a perfect recreation of the original video data (unless you =
do <A=20
            =
href=3D"http://www.animemusicvideos.org/guides/avtechbeta/colorspace.html=
">colorspace</A>=20
            conversions). That means no matter how many times you =
recompress the=20
            video in Huffyuv, you'll still have the same video data that =
you had=20
            in the beginning. This is a very nice thing. Huffyuv also =
compresses=20
            and decompresses video pretty quickly.</P>
            <P><B>Disadvantages:</B> Due to the very large space =
requirements=20
            (Huffyuv takes a LOT of disk space, sometimes 4x more than =
even DV),=20
            disk throughput becomes a very large factor. Playback at =
full=20
            resolution and full framerate is a daunting task for even =
the=20
            fastest computers. Also, this codec does not support the =
YV12=20
            colorspace (although modifications of the codec which DO =
support=20
            this colorspace exist).</P>
            <P><B>Recommendations:</B> If you have the disk space to =
burn, this=20
            is a very viable codec for editing. Huffyuv is also a great =
choice=20
            for exporting your final video out of your editing program, =
before=20
            you compress it with something else. <BR><BR></P></TD></TR>
        <TR>
          <TD vAlign=3Dtop><B>4)</B></TD>
          <TD>
            <P><B>Lagarith</B> - Better, Slower, Lossless Video =
Compression.</P>
            <P><B>Origins:</B> In 2004, SirLagsALot released the first =
version=20
            of this great codec which was designed to offer greater =
compression=20
            than Huffyuv.</P>
            <P><B>How it Works:</B> From the official Lagarith web site: =
<BR>
            <BLOCKQUOTE>Lagarith is able to outperform Huffyuv due to =
the fact=20
              that it uses a much better compression method. Pixel =
values are=20
              first predicted using median prediction (the same method =
used when=20
              "Predict Median" is selected in Huffyuv). This results in =
a much=20
              more compressible data stream. In Huffyuv, this byte =
stream would=20
              then be compress using Huffman compression. In Lagarith, =
the byte=20
              stream may be subjected to a modified Run Length Encoding =
if it=20
              will result in better compression. The resulting byte =
stream from=20
              that is then compressed using Arithmetic compression, =
which,=20
              unlike Huffman compression, can use fractional bits to =
encode a=20
              symbol. This allows the compressed size to be very close =
to the=20
              entropy of the data, and is why Lagarith can compress =
simple=20
              frames much better than Huffyuv, and avoid expanding high =
static=20
              video.</BLOCKQUOTE>
            <P><B>Benefits:</B> Like Huffyuv, Lagarith is a lossless =
codec, so=20
            you get back exactly what goes into it. In addition to =
offering=20
            better compression than Huffyuv (so it doesn't use as much =
disk=20
            space), it also has support for additional colorspaces such =
as YV12,=20
            and it offers interesting features such as a "reduced =
resolution"=20
            mode, which is useful for "bait-and-switch" editing =
(discussed later=20
            in this guide). Lagarith is also multithreaded, so that =
means if you=20
            have a CPU that can take advantage of this, you will get =
even faster=20
            performance. Finally, since it can make smaller files than =
Huffyuv,=20
            disk throughput is not as much of a factor, and your hard =
disk is=20
            less likely to become a bottleneck when trying to play back =
these=20
            files.</P>
            <P><B>Disadvantages:</B> Both compression and decompression =
can be=20
            slower than HuffYUV. If you have a slower CPU (under 2ghz or =
so),=20
            you may want to consider other options. This codec IS =
multitheaded=20
            though, whereas HuffYUV is not, so on newer dual core =
processors,=20
            this codec may compress and decompress even faster than =
HuffYUV.</P>
            <P><B>Recommendations:</B> As long as you have a fairly fast =
CPU, I=20
            would recommend that this be your codec of choice. </P>
            <P class=3Dbyline align=3Dright>ErMaC, AbsoluteDestiny and =
Zarxrax -=20
            February 2006</P></TD></TR></TBODY></TABLE>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"75%" =
align=3Dcenter border=3D0>
        <TBODY>
        <TR>
          <TD vAlign=3Dtop noWrap>
            <DIV align=3Dcenter><A=20
            =
href=3D"http://www.animemusicvideos.org/guides/avtechbeta/video4_2.htm">N=
ext:=20
            Page 2 - Distribution Codecs and =
Containers</A></DIV></TD></TR>
        <TR>
          <TD vAlign=3Dtop noWrap>
            <DIV align=3Dcenter><A=20
            =
href=3D"http://www.animemusicvideos.org/guides/avtechbeta/index.html"><FO=
NT=20
            =
size=3D+1>Index</FONT></A></DIV></TD></TR></TBODY></TABLE></TD></TR></TBO=
DY></TABLE></DIV></BODY></HTML>

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