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      <div xmlns:adobe="http://www.adobe.com/saxon" class="contentmap"><a href="index.html?topicId=WS5b3ccc516d4fbf351e63e3d117cbc98bab-7ff7.html">CONTENTS</a></div>
      
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<ul xmlns:adobe="http://www.adobe.com/saxon" class="navigation"><li class="prev"><a accesskey="p" class="prev" href="WS5b3ccc516d4fbf351e63e3d117cbc98bab-7fcc.html" title="Grabbing still images"><img src="images/blank.gif" alt="Previous" width="17" height="17" /></a></li><li class="next"><a accesskey="n" class="next" href="WS5b3ccc516d4fbf351e63e3d117cbc98bab-7ff8.html" title="Recording DVCPro HD"><img src="images/blank.gif" alt="Next" width="17" height="17" /></a></li></ul><div xmlns:adobe="http://www.adobe.com/saxon" class="hierarchy" id="hierarchy"><a href="index.html">Using Adobe OnLocation CS5</a> : <a href="WS5b3ccc516d4fbf351e63e3d117cbc988bc-7ffa.html">Recording, reviewing, and transferring clips</a> /
     <a href="WS5b3ccc516d4fbf351e63e3d117cbc98bab-7ff0.html"><b>Recording clips</b></a> 
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        <h1>
          Recording HDV
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        <div xmlns:adobe="http://www.adobe.com/saxon" id="minitoc"><div class="t"><div class="b"><div><ul id="minitoc-links"><li><p><a href="#WS5b3ccc516d4fbf351e63e3d117cbc988bc-7ff9"><h1 class="topictitle1">Balancing video quality and system resources</h1>
</a></p></li><li><p><a href="#WS5b3ccc516d4fbf351e63e3d117cbc98bab-7fb0"><h1 class="topictitle1">Adjust MPEG decompression</h1>
</a></p></li><li><p><a href="#WS5b3ccc516d4fbf351e63e3d117cbc988bc-7ff3"><h1 class="topictitle1">Choosing the best combination of HDV display settings</h1>
</a></p></li></ul></div></div></div></div><div><p>Recording HDV in real time requires a powerful system with
settings optimized for maximum performance.</p>
</div>
<div id="WS5b3ccc516d4fbf351e63e3d117cbc988bc-7ff9" class="nochunk"><a name="WS5b3ccc516d4fbf351e63e3d117cbc988bc-7ff9"><!-- --></a><h2 class="topictitle2">Balancing video quality and system resources</h2><div><p>Everyone
wants to see the highest resolution and frame rate possible, but
some computers cannot process all the data. Maximizing the quality
of images requires the computer to analyze more video data, which
directly increases CPU usage. If CPU usage rises to 100% when you
are recording HDV, frames can be dropped. With HDV, frames aren’t
dropped individually, but in groups of pictures (GOPs), which consist
of up to 15 frames depending on the camera.</p>
<p>Capturing frame-complete recordings should be your highest priority.
If necessary, reduce the demand on the CPU by making some compromises
in the resolution and frame rate of the Field Monitor and analysis
panels. These settings affect only what you see in Adobe OnLocation;
the recorded HDV data stream is not compromised in any way.</p>
</div></div>
<div id="WS5b3ccc516d4fbf351e63e3d117cbc98bab-7fb0" class="nochunk"><a name="WS5b3ccc516d4fbf351e63e3d117cbc98bab-7fb0"><!-- --></a><h2 class="topictitle2">Adjust MPEG decompression</h2><div><p>Decompressing
an HDV camera’s MPEG stream for display and analysis is resource
intensive, much more so than for a DV stream. If Adobe OnLocation maximizes
CPU usage, sometimes, transient rectangular artifacts and dropped frames
occur. To avoid these issues, fine-tune MPEG decompression for your system.</p>
<ol><li><p>In the upper-right corner of the Field Monitor, click
the panel menu icon&#160;<img src="images/panel_menu_icon.png" />, and
choose HDV Live Monitoring.</p>
</li>
<li><p>Set the following options:</p>
<dl><dt class="dlterm">Resolution</dt>
<dd xmlns:fn="http://www.w3.org/2005/xpath-functions" xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:xs="http://www.w3.org/2001/XMLSchema">Controls which pixels are decoded and displayed.<dl><dt class="dlterm">Full</dt>
<dd>Uses all the YUV data for higher image quality.</dd><p class="dlseparator"></p><dt class="dlterm">Half</dt>
<dd>Uses half the YUV data for lower CPU usage.</dd><p class="dlseparator"></p></dl>
<div class="note"><span class="notetitle">Note:  </span>The Half setting also reduces the dimensions of
grabbed stills to one-quarter of the full-resolution size. (See <a href="WS5b3ccc516d4fbf351e63e3d117cbc98bab-7fcc.html">Grabbing still images</a>.)</div>
</dd><p class="dlseparator"></p><dt class="dlterm">Framerate</dt>
<dd xmlns:fn="http://www.w3.org/2005/xpath-functions" xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:xs="http://www.w3.org/2001/XMLSchema">Controls which frames are displayed and analyzed, effectively changing
the frame rate. MPEG frames use I-frame, P-frame, and B-frame types of
compression. I-frames are self-contained. P-frames are encoded with reference
to the preceding I-frame. B-frames are encoded with reference to
the other two frames.<dl><dt class="dlterm">Full</dt>
<dd>Displays all frame types, producing a full frame rate and
high quality.</dd><p class="dlseparator"></p><dt class="dlterm">Medium</dt>
<dd>Displays only I- and P-frames for moderate quality and CPU
usage. This setting produces roughly 15 frames per second (fps)
in NTSC and 12 fps in PAL.</dd><p class="dlseparator"></p><dt class="dlterm">Low</dt>
<dd>Displays only I-frames for the lowest CPU usage and quality.
The resulting frame rate ranges from 2 to 5 fps, depending on the
HDV camera.</dd><p class="dlseparator"></p></dl>
</dd><p class="dlseparator"></p></dl>
</li>
</ol>
</div></div>
<div id="WS5b3ccc516d4fbf351e63e3d117cbc988bc-7ff3" class="nochunk"><a name="WS5b3ccc516d4fbf351e63e3d117cbc988bc-7ff3"><!-- --></a><h2 class="topictitle2">Choosing the best combination of HDV display settings</h2><div><p>Choose the combination of Field Display
and HDV Live Monitoring settings based on the speed of your system.
Adobe recommends that you test different combinations to see what
best meets your needs. </p>
<p>As you test combinations, remember the following:</p>
<ul><li><p>HDV has a much higher native resolution than the Field
Monitor. So, you aren’t likely to notice a great difference when
you reduce either of the resolution-related settings (Field Display
and HDV Live Monitoring). However, if you reduce both of these settings,
the effects are much more noticeable.</p>
</li>
<li><p>Consider using different combinations of settings in different
circumstances. For example, consider that you’re setting up a shot,
and checking levels and focus. The value of full resolution and
frame rate sometimes outweighs the cost of image artifacts.</p>
</li>
</ul>
<div class="tip"><img src="images/tip_help.png" />To determine how different settings affect performance,
observe CPU usage in the Mac&#160;OS Activity Monitor or the
Performance Tab of the Windows Task Manager. (To locate the Activity
Monitor, choose Go&#160;&gt; Utilities in the Finder. To open
the Task Manager, press Ctrl+Shift+Esc.)</div><div xmlns:fn="http://www.w3.org/2005/xpath-functions" xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:xs="http://www.w3.org/2001/XMLSchema" class="fignone"><img alt="" id="rc_CPU_table" src="images/rc_CPU_table.png" /><div class="figdesc">Tradeoff between CPU usage, frame rate, and resolution with
all possible combinations of settings.</div><br /></div></div></div>


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