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<a name="gst-plugins-bad-plugins-fieldanalysis"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="gst-plugins-bad-plugins-fieldanalysis.top_of_page"></a>fieldanalysis</span></h2>
<p>fieldanalysis</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-fieldanalysis.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type"><a href="../glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-fieldanalysis.html#GstFieldAnalysis--block-height" title="The “block-height” property">block-height</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="../glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-fieldanalysis.html#GstFieldAnalysis--block-threshold" title="The “block-threshold” property">block-threshold</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="../glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-fieldanalysis.html#GstFieldAnalysis--block-width" title="The “block-width” property">block-width</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">FieldAnalysisCombMethod</span></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-fieldanalysis.html#GstFieldAnalysis--comb-method" title="The “comb-method” property">comb-method</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">GstFieldAnalysisFieldMetric</span></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-fieldanalysis.html#GstFieldAnalysis--field-metric" title="The “field-metric” property">field-metric</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="../glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-fieldanalysis.html#GstFieldAnalysis--field-threshold" title="The “field-threshold” property">field-threshold</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">GstFieldAnalysisFrameMetric</span></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-fieldanalysis.html#GstFieldAnalysis--frame-metric" title="The “frame-metric” property">frame-metric</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="../glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-fieldanalysis.html#GstFieldAnalysis--frame-threshold" title="The “frame-threshold” property">frame-threshold</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="../glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-fieldanalysis.html#GstFieldAnalysis--ignored-lines" title="The “ignored-lines” property">ignored-lines</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="../glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-fieldanalysis.html#GstFieldAnalysis--noise-floor" title="The “noise-floor” property">noise-floor</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="../glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-fieldanalysis.html#GstFieldAnalysis--spatial-threshold" title="The “spatial-threshold” property">spatial-threshold</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstFieldAnalysis"></a><div class="refsect1">
<a name="gst-plugins-bad-plugins-fieldanalysis.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-bad-plugins-fieldanalysis.html#GstFieldAnalysis-struct" title="struct GstFieldAnalysis">GstFieldAnalysis</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-fieldanalysis.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="../gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
<span class="lineart">╰──</span> <a href="../gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
<span class="lineart">╰──</span> <a href="../gstreamer-1.0/GstObject.html#GstObject-struct">GstObject</a>
<span class="lineart">╰──</span> <a href="../gstreamer-1.0/GstElement.html#GstElement-struct">GstElement</a>
<span class="lineart">╰──</span> GstFieldAnalysis
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-fieldanalysis.description"></a><h2>Description</h2>
<p>Analyse fields from video buffers to identify whether the buffers are
progressive/telecined/interlaced and, if telecined, the telecine pattern
used.</p>
<div class="refsect3">
<a name="id-1.2.91.7.3"></a><h4>Example launch line</h4>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> <span class="gtkdoc opt">-</span>v uridecodebin uri<span class="gtkdoc opt">=/</span>path<span class="gtkdoc opt">/</span>to<span class="gtkdoc opt">/</span>foo<span class="gtkdoc opt">.</span>bar <span class="gtkdoc opt">!</span> fieldanalysis <span class="gtkdoc opt">!</span> deinterlace <span class="gtkdoc opt">!</span> videoconvert <span class="gtkdoc opt">!</span> autovideosink</pre></td>
</tr>
</tbody>
</table>
</div>
<p> This pipeline will analyse a video stream with default metrics and thresholds and output progressive frames.</p>
</div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.91.7.4.1"></a><h3>Element Information</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">plugin</span></p></td>
<td>
<a class="link" href="gst-plugins-bad-plugins-plugin-fieldanalysis.html#plugin-fieldanalysis">fieldanalysis</a>
</td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Robert Swain <robert.swain@collabora.co.uk></td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Filter/Analysis/Video</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.91.7.4.2"></a><h3>Element Pads</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>sink</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>sink</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>always</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>video/x-raw, format=(string){ YUY2, UYVY, Y42B, I420, YV12 }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
</tbody>
</table></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>src</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>source</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>always</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>video/x-raw, format=(string){ YUY2, UYVY, Y42B, I420, YV12 }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-fieldanalysis.functions_details"></a><h2>Functions</h2>
<p></p>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-fieldanalysis.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstFieldAnalysis-struct"></a><h3>struct GstFieldAnalysis</h3>
<pre class="programlisting">struct GstFieldAnalysis;</pre>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-bad-plugins-fieldanalysis.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstFieldAnalysis--block-height"></a><h3>The <code class="literal">“block-height”</code> property</h3>
<pre class="programlisting"> “block-height” <a href="../glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre>
<p>Block height for windowed comb detection.</p>
<p>Flags: Read / Write</p>
<p>Default value: 16</p>
</div>
<hr>
<div class="refsect2">
<a name="GstFieldAnalysis--block-threshold"></a><h3>The <code class="literal">“block-threshold”</code> property</h3>
<pre class="programlisting"> “block-threshold” <a href="../glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre>
<p>Block threshold for windowed comb detection.</p>
<p>Flags: Read / Write</p>
<p>Default value: 80</p>
</div>
<hr>
<div class="refsect2">
<a name="GstFieldAnalysis--block-width"></a><h3>The <code class="literal">“block-width”</code> property</h3>
<pre class="programlisting"> “block-width” <a href="../glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre>
<p>Block width for windowed comb detection.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: >= 1</p>
<p>Default value: 16</p>
</div>
<hr>
<div class="refsect2">
<a name="GstFieldAnalysis--comb-method"></a><h3>The <code class="literal">“comb-method”</code> property</h3>
<pre class="programlisting"> “comb-method” <span class="type">FieldAnalysisCombMethod</span></pre>
<p>Metric to be used for identifying comb artifacts if using windowed comb detection.</p>
<p>Flags: Read / Write</p>
<p>Default value: 5-tap [1,-3,4,-3,1] vertical filter result is larger than spatial threshold*6</p>
</div>
<hr>
<div class="refsect2">
<a name="GstFieldAnalysis--field-metric"></a><h3>The <code class="literal">“field-metric”</code> property</h3>
<pre class="programlisting"> “field-metric” <span class="type">GstFieldAnalysisFieldMetric</span></pre>
<p>Metric to be used for comparing same parity fields to decide if they are a repeated field for telecine.</p>
<p>Flags: Read / Write</p>
<p>Default value: Sum of Squared Differences</p>
</div>
<hr>
<div class="refsect2">
<a name="GstFieldAnalysis--field-threshold"></a><h3>The <code class="literal">“field-threshold”</code> property</h3>
<pre class="programlisting"> “field-threshold” <a href="../glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a></pre>
<p>Threshold for field metric decisions.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: >= 0</p>
<p>Default value: 0.08</p>
</div>
<hr>
<div class="refsect2">
<a name="GstFieldAnalysis--frame-metric"></a><h3>The <code class="literal">“frame-metric”</code> property</h3>
<pre class="programlisting"> “frame-metric” <span class="type">GstFieldAnalysisFrameMetric</span></pre>
<p>Metric to be used for comparing opposite parity fields to decide if they are a progressive frame.</p>
<p>Flags: Read / Write</p>
<p>Default value: 5-tap [1,-3,4,-3,1] Vertical Filter</p>
</div>
<hr>
<div class="refsect2">
<a name="GstFieldAnalysis--frame-threshold"></a><h3>The <code class="literal">“frame-threshold”</code> property</h3>
<pre class="programlisting"> “frame-threshold” <a href="../glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a></pre>
<p>Threshold for frame metric decisions.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: >= 0</p>
<p>Default value: 0.002</p>
</div>
<hr>
<div class="refsect2">
<a name="GstFieldAnalysis--ignored-lines"></a><h3>The <code class="literal">“ignored-lines”</code> property</h3>
<pre class="programlisting"> “ignored-lines” <a href="../glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre>
<p>Ignore this many lines from the top and bottom for windowed comb detection.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: >= 2</p>
<p>Default value: 2</p>
</div>
<hr>
<div class="refsect2">
<a name="GstFieldAnalysis--noise-floor"></a><h3>The <code class="literal">“noise-floor”</code> property</h3>
<pre class="programlisting"> “noise-floor” <a href="../glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Noise floor for appropriate metrics (per-pixel metric values with a score less than this will be ignored).</p>
<p>Flags: Read / Write</p>
<p>Default value: 16</p>
</div>
<hr>
<div class="refsect2">
<a name="GstFieldAnalysis--spatial-threshold"></a><h3>The <code class="literal">“spatial-threshold”</code> property</h3>
<pre class="programlisting"> “spatial-threshold” <a href="../glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a></pre>
<p>Threshold for combing metric decisions.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: >= 0</p>
<p>Default value: 9</p>
</div>
</div>
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