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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>textoverlay: GStreamer Base Plugins 1.0 Plugins Reference Manual</title>
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<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#gst-plugins-base-plugins-textoverlay.description" class="shortcut">Description</a></span><span id="nav_hierarchy">  <span class="dim">|</span> 
                  <a href="#gst-plugins-base-plugins-textoverlay.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
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<div class="refentry">
<a name="gst-plugins-base-plugins-textoverlay"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-base-plugins-textoverlay.top_of_page"></a>textoverlay</span></h2>
<p>textoverlay</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<a name="GstTextOverlay"></a><div class="refsect1">
<a name="gst-plugins-base-plugins-textoverlay.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-base-plugins-textoverlay.html#GstTextOverlay-struct" title="struct GstTextOverlay">GstTextOverlay</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-textoverlay.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> GstBaseTextOverlay
                    <span class="lineart">╰──</span> GstTextOverlay
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-textoverlay.description"></a><h2>Description</h2>
<p>This plugin renders text on top of a video stream. This can be either
static text or text from buffers received on the text sink pad, e.g.
as produced by the subparse element. If the text sink pad is not linked,
the text set via the "text" property will be rendered. If the text sink
pad is linked, text will be rendered as it is received on that pad,
honouring and matching the buffer timestamps of both input streams.</p>
<p>The text can contain newline characters and text wrapping is enabled by
default.</p>
<div class="refsect3">
<a name="id-1.2.90.6.4"></a><h4>Example launch lines</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 videotestsrc <span class="gtkdoc opt">!</span> textoverlay text<span class="gtkdoc opt">=</span><span class="string">&quot;Room A&quot;</span> valignment<span class="gtkdoc opt">=</span>top halignment<span class="gtkdoc opt">=</span>left font<span class="gtkdoc opt">-</span>desc<span class="gtkdoc opt">=</span><span class="string">&quot;Sans, 72&quot;</span> <span class="gtkdoc opt">!</span> autovideosink</pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p>
Here is a simple pipeline that displays a static text in the top left
corner of the video picture</p>
<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 filesrc location<span class="gtkdoc opt">=</span>subtitles<span class="gtkdoc opt">.</span>srt <span class="gtkdoc opt">!</span> subparse <span class="gtkdoc opt">!</span> txt<span class="gtkdoc opt">.</span>   videotestsrc <span class="gtkdoc opt">!</span> timeoverlay <span class="gtkdoc opt">!</span> textoverlay name<span class="gtkdoc opt">=</span>txt shaded<span class="gtkdoc opt">-</span>background<span class="gtkdoc opt">=</span>yes <span class="gtkdoc opt">!</span> autovideosink</pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p>
Here is another pipeline that displays subtitles from an .srt subtitle
file, centered at the bottom of the picture and with a rectangular shading
around the text in the background:</p>
<p>If you do not have such a subtitle file, create one looking like this
in a text editor:</p>
<div class="informalexample">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13</pre></td>
        <td class="listing_code"><pre class="programlisting"><span class="number">1</span>
<span class="number">00</span><span class="gtkdoc opt">:</span><span class="number">00</span><span class="gtkdoc opt">:</span><span class="number">03</span><span class="gtkdoc opt">,</span><span class="number">000</span> <span class="gtkdoc opt">--&gt;</span> <span class="number">00</span><span class="gtkdoc opt">:</span><span class="number">00</span><span class="gtkdoc opt">:</span><span class="number">05</span><span class="gtkdoc opt">,</span><span class="number">000</span>
Hello<span class="gtkdoc opt">? (</span><span class="number">3</span><span class="gtkdoc opt">-</span><span class="number">5</span>s<span class="gtkdoc opt">)</span>

<span class="number">2</span>
<span class="number">00</span><span class="gtkdoc opt">:</span><span class="number">00</span><span class="gtkdoc opt">:</span><span class="number">08</span><span class="gtkdoc opt">,</span><span class="number">000</span> <span class="gtkdoc opt">--&gt;</span> <span class="number">00</span><span class="gtkdoc opt">:</span><span class="number">00</span><span class="gtkdoc opt">:</span><span class="number">13</span><span class="gtkdoc opt">,</span><span class="number">000</span>
Yes<span class="gtkdoc opt">,</span> <span class="keyword">this</span> is a subtitle<span class="gtkdoc opt">.</span> Don<span class="string">&apos;t</span>
<span class="string">you like it? (8-13s)</span>
<span class="string"></span>
<span class="string">3</span>
<span class="string">00:00:18,826 --&gt; 00:01:02,886</span>
<span class="string">Uh? What are you talking about?</span>
<span class="string">I don&apos;</span>t <span class="function">understand</span>  <span class="gtkdoc opt">(</span><span class="number">18</span><span class="gtkdoc opt">-</span><span class="number">62</span>s<span class="gtkdoc opt">)</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p></p>
</div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.90.6.5.1"></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-base-plugins-plugin-pango.html#plugin-pango">pango</a>
          </td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>David Schleef &lt;ds@schleef.org&gt;, Zeeshan Ali &lt;zeeshan.ali@nokia.com&gt;</td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Filter/Editor/Video</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.90.6.5.2"></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>text_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>text/x-raw, format=(string){ pango-markup, utf8 }</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>video_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){ BGRx, RGBx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR, I420, YV12, AYUV, YUY2, UYVY, v308, Y41B, Y42B, Y444, NV12, NV21, A420, YUV9, YVU9, IYU1, GRAY8 }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-raw(ANY), format=(string){ I420, YV12, YUY2, UYVY, AYUV, RGBx, BGRx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR, Y41B, Y42B, YVYU, Y444, v210, v216, NV12, NV21, GRAY8, GRAY16_BE, GRAY16_LE, v308, RGB16, BGR16, RGB15, BGR15, UYVP, A420, RGB8P, YUV9, YVU9, IYU1, ARGB64, AYUV64, r210, I420_10BE, I420_10LE, I422_10BE, I422_10LE, Y444_10BE, Y444_10LE, GBR, GBR_10BE, GBR_10LE, NV16, NV24, NV12_64Z32, A420_10BE, A420_10LE, A422_10BE, A422_10LE, A444_10BE, A444_10LE, NV61, P010_10BE, P010_10LE, IYU2, VYUY, GBRA, GBRA_10BE, GBRA_10LE, GBR_12BE, GBR_12LE, GBRA_12BE, GBRA_12LE, I420_12BE, I420_12LE, I422_12BE, I422_12LE, Y444_12BE, Y444_12LE, GRAY10_LE32, NV12_10LE32, NV16_10LE32 }, 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){ BGRx, RGBx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR, I420, YV12, AYUV, YUY2, UYVY, v308, Y41B, Y42B, Y444, NV12, NV21, A420, YUV9, YVU9, IYU1, GRAY8 }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td>
</tr>
<tr>
<td><p><span class="term"></span></p></td>
<td> video/x-raw(ANY), format=(string){ I420, YV12, YUY2, UYVY, AYUV, RGBx, BGRx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR, Y41B, Y42B, YVYU, Y444, v210, v216, NV12, NV21, GRAY8, GRAY16_BE, GRAY16_LE, v308, RGB16, BGR16, RGB15, BGR15, UYVP, A420, RGB8P, YUV9, YVU9, IYU1, ARGB64, AYUV64, r210, I420_10BE, I420_10LE, I422_10BE, I422_10LE, Y444_10BE, Y444_10LE, GBR, GBR_10BE, GBR_10LE, NV16, NV24, NV12_64Z32, A420_10BE, A420_10LE, A422_10BE, A422_10LE, A444_10BE, A444_10LE, NV61, P010_10BE, P010_10LE, IYU2, VYUY, GBRA, GBRA_10BE, GBRA_10LE, GBR_12BE, GBR_12LE, GBRA_12BE, GBRA_12LE, I420_12BE, I420_12LE, I422_12BE, I422_12LE, Y444_12BE, Y444_12LE, GRAY10_LE32, NV12_10LE32, NV16_10LE32 }, 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-base-plugins-textoverlay.functions_details"></a><h2>Functions</h2>
<p></p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-textoverlay.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstTextOverlay-struct"></a><h3>struct GstTextOverlay</h3>
<pre class="programlisting">struct GstTextOverlay;</pre>
<p>Opaque textoverlay data structure.</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-plugins-textoverlay.see-also"></a><h2>See Also</h2>
<p><a class="link" href="gst-plugins-base-plugins-textrender.html#GstTextRender"><span class="type">GstTextRender</span></a>, <a class="link" href="gst-plugins-base-plugins-textoverlay.html#GstTextOverlay"><span class="type">GstTextOverlay</span></a>, <a class="link" href="gst-plugins-base-plugins-timeoverlay.html#GstTimeOverlay"><span class="type">GstTimeOverlay</span></a>, <a class="link" href="gst-plugins-base-plugins-subparse.html#GstSubParse"><span class="type">GstSubParse</span></a></p>
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