docs/plugins/html/gst-plugins-base-plugins-encodebin.html

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  24 <a href="#gst-plugins-base-plugins-encodebin.synopsis" class="shortcut">Top</a>
  25                    |
  26                   <a href="#gst-plugins-base-plugins-encodebin.description" class="shortcut">Description</a>
  27                    |
  28                   <a href="#gst-plugins-base-plugins-encodebin.object-hierarchy" class="shortcut">Object Hierarchy</a>
  29                    |
  30                   <a href="#gst-plugins-base-plugins-encodebin.implemented-interfaces" class="shortcut">Implemented Interfaces</a>
  31                    |
  32                   <a href="#gst-plugins-base-plugins-encodebin.properties" class="shortcut">Properties</a>
  33                    |
  34                   <a href="#gst-plugins-base-plugins-encodebin.signals" class="shortcut">Signals</a>
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  37 <div class="refentry">
  38 <a name="gst-plugins-base-plugins-encodebin"></a><div class="titlepage"></div>
  39 <div class="refnamediv"><table width="100%"><tr>
  40 <td valign="top">
  41 <h2><span class="refentrytitle"><a name="gst-plugins-base-plugins-encodebin.top_of_page"></a>encodebin</span></h2>
  42 <p>encodebin — Convenience encoding/muxing element</p>
  43 </td>
  44 <td valign="top" align="right"></td>
  45 </tr></table></div>
  46 <div class="refsynopsisdiv">
  47 <a name="gst-plugins-base-plugins-encodebin.synopsis"></a><h2>Synopsis</h2>
  48 <a name="GstEncodeBin"></a><pre class="synopsis">                    <a class="link" href="gst-plugins-base-plugins-encodebin.html#GstEncodeBin-struct" title="GstEncodeBin">GstEncodeBin</a>;
  49 </pre>
  50 </div>
  51 <div class="refsect1">
  52 <a name="gst-plugins-base-plugins-encodebin.object-hierarchy"></a><h2>Object Hierarchy</h2>
  53 <pre class="synopsis">
  54   <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
  55    +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html">GstObject</a>
  56          +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html">GstElement</a>
  57                +----<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstBin.html">GstBin</a>
  58                      +----GstEncodeBin
  59 </pre>
  60 </div>
  61 <div class="refsect1">
  62 <a name="gst-plugins-base-plugins-encodebin.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
  63 <p>
  64 GstEncodeBin implements
  65  <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstChildProxy.html">GstChildProxy</a>.</p>
  66 </div>
  67 <div class="refsect1">
  68 <a name="gst-plugins-base-plugins-encodebin.properties"></a><h2>Properties</h2>
  69 <pre class="synopsis">
  70   "<a class="link" href="gst-plugins-base-plugins-encodebin.html#GstEncodeBin--audio-jitter-tolerance" title='The "audio-jitter-tolerance" property'>audio-jitter-tolerance</a>"   <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a>               : Read / Write
  71   "<a class="link" href="gst-plugins-base-plugins-encodebin.html#GstEncodeBin--avoid-reencoding" title='The "avoid-reencoding" property'>avoid-reencoding</a>"         <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write
  72   "<a class="link" href="gst-plugins-base-plugins-encodebin.html#GstEncodeBin--profile" title='The "profile" property'>profile</a>"                  <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-encoding-profile.html#GstEncodingProfile"><span class="type">GstEncodingProfile</span></a>*   : Read / Write
  73   "<a class="link" href="gst-plugins-base-plugins-encodebin.html#GstEncodeBin--queue-buffers-max" title='The "queue-buffers-max" property'>queue-buffers-max</a>"        <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a>                 : Read / Write
  74   "<a class="link" href="gst-plugins-base-plugins-encodebin.html#GstEncodeBin--queue-bytes-max" title='The "queue-bytes-max" property'>queue-bytes-max</a>"          <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a>                 : Read / Write
  75   "<a class="link" href="gst-plugins-base-plugins-encodebin.html#GstEncodeBin--queue-time-max" title='The "queue-time-max" property'>queue-time-max</a>"           <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a>               : Read / Write
  76 </pre>
  77 </div>
  78 <div class="refsect1">
  79 <a name="gst-plugins-base-plugins-encodebin.signals"></a><h2>Signals</h2>
  80 <pre class="synopsis">
  81   "<a class="link" href="gst-plugins-base-plugins-encodebin.html#GstEncodeBin-request-pad" title='The "request-pad" signal'>request-pad</a>"                                    : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-ACTION:CAPS"><code class="literal">Action</code></a>
  82 </pre>
  83 </div>
  84 <div class="refsect1">
  85 <a name="gst-plugins-base-plugins-encodebin.description"></a><h2>Description</h2>
  86 <p>
  87 EncodeBin provides a bin for encoding/muxing various streams according to
  88 a specified <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-encoding-profile.html#GstEncodingProfile"><span class="type">GstEncodingProfile</span></a>.
  89 </p>
  90 <p>
  91 Based on the profile that was set (via the <a class="link" href="gst-plugins-base-plugins-encodebin.html#GstEncodeBin--profile" title='The "profile" property'><span class="type">"profile"</span></a> property),
  92 EncodeBin will internally select and configure the required elements
  93 (encoders, muxers, but also audio and video converters) so that you can
  94 provide it raw or pre-encoded streams of data in input and have your
  95 encoded/muxed/converted stream in output.
  96 </p>
  97 <p>
  98 </p>
  99 <div class="refsect2">
 100 <a name="idp6809216"></a><h3>Features</h3>
 101 <div class="itemizedlist"><ul class="itemizedlist" type="disc">
 102 <li class="listitem">
 103 Automatic encoder and muxer selection based on elements available on the
 104 system.
 105 </li>
 106 <li class="listitem">
 107 Conversion of raw audio/video streams (scaling, framerate conversion,
 108 colorspace conversion, samplerate conversion) to conform to the profile
 109 output format.
 110 </li>
 111 <li class="listitem">
 112 Variable number of streams. If the presence property for a stream encoding
 113 profile is 0, you can request any number of sink pads for it via the
 114 standard request pad gstreamer API or the <a class="link" href="gst-plugins-base-plugins-encodebin.html#GstEncodeBin-request-pad" title='The "request-pad" signal'><span class="type">"request-pad"</span></a> action
 115 signal.
 116 </li>
 117 <li class="listitem">
 118 Avoid reencoding (passthrough). If the input stream is already encoded and is
 119 compatible with what the <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-encoding-profile.html#GstEncodingProfile"><span class="type">GstEncodingProfile</span></a> expects, then the stream won't
 120 be re-encoded but just passed through downstream to the muxer or the output.
 121 </li>
 122 <li class="listitem">
 123 Mix pre-encoded and raw streams as input. In addition to the passthrough
 124 feature above, you can feed both raw audio/video *AND* already-encoded data
 125 to a pad. <a class="link" href="gst-plugins-base-plugins-encodebin.html#GstEncodeBin"><span class="type">GstEncodeBin</span></a> will take care of passing through the compatible
 126 segments and re-encoding the segments of media that need encoding.
 127 </li>
 128 <li class="listitem">
 129 Standard behaviour is to use a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-encoding-profile.html#GstEncodingContainerProfile"><span class="type">GstEncodingContainerProfile</span></a> to have both
 130 encoding and muxing performed. But you can also provide a single stream
 131 profile (like <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-encoding-profile.html#GstEncodingAudioProfile"><span class="type">GstEncodingAudioProfile</span></a>) to only have the encoding done and
 132 handle the encoded output yourself.
 133 </li>
 134 <li class="listitem">
 135 Audio imperfection corrections. Incoming audio streams can have non perfect
 136 timestamps (jitter), like the streams coming from ASF files. <a class="link" href="gst-plugins-base-plugins-encodebin.html#GstEncodeBin"><span class="type">GstEncodeBin</span></a>
 137 will automatically fix those imperfections for you. See
 138 <a class="link" href="gst-plugins-base-plugins-encodebin.html#GstEncodeBin--audio-jitter-tolerance" title='The "audio-jitter-tolerance" property'><span class="type">"audio-jitter-tolerance"</span></a> for more details.
 139 </li>
 140 <li class="listitem">
 141 Variable or Constant video framerate. If your <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-encoding-profile.html#GstEncodingVideoProfile"><span class="type">GstEncodingVideoProfile</span></a> has
 142 the variableframerate property deactivated (default), then the incoming
 143 raw video stream will be retimestampped in order to produce a constant
 144 framerate.
 145 </li>
 146 <li class="listitem">
 147 Cross-boundary re-encoding. When feeding compatible pre-encoded streams that
 148 fall on segment boundaries, and for supported formats (right now only H263),
 149 the GOP will be decoded/reencoded when needed to produce an encoded output
 150 that fits exactly within the request GstSegment.
 151 </li>
 152 <li class="listitem">
 153 Missing plugin support. If a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html"><span class="type">GstElement</span></a> is missing to encode/mux to the
 154 request profile formats, a missing-plugin <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMessage.html#GstMessage"><span class="type">GstMessage</span></a> will be posted on the
 155 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstBus.html"><span class="type">GstBus</span></a>, allowing systems that support the missing-plugin system to offer the
 156 user a way to install the missing element.
 157 </li>
 158 </ul></div>
 159 </div>
 160 <p>
 161 </p>
 162 <div class="refsynopsisdiv">
 163 <h2>Synopsis</h2>
 164 <div class="refsect2">
 165 <a name="idp11211984"></a><h3>Element Information</h3>
 166 <div class="variablelist"><table border="0">
 167 <col align="left" valign="top">
 168 <tbody>
 169 <tr>
 170 <td><p><span class="term">plugin</span></p></td>
 171 <td>
 172             <a class="link" href="gst-plugins-base-plugins-plugin-encoding.html#plugin-encoding">encoding</a>
 173           </td>
 174 </tr>
 175 <tr>
 176 <td><p><span class="term">author</span></p></td>
 177 <td>Edward Hervey &lt;edward.hervey@collabora.co.uk&gt;</td>
 178 </tr>
 179 <tr>
 180 <td><p><span class="term">class</span></p></td>
 181 <td>Generic/Bin/Encoder</td>
 182 </tr>
 183 </tbody>
 184 </table></div>
 185 </div>
 186 <hr>
 187 <div class="refsect2">
 188 <a name="idp11219392"></a><h3>Element Pads</h3>
 189 <div class="variablelist"><table border="0">
 190 <col align="left" valign="top">
 191 <tbody>
 192 <tr>
 193 <td><p><span class="term">name</span></p></td>
 194 <td>audio_%d</td>
 195 </tr>
 196 <tr>
 197 <td><p><span class="term">direction</span></p></td>
 198 <td>sink</td>
 199 </tr>
 200 <tr>
 201 <td><p><span class="term">presence</span></p></td>
 202 <td>request</td>
 203 </tr>
 204 <tr>
 205 <td><p><span class="term">details</span></p></td>
 206 <td>ANY</td>
 207 </tr>
 208 </tbody>
 209 </table></div>
 210 <div class="variablelist"><table border="0">
 211 <col align="left" valign="top">
 212 <tbody>
 213 <tr>
 214 <td><p><span class="term">name</span></p></td>
 215 <td>private_%d</td>
 216 </tr>
 217 <tr>
 218 <td><p><span class="term">direction</span></p></td>
 219 <td>sink</td>
 220 </tr>
 221 <tr>
 222 <td><p><span class="term">presence</span></p></td>
 223 <td>request</td>
 224 </tr>
 225 <tr>
 226 <td><p><span class="term">details</span></p></td>
 227 <td>ANY</td>
 228 </tr>
 229 </tbody>
 230 </table></div>
 231 <div class="variablelist"><table border="0">
 232 <col align="left" valign="top">
 233 <tbody>
 234 <tr>
 235 <td><p><span class="term">name</span></p></td>
 236 <td>video_%d</td>
 237 </tr>
 238 <tr>
 239 <td><p><span class="term">direction</span></p></td>
 240 <td>sink</td>
 241 </tr>
 242 <tr>
 243 <td><p><span class="term">presence</span></p></td>
 244 <td>request</td>
 245 </tr>
 246 <tr>
 247 <td><p><span class="term">details</span></p></td>
 248 <td>ANY</td>
 249 </tr>
 250 </tbody>
 251 </table></div>
 252 <div class="variablelist"><table border="0">
 253 <col align="left" valign="top">
 254 <tbody>
 255 <tr>
 256 <td><p><span class="term">name</span></p></td>
 257 <td>src</td>
 258 </tr>
 259 <tr>
 260 <td><p><span class="term">direction</span></p></td>
 261 <td>source</td>
 262 </tr>
 263 <tr>
 264 <td><p><span class="term">presence</span></p></td>
 265 <td>always</td>
 266 </tr>
 267 <tr>
 268 <td><p><span class="term">details</span></p></td>
 269 <td>ANY</td>
 270 </tr>
 271 </tbody>
 272 </table></div>
 273 </div>
 274 </div>
 275 <p>
 276 </p>
 277 </div>
 278 <div class="refsect1">
 279 <a name="gst-plugins-base-plugins-encodebin.details"></a><h2>Details</h2>
 280 <div class="refsect2">
 281 <a name="GstEncodeBin-struct"></a><h3>GstEncodeBin</h3>
 282 <pre class="programlisting">typedef struct _GstEncodeBin GstEncodeBin;</pre>
 283 <p>
 284 </p>
 285 </div>
 286 </div>
 287 <div class="refsect1">
 288 <a name="gst-plugins-base-plugins-encodebin.property-details"></a><h2>Property Details</h2>
 289 <div class="refsect2">
 290 <a name="GstEncodeBin--audio-jitter-tolerance"></a><h3>The <code class="literal">"audio-jitter-tolerance"</code> property</h3>
 291 <pre class="programlisting">  "audio-jitter-tolerance"   <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a>               : Read / Write</pre>
 292 <p>Amount of timestamp jitter/imperfection to allow on audio streams before inserting/dropping samples (ns).</p>
 293 <p>Default value: 20000000</p>
 294 </div>
 295 <hr>
 296 <div class="refsect2">
 297 <a name="GstEncodeBin--avoid-reencoding"></a><h3>The <code class="literal">"avoid-reencoding"</code> property</h3>
 298 <pre class="programlisting">  "avoid-reencoding"         <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write</pre>
 299 <p>Whether to re-encode portions of compatible video streams that lay on segment boundaries.</p>
 300 <p>Default value: FALSE</p>
 301 </div>
 302 <hr>
 303 <div class="refsect2">
 304 <a name="GstEncodeBin--profile"></a><h3>The <code class="literal">"profile"</code> property</h3>
 305 <pre class="programlisting">  "profile"                  <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-encoding-profile.html#GstEncodingProfile"><span class="type">GstEncodingProfile</span></a>*   : Read / Write</pre>
 306 <p>
 307 The <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-encoding-profile.html#GstEncodingProfile"><span class="type">GstEncodingProfile</span></a> to use. This property must be set before going
 308 to <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#GST-STATE-PAUSED:CAPS"><code class="literal">GST_STATE_PAUSED</code></a> or higher.
 309 </p>
 310 </div>
 311 <hr>
 312 <div class="refsect2">
 313 <a name="GstEncodeBin--queue-buffers-max"></a><h3>The <code class="literal">"queue-buffers-max"</code> property</h3>
 314 <pre class="programlisting">  "queue-buffers-max"        <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a>                 : Read / Write</pre>
 315 <p>Max. number of buffers in the queue (0=disable).</p>
 316 <p>Default value: 200</p>
 317 </div>
 318 <hr>
 319 <div class="refsect2">
 320 <a name="GstEncodeBin--queue-bytes-max"></a><h3>The <code class="literal">"queue-bytes-max"</code> property</h3>
 321 <pre class="programlisting">  "queue-bytes-max"          <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a>                 : Read / Write</pre>
 322 <p>Max. amount of data in the queue (bytes, 0=disable).</p>
 323 <p>Default value: 10485760</p>
 324 </div>
 325 <hr>
 326 <div class="refsect2">
 327 <a name="GstEncodeBin--queue-time-max"></a><h3>The <code class="literal">"queue-time-max"</code> property</h3>
 328 <pre class="programlisting">  "queue-time-max"           <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a>               : Read / Write</pre>
 329 <p>Max. amount of data in the queue (in ns, 0=disable).</p>
 330 <p>Default value: 1000000000</p>
 331 </div>
 332 </div>
 333 <div class="refsect1">
 334 <a name="gst-plugins-base-plugins-encodebin.signal-details"></a><h2>Signal Details</h2>
 335 <div class="refsect2">
 336 <a name="GstEncodeBin-request-pad"></a><h3>The <code class="literal">"request-pad"</code> signal</h3>
 337 <pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html"><span class="returnvalue">GstPad</span></a>*             user_function                      (<a class="link" href="gst-plugins-base-plugins-encodebin.html#GstEncodeBin"><span class="type">GstEncodeBin</span></a> *encodebin,
 338                                                         <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a>      *caps,
 339                                                         <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>      user_data)      : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-ACTION:CAPS"><code class="literal">Action</code></a></pre>
 340 <p>
 341 Use this method to request an unused sink request <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html"><span class="type">GstPad</span></a> that can take the
 342 provided <em class="parameter"><code>caps</code></em> as input. You must release the pad with
 343 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#gst-element-release-request-pad"><code class="function">gst_element_release_request_pad()</code></a> when you are done with it.
 344 </p>
 345 <div class="variablelist"><table border="0">
 346 <col align="left" valign="top">
 347 <tbody>
 348 <tr>
 349 <td><p><span class="term"><em class="parameter"><code>encodebin</code></em> :</span></p></td>
 350 <td>a <a class="link" href="gst-plugins-base-plugins-encodebin.html#GstEncodeBin"><span class="type">GstEncodeBin</span></a> instance</td>
 351 </tr>
 352 <tr>
 353 <td><p><span class="term"><em class="parameter"><code>caps</code></em> :</span></p></td>
 354 <td>a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a>
 355 </td>
 356 </tr>
 357 <tr>
 358 <td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
 359 <td>user data set when the signal handler was connected.</td>
 360 </tr>
 361 <tr>
 362 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 363 <td>A compatible <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html"><span class="type">GstPad</span></a>, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if no compatible <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html"><span class="type">GstPad</span></a> could be
 364 created or is available.</td>
 365 </tr>
 366 </tbody>
 367 </table></div>
 368 </div>
 369 </div>
 370 </div>
 371 <div class="footer">
 372 <hr>
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