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| <a href="#gst-plugins-good-plugins-ismlmux.synopsis" class="shortcut">Top</a> |
| | |
| <a href="#gst-plugins-good-plugins-ismlmux.description" class="shortcut">Description</a> |
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| <div class="refentry"> |
| <a name="gst-plugins-good-plugins-ismlmux"></a><div class="titlepage"></div> |
| <div class="refnamediv"><table width="100%"><tr> |
| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="gst-plugins-good-plugins-ismlmux.top_of_page"></a>ismlmux</span></h2> |
| <p>ismlmux — Muxer for ISML smooth streaming (.isml) files</p> |
| </td> |
| <td valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsynopsisdiv"> |
| <a name="gst-plugins-good-plugins-ismlmux.synopsis"></a><h2>Synopsis</h2> |
| <pre class="synopsis"></pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-good-plugins-ismlmux.description"></a><h2>Description</h2> |
| <p> |
| This element merges streams (audio and video) into MJ2 (.mj2) files. |
| </p> |
| <p> |
| The following background intends to explain why various similar muxers |
| are present in this plugin. |
| </p> |
| <p> |
| The <a class="ulink" href="http://www.apple.com/quicktime/resources/qtfileformat.pdf" target="_top"> |
| QuickTime file format specification</a> served as basis for the MP4 file |
| format specification (mp4mux), and as such the QuickTime file structure is |
| nearly identical to the so-called ISO Base Media file format defined in |
| ISO 14496-12 (except for some media specific parts). |
| In turn, the latter ISO Base Media format was further specialized as a |
| Motion JPEG-2000 file format in ISO 15444-3 (mj2mux) |
| and in various 3GPP(2) specs (3gppmux). |
| The fragmented file features defined (only) in ISO Base Media are used by |
| ISMV files making up (a.o.) Smooth Streaming (ismlmux). |
| </p> |
| <p> |
| A few properties (movie-timescale, |
| trak-timescale) allow adjusting |
| some technical parameters, which might be useful in (rare) cases to resolve |
| compatibility issues in some situations. |
| </p> |
| <p> |
| Some other properties influence the result more fundamentally. |
| A typical mov/mp4 file's metadata (aka moov) is located at the end of the file, |
| somewhat contrary to this usually being called "the header". |
| However, a faststart file will |
| (with some effort) arrange this to be located near start of the file, |
| which then allows it e.g. to be played while downloading. |
| Alternatively, rather than having one chunk of metadata at start (or end), |
| there can be some metadata at start and most of the other data can be spread |
| out into fragments of fragment-duration. |
| If such fragmented layout is intended for streaming purposes, then |
| streamable allows foregoing to add |
| index metadata (at the end of file). |
| </p> |
| <p> |
| dts-method allows selecting a |
| method for managing input timestamps (stay tuned for 0.11 to have this |
| automagically settled). The default delta/duration method should handle nice |
| (aka perfect streams) just fine, but may experience problems otherwise |
| (e.g. input stream with re-ordered B-frames and/or with frame dropping). |
| The re-ordering approach re-assigns incoming timestamps in ascending order |
| to incoming buffers and offers an alternative in such cases. In cases where |
| that might fail, the remaining method can be tried, which is exact and |
| according to specs, but might experience playback on not so spec-wise players. |
| Note that this latter approach also requires one to enable |
| presentation-timestamp. |
| </p> |
| <p> |
| </p> |
| <div class="refsect2"> |
| <a name="idp16026864"></a><h3>Example pipelines</h3> |
| <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> v4l2src num<span class="gtkdoc opt">-</span>buffers<span class="gtkdoc opt">=</span><span class="number">50</span> <span class="gtkdoc opt">!</span> queue <span class="gtkdoc opt">!</span> jp2kenc <span class="gtkdoc opt">!</span> mj2mux <span class="gtkdoc opt">!</span> filesink location<span class="gtkdoc opt">=</span>video<span class="gtkdoc opt">.</span>mj2</pre></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| |
| Records a video stream captured from a v4l2 device, encodes it into JPEG-2000 |
| and muxes it into an mj2 file. |
| </div> |
| <p> |
| </p> |
| <p> |
| Documentation last reviewed on 2011-04-21 |
| </p> |
| <div class="refsynopsisdiv"> |
| <h2>Synopsis</h2> |
| <div class="refsect2"> |
| <a name="idp12350720"></a><h3>Element Information</h3> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term">plugin</span></p></td> |
| <td> |
| <a class="link" href="gst-plugins-good-plugins-plugin-isomp4.html#plugin-isomp4">isomp4</a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term">author</span></p></td> |
| <td>Thiago Sousa Santos <thiagoss@embedded.ufcg.edu.br></td> |
| </tr> |
| <tr> |
| <td><p><span class="term">class</span></p></td> |
| <td>Codec/Muxer</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="idp14982896"></a><h3>Element Pads</h3> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term">name</span></p></td> |
| <td>audio_%u</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>request</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">details</span></p></td> |
| <td>audio/mpeg, mpegversion=(int)1, layer=(int)3, channels=(int)[ 1, 2 ], rate=(int)[ 1, 2147483647 ]</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"></span></p></td> |
| <td> audio/mpeg, mpegversion=(int)4, stream-format=(string)raw, channels=(int)[ 1, 8 ], rate=(int)[ 1, 2147483647 ]</td> |
| </tr> |
| </tbody> |
| </table></div> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term">name</span></p></td> |
| <td>video_%u</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>request</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">details</span></p></td> |
| <td>video/mpeg, mpegversion=(int)4, systemstream=(boolean)false, width=(int)[ 16, 4096 ], height=(int)[ 16, 4096 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"></span></p></td> |
| <td> video/x-divx, divxversion=(int)5, width=(int)[ 16, 4096 ], height=(int)[ 16, 4096 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td> |
| </tr> |
| <tr> |
| <td><p><span class="term"></span></p></td> |
| <td> video/x-h264, stream-format=(string)avc, alignment=(string)au, width=(int)[ 16, 4096 ], height=(int)[ 16, 4096 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td> |
| </tr> |
| </tbody> |
| </table></div> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <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/quicktime, variant=(string)iso-fragmented</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <p> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-good-plugins-ismlmux.details"></a><h2>Details</h2> |
| </div> |
| </div> |
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