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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<h1>Video encoding<br>
<small>
[<a class="el" href="group__video.html">Video</a>]</small>
</h1>Video related definitions and functions (writing).
<a href="#_details">More...</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__video__encode.html#g5fcd6798e3cb48f68df0b3209c9c5fc8">quicktime_set_framerate</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, double framerate)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the framerate for encoding. <a href="#g5fcd6798e3cb48f68df0b3209c9c5fc8"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__video__encode.html#gc966ea427e815bd69939c9aed6d5bb9b">quicktime_set_video</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int tracks, int frame_w, int frame_h, double frame_rate, char *compressor)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set up video tracks for encoding. <a href="#gc966ea427e815bd69939c9aed6d5bb9b"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__video__encode.html#gfa3865194b41bb5272bac9e728792017">quicktime_set_jpeg</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int quality, int use_float)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set jpeg encoding quality. <a href="#gfa3865194b41bb5272bac9e728792017"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__video__encode.html#g5ed4b88578d7d510b49e1c0595b38b34">quicktime_set_parameter</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, char *key, void *value)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set a codec parameter. <a href="#g5ed4b88578d7d510b49e1c0595b38b34"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__video__encode.html#g052604d9a1276535d4565cf4a87e3a69">quicktime_set_depth</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int depth, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the depth of a video track. <a href="#g052604d9a1276535d4565cf4a87e3a69"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__video__encode.html#gae812955dccd1fe331a8de99de858421">quicktime_write_frame</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, uint8_t *video_buffer, int64_t bytes, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Write a compressed video frame. <a href="#gae812955dccd1fe331a8de99de858421"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__video__encode.html#g1819c497a934a07c6dc18abfd91b0a91">quicktime_writes_cmodel</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int colormodel, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Check if a colormodel is supported for encoding. <a href="#g1819c497a934a07c6dc18abfd91b0a91"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__video__encode.html#g8b8200cfc5a091faf3711b19748f5ce0">quicktime_encode_video</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, unsigned char **row_pointers, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Encode a video frame. <a href="#g8b8200cfc5a091faf3711b19748f5ce0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__video__encode.html#g142548c45ec62ff7ede9505752719f81">lqt_set_pixel_aspect</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int track, int pixel_width, int pixel_height)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the pixel aspect ratio of a video track. <a href="#g142548c45ec62ff7ede9505752719f81"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__video__encode.html#g3f1efc3165641e10d2769f9ee4afacef">lqt_set_interlace_mode</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int track, <a class="el" href="group__video.html#g58950c90660f8709fa724f19afe83c7b">lqt_interlace_mode_t</a> mode)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the interlace mode. <a href="#g3f1efc3165641e10d2769f9ee4afacef"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__video__encode.html#ge267dccca78aec8134cb70b132ea00ea">lqt_set_video</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int tracks, int frame_w, int frame_h, int frame_duration, int timescale, <a class="el" href="structlqt__codec__info__t.html">lqt_codec_info_t</a> *codec_info)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set up video tracks for encoding. <a href="#ge267dccca78aec8134cb70b132ea00ea"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__video__encode.html#gb61ca630dabd16cd5d493b87aca71886">lqt_add_video_track</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int frame_w, int frame_h, int frame_duration, int timescale, <a class="el" href="structlqt__codec__info__t.html">lqt_codec_info_t</a> *codec_info)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Add a video track for encoding. <a href="#gb61ca630dabd16cd5d493b87aca71886"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__video__encode.html#ge4156fc8685ce49d51d08ac78bb0275c">lqt_set_video_pass</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int pass, int total_passes, const char *stats_file, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Enable multipass encoding. <a href="#ge4156fc8685ce49d51d08ac78bb0275c"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__video__encode.html#gd5d2f5fcdbd3237e8cfb4cdc37df91b6">lqt_encode_video</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, unsigned char **row_pointers, int track, int64_t time)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Encode one video frame. <a href="#gd5d2f5fcdbd3237e8cfb4cdc37df91b6"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Video related definitions and functions (writing).
<p>
The video API changed a lot during the last years (causing lot of confusion), so here is the preferred way: Use the <a class="el" href="group__codec__registry.html">Codec registry</a> functions to get all supported video encoders. Once you found a codec (i.e. a <a class="el" href="structlqt__codec__info__t.html">lqt_codec_info_t</a> ), call <a class="el" href="group__video__encode.html#gb61ca630dabd16cd5d493b87aca71886">lqt_add_video_track</a> to add the track to the file. You can repeat this procedure to add as many tracks as you like with different formats and/or codecs. You can pass further format parameters with <a class="el" href="group__video__encode.html#g142548c45ec62ff7ede9505752719f81">lqt_set_pixel_aspect</a>.<p>
A very important thing is the colormodel (see <a class="el" href="group__color.html">Color handling</a>): First obtain the colormodel used natively by the codec with <a class="el" href="group__video.html#g7053978f505b771b36fc27892721d032">lqt_get_cmodel</a>. Your application might or might not support all colormodels, which exist in libquicktime. The more colormodels you can handle yourself, the better, since libquicktimes built in colormodel converter is not the best. Thus, it's the best idea to pack all colormodels you can handle yourself into an array, and call <a class="el" href="group__video.html#g128d549ba1e29083ab61f3425ae6350d">lqt_get_best_colormodel</a> to get the best colormodel. After you figured out, which colormodel you use, tell this to libquicktime with <a class="el" href="group__video.html#g6d65bc0c73130f73da12379d8f428cdc">lqt_set_cmodel</a>.<p>
Next you might want to set some compression parameters. This is done by calling <a class="el" href="group__video.html#g80672f881bf783060c467c5e4054e8da">lqt_set_video_parameter</a>. Supported parameters and valid ranges are in the <a class="el" href="structlqt__codec__info__t.html">lqt_codec_info_t</a>.<p>
Actual encoding should happen with <a class="el" href="group__video__encode.html#gd5d2f5fcdbd3237e8cfb4cdc37df91b6">lqt_encode_video</a>. <hr><h2>Function Documentation</h2>
<a class="anchor" name="g5fcd6798e3cb48f68df0b3209c9c5fc8"></a><!-- doxytag: member="quicktime.h::quicktime_set_framerate" ref="g5fcd6798e3cb48f68df0b3209c9c5fc8" args="(quicktime_t *file, double framerate)" -->
<div class="memitem">
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<td class="memname">void quicktime_set_framerate </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>framerate</em></td><td> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
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</div>
<div class="memdoc">
<p>
Set the framerate for encoding.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>framerate</em> </td><td>framerate</td></tr>
</table>
</dl>
Sets the framerate for encoding.<p>
This function is depracated and should not be used in newly written code.
</div>
</div><p>
<a class="anchor" name="gc966ea427e815bd69939c9aed6d5bb9b"></a><!-- doxytag: member="quicktime.h::quicktime_set_video" ref="gc966ea427e815bd69939c9aed6d5bb9b" args="(quicktime_t *file, int tracks, int frame_w, int frame_h, double frame_rate, char *compressor)" -->
<div class="memitem">
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<td class="memname">int quicktime_set_video </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>tracks</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>frame_w</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>frame_h</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>frame_rate</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">char * </td>
<td class="paramname"> <em>compressor</em></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Set up video tracks for encoding.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>tracks</em> </td><td>Number of tracks </td></tr>
<tr><td valign="top"></td><td valign="top"><em>frame_w</em> </td><td>Frame width </td></tr>
<tr><td valign="top"></td><td valign="top"><em>frame_h</em> </td><td>Frame height </td></tr>
<tr><td valign="top"></td><td valign="top"><em>frame_rate</em> </td><td>Frame rate (in frames per second) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>compressor</em> </td><td>Four character code of the compressor</td></tr>
</table>
</dl>
This function is depracated and should not be used in newly written code. It won't allow you to set multiple video streams with different formats, and passing a double framerate causes rounding errors. Use <a class="el" href="group__video__encode.html#gb61ca630dabd16cd5d493b87aca71886">lqt_add_video_track</a> instead.
</div>
</div><p>
<a class="anchor" name="gfa3865194b41bb5272bac9e728792017"></a><!-- doxytag: member="quicktime.h::quicktime_set_jpeg" ref="gfa3865194b41bb5272bac9e728792017" args="(quicktime_t *file, int quality, int use_float)" -->
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<td class="memname">void quicktime_set_jpeg </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
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<td class="paramname"> <em>quality</em>, </td>
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<td class="paramname"> <em>use_float</em></td><td> </td>
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<p>
Set jpeg encoding quality.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>quality</em> </td><td>Quality (0..100) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>use_float</em> </td><td>Use floating point routines</td></tr>
</table>
</dl>
Set the jpeg encoding quality and whether to use floating point routines. This should be called after creating the video track(s).<p>
This function is depracated and should not be used in newly written code. Use <a class="el" href="group__video.html#g80672f881bf783060c467c5e4054e8da">lqt_set_video_parameter</a> instead.
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<a class="anchor" name="g5ed4b88578d7d510b49e1c0595b38b34"></a><!-- doxytag: member="quicktime.h::quicktime_set_parameter" ref="g5ed4b88578d7d510b49e1c0595b38b34" args="(quicktime_t *file, char *key, void *value)" -->
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<td class="memname">void quicktime_set_parameter </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
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<td class="paramtype">char * </td>
<td class="paramname"> <em>key</em>, </td>
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<td class="paramtype">void * </td>
<td class="paramname"> <em>value</em></td><td> </td>
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<p>
Set a codec parameter.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>key</em> </td><td>Short name of the parameter </td></tr>
<tr><td valign="top"></td><td valign="top"><em>value</em> </td><td>Parameter value.</td></tr>
</table>
</dl>
For integer parameters, value must be of the type int*. For string parameters, use char*.<p>
This function sets the same parameter for all video AND audio streams, which is quite idiotic. Use <a class="el" href="group__audio.html#g282a31a22a6819423512b93a0e3595aa">lqt_set_audio_parameter</a> and <a class="el" href="group__video.html#g80672f881bf783060c467c5e4054e8da">lqt_set_video_parameter</a> to set codec parameters on a per stream basis.
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<a class="anchor" name="g052604d9a1276535d4565cf4a87e3a69"></a><!-- doxytag: member="quicktime.h::quicktime_set_depth" ref="g052604d9a1276535d4565cf4a87e3a69" args="(quicktime_t *file, int depth, int track)" -->
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<td class="memname">void quicktime_set_depth </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>depth</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>track</em></td><td> </td>
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<p>
Set the depth of a video track.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>depth</em> </td><td>The depth (bits per pixel) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>track</em> </td><td>index (starting with 0)</td></tr>
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</dl>
This function is deprecated and should never be called. The depth is set by the codecs and there is no reason to change this.
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<a class="anchor" name="gae812955dccd1fe331a8de99de858421"></a><!-- doxytag: member="quicktime.h::quicktime_write_frame" ref="gae812955dccd1fe331a8de99de858421" args="(quicktime_t *file, uint8_t *video_buffer, int64_t bytes, int track)" -->
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<td class="memname">int quicktime_write_frame </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t * </td>
<td class="paramname"> <em>video_buffer</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int64_t </td>
<td class="paramname"> <em>bytes</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>track</em></td><td> </td>
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<td></td>
<td>)</td>
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<p>
Write a compressed video frame.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>video_buffer</em> </td><td>The compressed frame </td></tr>
<tr><td valign="top"></td><td valign="top"><em>bytes</em> </td><td>Bytes of the compressed frame </td></tr>
<tr><td valign="top"></td><td valign="top"><em>track</em> </td><td>index (starting with 0)</td></tr>
</table>
</dl>
If you get compressed video frames (e.g. from a firewire port), use this function to write them into a quicktime container. Before, you must set up the track with <a class="el" href="group__video__encode.html#gb61ca630dabd16cd5d493b87aca71886">lqt_add_video_track</a> or, if no software codec is present, with <a class="el" href="group__video__encode.html#gc966ea427e815bd69939c9aed6d5bb9b">quicktime_set_video</a> .
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<a class="anchor" name="g1819c497a934a07c6dc18abfd91b0a91"></a><!-- doxytag: member="quicktime.h::quicktime_writes_cmodel" ref="g1819c497a934a07c6dc18abfd91b0a91" args="(quicktime_t *file, int colormodel, int track)" -->
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<td class="memname">int quicktime_writes_cmodel </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
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<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>colormodel</em>, </td>
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<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>track</em></td><td> </td>
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<td>)</td>
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<p>
Check if a colormodel is supported for encoding.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>colormodel</em> </td><td>A colormodel (see <a class="el" href="group__color.html">Color handling</a>) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>track</em> </td><td>index (starting with 0) </td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>1 if the colormodel can be used for encoding calls, 0 if it can't.</dd></dl>
To let libquicktime get the best colormodel out of a list of colormodels your application supports, use <a class="el" href="group__video.html#g128d549ba1e29083ab61f3425ae6350d">lqt_get_best_colormodel</a> instead.
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<a class="anchor" name="g8b8200cfc5a091faf3711b19748f5ce0"></a><!-- doxytag: member="quicktime.h::quicktime_encode_video" ref="g8b8200cfc5a091faf3711b19748f5ce0" args="(quicktime_t *file, unsigned char **row_pointers, int track)" -->
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<td class="memname">int quicktime_encode_video </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
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<td></td>
<td class="paramtype">unsigned char ** </td>
<td class="paramname"> <em>row_pointers</em>, </td>
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<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>track</em></td><td> </td>
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<td>)</td>
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<p>
Encode a video frame.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>row_pointers</em> </td><td>Frame buffer (see <a class="el" href="group__video.html#g57ce679a75a23aac4009bfb1cbf3a2fa">lqt_rows_alloc</a> ) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>track</em> </td><td>index (starting with 0)</td></tr>
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</dl>
Encode one video frame. This works only for constant framerate streams. For nonconstant framerates, you'll want to use <a class="el" href="group__video__encode.html#gd5d2f5fcdbd3237e8cfb4cdc37df91b6">lqt_encode_video</a> instead.
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<a class="anchor" name="g142548c45ec62ff7ede9505752719f81"></a><!-- doxytag: member="lqt.h::lqt_set_pixel_aspect" ref="g142548c45ec62ff7ede9505752719f81" args="(quicktime_t *file, int track, int pixel_width, int pixel_height)" -->
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<td class="memname">int lqt_set_pixel_aspect </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>track</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>pixel_width</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>pixel_height</em></td><td> </td>
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<p>
Set the pixel aspect ratio of a video track.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>track</em> </td><td>Track index (starting with 0) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>pixel_width</em> </td><td>Pixel width </td></tr>
<tr><td valign="top"></td><td valign="top"><em>pixel_height</em> </td><td>Pixel height </td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>1 if the call was successful, 0 if there is no such track </dd></dl>
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<a class="anchor" name="g3f1efc3165641e10d2769f9ee4afacef"></a><!-- doxytag: member="lqt.h::lqt_set_interlace_mode" ref="g3f1efc3165641e10d2769f9ee4afacef" args="(quicktime_t *file, int track, lqt_interlace_mode_t mode)" -->
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<td class="memname">int lqt_set_interlace_mode </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
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<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>track</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__video.html#g58950c90660f8709fa724f19afe83c7b">lqt_interlace_mode_t</a> </td>
<td class="paramname"> <em>mode</em></td><td> </td>
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<p>
Set the interlace mode.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>track</em> </td><td>Track index (starting with 0) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>mode</em> </td><td>The interlace mode. </td></tr>
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</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>1 if the call was successful, 0 if there is no such track</dd></dl>
This will in most cases store the correct interlacing information in the file (e.g. in the fiel atom). For tweaking the fiel atom directly, advanced users might look at <a class="el" href="group__atoms.html#ge7e1ca0af8be48c71b9e4841155decff">lqt_set_fiel</a>.
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<a class="anchor" name="ge267dccca78aec8134cb70b132ea00ea"></a><!-- doxytag: member="lqt.h::lqt_set_video" ref="ge267dccca78aec8134cb70b132ea00ea" args="(quicktime_t *file, int tracks, int frame_w, int frame_h, int frame_duration, int timescale, lqt_codec_info_t *codec_info)" -->
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<td class="memname">int lqt_set_video </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>tracks</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>frame_w</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>frame_h</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>frame_duration</em>, </td>
</tr>
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<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>timescale</em>, </td>
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<td class="paramtype"><a class="el" href="structlqt__codec__info__t.html">lqt_codec_info_t</a> * </td>
<td class="paramname"> <em>codec_info</em></td><td> </td>
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<p>
Set up video tracks for encoding.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>tracks</em> </td><td>Number of video tracks </td></tr>
<tr><td valign="top"></td><td valign="top"><em>frame_w</em> </td><td>Image width </td></tr>
<tr><td valign="top"></td><td valign="top"><em>frame_h</em> </td><td>Image height </td></tr>
<tr><td valign="top"></td><td valign="top"><em>frame_duration</em> </td><td>Duration of one frame. This can later be overridden </td></tr>
<tr><td valign="top"></td><td valign="top"><em>timescale</em> </td><td>Timescale of the track </td></tr>
<tr><td valign="top"></td><td valign="top"><em>codec_info</em> </td><td>Codec to use (see <a class="el" href="group__codec__registry.html">Codec registry</a> )</td></tr>
</table>
</dl>
This sets one or more video tracks for encoding. The framerate is passed as a rational number (timescale/frame_duration). E.g. for an NTSC stream, you'll choose timescale = 30000 and frame_duration = 1001. To set up multiple video tracks with different formats and/or codecs, use <a class="el" href="group__video__encode.html#gb61ca630dabd16cd5d493b87aca71886">lqt_add_video_track</a> .
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<a class="anchor" name="gb61ca630dabd16cd5d493b87aca71886"></a><!-- doxytag: member="lqt.h::lqt_add_video_track" ref="gb61ca630dabd16cd5d493b87aca71886" args="(quicktime_t *file, int frame_w, int frame_h, int frame_duration, int timescale, lqt_codec_info_t *codec_info)" -->
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<td class="memname">int lqt_add_video_track </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>frame_w</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>frame_h</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>frame_duration</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>timescale</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structlqt__codec__info__t.html">lqt_codec_info_t</a> * </td>
<td class="paramname"> <em>codec_info</em></td><td> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
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<p>
Add a video track for encoding.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>frame_w</em> </td><td>Image width </td></tr>
<tr><td valign="top"></td><td valign="top"><em>frame_h</em> </td><td>Image height </td></tr>
<tr><td valign="top"></td><td valign="top"><em>frame_duration</em> </td><td>Duration of one frame. This can later be overridden </td></tr>
<tr><td valign="top"></td><td valign="top"><em>timescale</em> </td><td>Timescale of the track </td></tr>
<tr><td valign="top"></td><td valign="top"><em>codec_info</em> </td><td>Codec to use (see <a class="el" href="group__codec__registry.html">Codec registry</a> )</td></tr>
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This sets one or more video tracks for encoding. The framerate is passed as a rational number (timescale/frame_duration). E.g. for an NTSC stream, you'll choose timescale = 30000 and frame_duration = 1001. Call this function to subsequently to add as many tracks as you like.
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<a class="anchor" name="ge4156fc8685ce49d51d08ac78bb0275c"></a><!-- doxytag: member="lqt.h::lqt_set_video_pass" ref="ge4156fc8685ce49d51d08ac78bb0275c" args="(quicktime_t *file, int pass, int total_passes, const char *stats_file, int track)" -->
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<td class="memname">int lqt_set_video_pass </td>
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<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>track</em></td><td> </td>
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Enable multipass encoding.
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>track</em> </td><td>Track index (starting with 0) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>pass</em> </td><td>The number of this pass (starting with 1) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>total_passes</em> </td><td>The total number of passes </td></tr>
<tr><td valign="top"></td><td valign="top"><em>stats_file</em> </td><td>Statistics file</td></tr>
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This is a purely optional function, which enables multipass encoding. Multipass transcoding is done by repeatedly opening a quicktime file, encoding video and and closing it again. The stats_file parameter must always be the same for all passes.<p>
Having more than 2 passes is not always useful. Audio encoding can be skipped for all passes until the last one.
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<a class="anchor" name="gd5d2f5fcdbd3237e8cfb4cdc37df91b6"></a><!-- doxytag: member="lqt.h::lqt_encode_video" ref="gd5d2f5fcdbd3237e8cfb4cdc37df91b6" args="(quicktime_t *file, unsigned char **row_pointers, int track, int64_t time)" -->
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<td class="memname">int lqt_encode_video </td>
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<td class="paramname"> <em>row_pointers</em>, </td>
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<td class="paramname"> <em>track</em>, </td>
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Encode one video frame.
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<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>row_pointers</em> </td><td>Frame (see <a class="el" href="group__video.html#g57ce679a75a23aac4009bfb1cbf3a2fa">lqt_rows_alloc</a>) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>track</em> </td><td>Track index (starting with 0) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>time</em> </td><td>Timestamp of the frame in timescale tics </td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>0 if the frame was encoded, 1 else.</dd></dl>
Encode one video frame. The presentation timestamp is in timescale tics with the timescale you passed to <a class="el" href="group__video__encode.html#gb61ca630dabd16cd5d493b87aca71886">lqt_add_video_track</a> or <a class="el" href="group__video__encode.html#ge267dccca78aec8134cb70b132ea00ea">lqt_set_video</a> . WARNING: AVI files don't support arbitrary timestamps. For AVI files time is ignored, instead it's frame_number * frame_duration,
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