<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html401/loose.dtd">
<html>
-<!-- Created on May 18, 2011 by texi2html 1.82
+<!-- Created on June 10, 2011 by texi2html 1.82
texi2html was written by:
Lionel Cons <Lionel.Cons@cern.ch> (original author)
Karl Berry <karl@freefriends.org>
<li><a name="toc-pad" href="#pad">8.20 pad</a></li>
<li><a name="toc-pixdesctest" href="#pixdesctest">8.21 pixdesctest</a></li>
<li><a name="toc-scale" href="#scale">8.22 scale</a></li>
- <li><a name="toc-setdar-1" href="#setdar-1">8.23 setdar</a></li>
- <li><a name="toc-setpts" href="#setpts">8.24 setpts</a></li>
- <li><a name="toc-setsar-1" href="#setsar-1">8.25 setsar</a></li>
- <li><a name="toc-settb" href="#settb">8.26 settb</a></li>
- <li><a name="toc-showinfo" href="#showinfo">8.27 showinfo</a></li>
- <li><a name="toc-slicify" href="#slicify">8.28 slicify</a></li>
- <li><a name="toc-transpose" href="#transpose">8.29 transpose</a></li>
- <li><a name="toc-unsharp" href="#unsharp">8.30 unsharp</a></li>
- <li><a name="toc-vflip" href="#vflip">8.31 vflip</a></li>
- <li><a name="toc-yadif" href="#yadif">8.32 yadif</a></li>
+ <li><a name="toc-select" href="#select">8.23 select</a></li>
+ <li><a name="toc-setdar-1" href="#setdar-1">8.24 setdar</a></li>
+ <li><a name="toc-setpts" href="#setpts">8.25 setpts</a></li>
+ <li><a name="toc-setsar-1" href="#setsar-1">8.26 setsar</a></li>
+ <li><a name="toc-settb" href="#settb">8.27 settb</a></li>
+ <li><a name="toc-showinfo" href="#showinfo">8.28 showinfo</a></li>
+ <li><a name="toc-slicify" href="#slicify">8.29 slicify</a></li>
+ <li><a name="toc-split" href="#split">8.30 split</a></li>
+ <li><a name="toc-transpose" href="#transpose">8.31 transpose</a></li>
+ <li><a name="toc-unsharp" href="#unsharp">8.32 unsharp</a></li>
+ <li><a name="toc-vflip" href="#vflip">8.33 vflip</a></li>
+ <li><a name="toc-yadif" href="#yadif">8.34 yadif</a></li>
</ul></li>
<li><a name="toc-Video-Sources" href="#Video-Sources">9. Video Sources</a>
<ul class="toc">
<dt> <var>pullup</var></dt>
<dt> <var>qp</var></dt>
<dt> <var>rectangle</var></dt>
-<dt> <var>remove_logo</var></dt>
+<dt> <var>remove-logo</var></dt>
<dt> <var>rgbtest</var></dt>
<dt> <var>rotate</var></dt>
<dt> <var>sab</var></dt>
scale='min(500\, iw*3/2):-1'
</pre></td></tr></table>
+<a name="select"></a>
+<h2 class="section"><a href="libavfilter.html#toc-select">8.23 select</a></h2>
+<p>Select frames to pass in output.
+</p>
+<p>It accepts in input an expression, which is evaluated for each input
+frame. If the expression is evaluated to a non-zero value, the frame
+is selected and passed to the output, otherwise it is discarded.
+</p>
+<p>The expression can contain the following constants:
+</p>
+<dl compact="compact">
+<dt> ‘<samp>PI</samp>’</dt>
+<dd><p>Greek PI
+</p>
+</dd>
+<dt> ‘<samp>PHI</samp>’</dt>
+<dd><p>golden ratio
+</p>
+</dd>
+<dt> ‘<samp>E</samp>’</dt>
+<dd><p>Euler number
+</p>
+</dd>
+<dt> ‘<samp>n</samp>’</dt>
+<dd><p>the sequential number of the filtered frame, starting from 0
+</p>
+</dd>
+<dt> ‘<samp>selected_n</samp>’</dt>
+<dd><p>the sequential number of the selected frame, starting from 0
+</p>
+</dd>
+<dt> ‘<samp>prev_selected_n</samp>’</dt>
+<dd><p>the sequential number of the last selected frame, NAN if undefined
+</p>
+</dd>
+<dt> ‘<samp>TB</samp>’</dt>
+<dd><p>timebase of the input timestamps
+</p>
+</dd>
+<dt> ‘<samp>pts</samp>’</dt>
+<dd><p>the PTS (Presentation TimeStamp) of the filtered video frame,
+expressed in <var>TB</var> units, NAN if undefined
+</p>
+</dd>
+<dt> ‘<samp>t</samp>’</dt>
+<dd><p>the PTS (Presentation TimeStamp) of the filtered video frame,
+expressed in seconds, NAN if undefined
+</p>
+</dd>
+<dt> ‘<samp>prev_pts</samp>’</dt>
+<dd><p>the PTS of the previously filtered video frame, NAN if undefined
+</p>
+</dd>
+<dt> ‘<samp>prev_selected_pts</samp>’</dt>
+<dd><p>the PTS of the last previously filtered video frame, NAN if undefined
+</p>
+</dd>
+<dt> ‘<samp>prev_selected_t</samp>’</dt>
+<dd><p>the PTS of the last previously selected video frame, NAN if undefined
+</p>
+</dd>
+<dt> ‘<samp>start_pts</samp>’</dt>
+<dd><p>the PTS of the first video frame in the video, NAN if undefined
+</p>
+</dd>
+<dt> ‘<samp>start_t</samp>’</dt>
+<dd><p>the time of the first video frame in the video, NAN if undefined
+</p>
+</dd>
+<dt> ‘<samp>pict_type</samp>’</dt>
+<dd><p>the picture type of the filtered frame, can assume one of the following
+values:
+</p><dl compact="compact">
+<dt> ‘<samp>PICT_TYPE_I</samp>’</dt>
+<dt> ‘<samp>PICT_TYPE_P</samp>’</dt>
+<dt> ‘<samp>PICT_TYPE_B</samp>’</dt>
+<dt> ‘<samp>PICT_TYPE_S</samp>’</dt>
+<dt> ‘<samp>PICT_TYPE_SI</samp>’</dt>
+<dt> ‘<samp>PICT_TYPE_SP</samp>’</dt>
+<dt> ‘<samp>PICT_TYPE_BI</samp>’</dt>
+</dl>
+
+</dd>
+<dt> ‘<samp>interlace_type</samp>’</dt>
+<dd><p>the frame interlace type, can assume one of the following values:
+</p><dl compact="compact">
+<dt> ‘<samp>INTERLACE_TYPE_P</samp>’</dt>
+<dd><p>the frame is progressive (not interlaced)
+</p></dd>
+<dt> ‘<samp>INTERLACE_TYPE_T</samp>’</dt>
+<dd><p>the frame is top-field-first
+</p></dd>
+<dt> ‘<samp>INTERLACE_TYPE_B</samp>’</dt>
+<dd><p>the frame is bottom-field-first
+</p></dd>
+</dl>
+
+</dd>
+<dt> ‘<samp>key</samp>’</dt>
+<dd><p>1 if the filtered frame is a key-frame, 0 otherwise
+</p>
+</dd>
+<dt> ‘<samp>pos</samp>’</dt>
+<dd><p>the position in the file of the filtered frame, -1 if the information
+is not available (e.g. for synthetic video)
+</p></dd>
+</dl>
+
+<p>The default value of the select expression is "1".
+</p>
+<p>Some examples follow:
+</p>
+<table><tr><td> </td><td><pre class="example"># select all frames in input
+select
+
+# the above is the same as:
+select=1
+
+# skip all frames:
+select=0
+
+# select only I-frames
+select='eq(pict_type\,PICT_TYPE_I)'
+
+# select one frame every 100
+select='not(mod(n\,100))'
+
+# select only frames contained in the 10-20 time interval
+select='gte(t\,10)*lte(t\,20)'
+
+# select only I frames contained in the 10-20 time interval
+select='gte(t\,10)*lte(t\,20)*eq(pict_type\,PICT_TYPE_I)'
+
+# select frames with a minimum distance of 10 seconds
+select='isnan(prev_selected_t)+gte(t-prev_selected_t\,10)'
+</pre></td></tr></table>
+
<p><a name="setdar"></a>
</p><a name="setdar-1"></a>
-<h2 class="section"><a href="libavfilter.html#toc-setdar-1">8.23 setdar</a></h2>
+<h2 class="section"><a href="libavfilter.html#toc-setdar-1">8.24 setdar</a></h2>
<p>Set the Display Aspect Ratio for the filter output video.
</p>
<p>See also the "setsar" filter documentation (see <a href="#setsar">setsar</a>).
</p>
<a name="setpts"></a>
-<h2 class="section"><a href="libavfilter.html#toc-setpts">8.24 setpts</a></h2>
+<h2 class="section"><a href="libavfilter.html#toc-setpts">8.25 setpts</a></h2>
<p>Change the PTS (presentation timestamp) of the input video frames.
</p>
<p><a name="setsar"></a>
</p><a name="setsar-1"></a>
-<h2 class="section"><a href="libavfilter.html#toc-setsar-1">8.25 setsar</a></h2>
+<h2 class="section"><a href="libavfilter.html#toc-setsar-1">8.26 setsar</a></h2>
<p>Set the Sample (aka Pixel) Aspect Ratio for the filter output video.
</p>
</pre></td></tr></table>
<a name="settb"></a>
-<h2 class="section"><a href="libavfilter.html#toc-settb">8.26 settb</a></h2>
+<h2 class="section"><a href="libavfilter.html#toc-settb">8.27 settb</a></h2>
<p>Set the timebase to use for the output frames timestamps.
It is mainly useful for testing timebase configuration.
</pre></td></tr></table>
<a name="showinfo"></a>
-<h2 class="section"><a href="libavfilter.html#toc-showinfo">8.27 showinfo</a></h2>
+<h2 class="section"><a href="libavfilter.html#toc-showinfo">8.28 showinfo</a></h2>
<p>Show a line containing various information for each input video frame.
The input video is not modified.
</dl>
<a name="slicify"></a>
-<h2 class="section"><a href="libavfilter.html#toc-slicify">8.28 slicify</a></h2>
+<h2 class="section"><a href="libavfilter.html#toc-slicify">8.29 slicify</a></h2>
<p>Pass the images of input video on to next video filter as multiple
slices.
<p>Adding this in the beginning of filter chains should make filtering
faster due to better use of the memory cache.
</p>
+<a name="split"></a>
+<h2 class="section"><a href="libavfilter.html#toc-split">8.30 split</a></h2>
+
+<p>Pass on the input video to two outputs. Both outputs are identical to
+the input video.
+</p>
+<p>For example:
+</p><table><tr><td> </td><td><pre class="example">[in] split [splitout1][splitout2];
+[splitout1] crop=100:100:0:0 [cropout];
+[splitout2] pad=200:200:100:100 [padout];
+</pre></td></tr></table>
+
+<p>will create two separate outputs from the same input, one cropped and
+one padded.
+</p>
<a name="transpose"></a>
-<h2 class="section"><a href="libavfilter.html#toc-transpose">8.29 transpose</a></h2>
+<h2 class="section"><a href="libavfilter.html#toc-transpose">8.31 transpose</a></h2>
<p>Transpose rows with columns in the input video and optionally flip it.
</p>
</dl>
<a name="unsharp"></a>
-<h2 class="section"><a href="libavfilter.html#toc-unsharp">8.30 unsharp</a></h2>
+<h2 class="section"><a href="libavfilter.html#toc-unsharp">8.32 unsharp</a></h2>
<p>Sharpen or blur the input video.
</p>
</pre></td></tr></table>
<a name="vflip"></a>
-<h2 class="section"><a href="libavfilter.html#toc-vflip">8.31 vflip</a></h2>
+<h2 class="section"><a href="libavfilter.html#toc-vflip">8.33 vflip</a></h2>
<p>Flip the input video vertically.
</p>
</pre></td></tr></table>
<a name="yadif"></a>
-<h2 class="section"><a href="libavfilter.html#toc-yadif">8.32 yadif</a></h2>
+<h2 class="section"><a href="libavfilter.html#toc-yadif">8.34 yadif</a></h2>
<p>Deinterlace the input video ("yadif" means "yet another deinterlacing
filter").
through the interface defined in ‘<tt>libavfilter/vsrc_buffer.h</tt>’.
</p>
<p>It accepts the following parameters:
-<var>width</var>:<var>height</var>:<var>pix_fmt_string</var>:<var>timebase_num</var>:<var>timebase_den</var>:<var>sample_aspect_ratio_num</var>:<var>sample_aspect_ratio.den</var>
+<var>width</var>:<var>height</var>:<var>pix_fmt_string</var>:<var>timebase_num</var>:<var>timebase_den</var>:<var>sample_aspect_ratio_num</var>:<var>sample_aspect_ratio.den</var>:<var>scale_params</var>
</p>
-<p>All the parameters need to be explicitely defined.
+<p>All the parameters but <var>scale_params</var> need to be explicitely
+defined.
</p>
<p>Follows the list of the accepted parameters.
</p>
<dt> ‘<samp>sample_aspect_ratio.num, sample_aspect_ratio.den</samp>’</dt>
<dd><p>Specify numerator and denominator of the sample aspect ratio assumed
by the video frames.
+</p>
+</dd>
+<dt> ‘<samp>scale_params</samp>’</dt>
+<dd><p>Specify the optional parameters to be used for the scale filter which
+is automatically inserted when an input change is detected in the
+input size or format.
</p></dd>
</dl>
Since the pixel format with name "yuv410p" corresponds to the number 6
(check the enum PixelFormat definition in ‘<tt>libavutil/pixfmt.h</tt>’),
this example corresponds to:
-</p><table><tr><td> </td><td><pre class="example">buffer=320:240:6:1:24
+</p><table><tr><td> </td><td><pre class="example">buffer=320:240:6:1:24:1:1
</pre></td></tr></table>
<a name="color"></a>
<hr size="1">
<p>
<font size="-1">
- This document was generated by <em>Kyle Schwarz</em> on <em>
May 18, 2011</em> using <a href="http://www.nongnu.org/texi2html/"><em>texi2html 1.82</em></a>.
+ This document was generated by <em>Kyle Schwarz</em> on <em>
June 10, 2011</em> using <a href="http://www.nongnu.org/texi2html/"><em>texi2html 1.82</em></a>.
</font>
<br>
projects / casparcg / blobdiff