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Reviewed Filter section, added limit parameter to cropdetect, not only SDL 

supports expand.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@6812 b3059339-0415-0410-9bf9-f77b7e298cf2
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diego 2002-07-26 03:24:24 +00:00
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@ -1064,19 +1064,19 @@ screen, although input works with xawtv or similar, then try to use the
<P><A NAME=2.6.1><B>2.6.1. Overview</B></A></P>
<P>Both <B>MPlayer</B> and <B>MEncoder</B> supports using a universal
video filter layer, which comprises of numerous plugins - listed and
<P>Both <B>MPlayer</B> and <B>MEncoder</B> support using a universal
video filter layer, which comprises numerous plugins that are listed and
explained below. These plugins can perform various actions on the image,
such as rescale, crop black borders (useful not only for encoding but for
playing too, since black borders increase bus usage, and cropping these
can boost playing speed on slow boards), expand image (for SVCDs).</P>
such as rescaling, cropping black borders (useful not only for encoding but
for playback, too, since black borders increase bus usage and cropping these
can boost playback speed on slow boards) and expanding the image (for SVCDs).</P>
<P>With this filter layer it's possible to perform fast image format conversion
between the various RGB and YUV when necessary. This enables for example
playing RGB data on <CODE>xv</CODE> and <CODE>xmga</CODE> outputs, amongst
others. (see the <A HREF="#2.6.11">Scale</A> filter)</P>
between the various RGB and YUV formats when necessary. This enables for
example playing RGB data on <CODE>xv</CODE> and <CODE>xmga</CODE> video output
drivers among other things (see the <A HREF="#2.6.11">Scale</A> filter).</P>
<P>The layer also does <B>Direct Rendering</B> between the plugins, to
<P>The filter layer also does <B>Direct Rendering</B> between the plugins, to
maximize the speed.
<P>Note that the postprocessing code is now also a part of the layer. It
@ -1089,24 +1089,25 @@ screen, although input works with xawtv or similar, then try to use the
<P>This sets up a filter pipeline (you can use any number of filters). Their
parameters are optional and if omitted, some of them are set to default
values, like <CODE>x</CODE> and <CODE>y</CODE> are both set to the center of
the screen, and <CODE>width</CODE> and <CODE>height</CODE>> will be set to
the movie's width and height.</P>
values, e.g. <CODE>x</CODE> and <CODE>y</CODE> are both set to the center of
the screen and <CODE>width</CODE> and <CODE>height</CODE>> will be set to
the width and height of the movie.</P>
<P>Filters are queued starting from libvo, so <CODE>filter1</CODE> will be the
last called filter (after that libvo comes, or when using <B>MEncoder</B>,
last filter called (after that comes libvo, or when using <B>MEncoder</B>,
encoding).</P>
<P>You can get the list of available video filters with the<BR>
"<CODE>mplayer -vop help</CODE>" command line.</P>
<P>You can get the list of available video filters with the command</P>
<P>&nbsp;&nbsp;<CODE>mplayer -vop help</CODE></P>
<P><A NAME=2.6.3><B>2.6.3. Crop</B></A></P>
<P><B><U>Description</U></B>:</P>
<P>Crops the given part of the image, and discards the rest. Useful for
removing black bands of widescreen movies.</P>
<P>Crops the given part of the image and discards the rest. Useful for removing
black bands from widescreen movies.</P>
<P><B><U>Usage</U></B>:</P>
@ -1117,12 +1118,10 @@ screen, although input works with xawtv or similar, then try to use the
<P><B><U>Description</U></B>:</P>
<P>Expands (NOT scales) movie resolution to the given value, and places the
unscaled original to <CODE>x</CODE> <CODE>y</CODE>. For movies not containing
black bands, this can be used to add them. This is good when creating SVCDs,
or using with the
<A HREF="video.html#2.3.1.4">SDL video output</A> which can place
subtitles in these bands.</P>
<P>Expands (<B>not</B> scales) movie resolution to the given value and places
the unscaled original at coordinates <CODE>x</CODE> <CODE>y</CODE>. For movies
not containing black bands, this can be used to add them. This is good when
creating SVCDs or for placing subtitles or the OSD in these bands.</P>
<P><B><U>Usage</U></B>:</P>
@ -1147,8 +1146,8 @@ screen, although input works with xawtv or similar, then try to use the
<P><B><U>Description</U></B>:</P>
<P>Simply flips image. Useful for some old codecs which can output only
flipped image (these are autodetected).</P>
<P>Simply flips the image upside down. Useful for some old codecs which can only
output a flipped image (these are autodetected).</P>
<P><B><U>Usage</U></B>:</P>
@ -1159,9 +1158,9 @@ screen, although input works with xawtv or similar, then try to use the
<P><B><U>Description</U></B>:</P>
<P>This filter is NOT image format converter. It just forces the next filter
(or libvo) which image format to use. Useful for cards with slow YV12, like
tdfx and Savage4. For real conversion, use the <CODE>Scale</CODE> filter.</P>
<P>This filter is <B>not</B> an image format converter. It just forces the next
filter (or libvo) to use the given format. Useful for cards with slow YV12,
like tdfx and Savage4. For real conversion, use the scale filter.</P>
<P><B><U>Usage</U></B>:</P>
@ -1188,7 +1187,7 @@ screen, although input works with xawtv or similar, then try to use the
<P>Performs RGB 24/32 <-> BGR 24/32 colorspace conversion (default behavior)
or RGB 24/32 <-> RGB 24/32 conversion with R<->B swapping (with the 'swap'
option)</P>
option).</P>
<P><B><U>Usage</U></B>:</P>
@ -1199,8 +1198,8 @@ screen, although input works with xawtv or similar, then try to use the
<P><B><U>Description</U></B>:</P>
<P>Rotates (flips) image. Parameter 'x' (values: 0-3) controls horizontal and
vertical mirroring.</P>
<P>Rotates (flips) the image. The parameter <CODE>x</CODE> (values: 0-3)
controls horizontal and vertical mirroring.</P>
<P><B><U>Usage</U></B>:</P>
@ -1215,7 +1214,7 @@ screen, although input works with xawtv or similar, then try to use the
quality of the scaler with the <CODE>-sws</CODE> option, see the man page.
Nice quality implies speed loss.</P>
<P><B>NOTE</B>: calling this filter with no options means <B>colorspace
<P><B>Note:</B> Calling this filter with no options means <B>colorspace
conversion</B>! This is useful for codecs which can't output in the needed
format for the specified video output device. These are hopefully
autodetected and scale filter is called to convert. In other cases, you
@ -1263,12 +1262,15 @@ screen, although input works with xawtv or similar, then try to use the
<P><B><U>Description</U></B>:</P>
<P>Calculates needed cropping parameters. It will print the recommended -vop
option to stdout.</P>
<P>Calculates necessary cropping parameters. It will print the recommended
<CODE>-vop crop</CODE> parameters to stdout. You can adjust the threshold of
what is detected as border and what as picture with the <CODE>limit</CODE>
parameter. <CODE>limit</CODE> is a number from 0 to 255 that defaults to 24.
At 0 it detects everything as picture, at 255 everything as border.</P>
<P><B><U>Usage</U></B>:</P>
<P><CODE>&nbsp;&nbsp;-vop cropdetect</CODE></P>
<P><CODE>&nbsp;&nbsp;-vop cropdetect[=limit]</CODE></P>
<P><B><A NAME=3>3. Usage</A></B></P>