[MPlayer-dev-eng] [PATCH] zr, man page + manual update
rsnel at cube.dyndns.org
rsnel at cube.dyndns.org
Fri Aug 30 21:05:40 CEST 2002
Hello Diego,
Here is the updated version of my manual update. The option descriptions
are moved to the man page, some typos have been corrected (and introduced)
and I added some text about the performance of the driver on my own system
(AMD K6-2 350MHz).
Greetings,
Rik.
--
Nothing is ever a total loss; it can always serve as a bad example.
-------------- next part --------------
Index: mplayer.1
===================================================================
RCS file: /cvsroot/mplayer/main/DOCS/mplayer.1,v
retrieving revision 1.218
diff -u -r1.218 mplayer.1
--- mplayer.1 30 Aug 2002 11:37:41 -0000 1.218
+++ mplayer.1 30 Aug 2002 19:15:10 -0000
@@ -1077,9 +1077,60 @@
9 max compression
.TP
.B \-zr* (\-vo zr only)
-You can get a list and an explanation of available options executing
-.I mplayer \-zrhelp
+All the options that start with \-zr are specific to the zr video output
+driver.
+.TP
+.B \-zrxdoff <x display offset>, \-zrydoff <y display offset>
+If the movie is smaller than the tv screen, these options control the position
+of the movie relative to the upper left corner of the screen, the movie
+is centered by default.
+
+.TP
+.B \-zrvdec 1,2,4 , \-zrhdec 1,2,4
+Vertical/horizontal decimation: ask the driver to send only every 2nd or 4th
+line/pixel of the input image to the MJPEG card and use the scaler of the
+MJPEG card to strech the image to its original size.
+
+.TP
+.B \-zrfd
+Force decimation: decimation, as specified by -zrhdec and -zrvdec, only happens
+if the hardware scaler can stretch the image to its original size, use this
+option to force decimation.
+
+.TP
+.B \-zrbw
+Display in black and white (for optimal performance, this option can be
+combined with the 'decode only in black and white' option to codecs
+belonging the the ffmpeg family).
+
+.TP
+.B \-zrquality <1\-20>
+A number from 1 to 20 representing the jpeg encoding quality, 1 gives the best
+quality and 20 gives very bad quality.
+
+.TP
+.B \-zrdev <device>
+Specify the device special file that belongs to your MJPEG card, by default
+this driver takes the first v4l device it can find.
+
+.TP
+.B \-zrnorm PAL|NTSC
+Specify norm PAL/NTSC, the default is 'no change'.
+
+.TP
+.B \-zrhelp
+Display a list of all -zr* options, their default values and an example of
+cinerama mode.
+
+.TP
+.B \-zrcrop <width>x<height>+<x offset>+<y offset>
+Select a part of the input image for display, multiple occurances of this
+option switch on cinerama mode, in cinerama mode the movie is distributed
+over more than one tv (or beamer) to create a larger screen. Options appearing
+after the n-th -zrcrop apply to the n-th MJPEG card, each card should at least
+have a -zrdev in addition to the -zrcrop. For examples, see the output of
+-zrhelp and the manual.
.SH "PLAYER OPTIONS (MPLAYER ONLY)"
.TP
Index: video.html
===================================================================
RCS file: /cvsroot/mplayer/main/DOCS/video.html,v
retrieving revision 1.96
diff -u -r1.96 video.html
--- video.html 29 Aug 2002 13:04:01 -0000 1.96
+++ video.html 30 Aug 2002 19:15:19 -0000
@@ -993,34 +993,85 @@
<P>This is a display-driver (<CODE>-vo zr</CODE>) for a number of MJPEG
capture/playback cards (tested for DC10+ and Buz, and it should work for the
- LML33, the DC10). The driver works by encoding the frame to jpeg and then
- sending it to the card. For the jpeg encoding <B>libavcodec</B> is
- used, and required.</P>
+ LML33 and the original DC10). The driver works by encoding the frame to jpeg
+ and then sending it to the card. For the jpeg encoding <B>libavcodec</B> is
+ used, and required. With the special <I>cinerama</I> mode, you can watch
+ movies in true wide screen provided that you have two beamers and two
+ MJPEG cards. Depending on resolution and quality settings, this driver
+ may require a lot of CPU power, remember to specify <CODE>-framedrop</CODE>
+ if your machine is too slow. Note: my AMD K6-2 350MHz is (with <CODE>
+ -framedrop</CODE>) quite adequate for watching VCD sized material and
+ downscaled movies.
<P>This driver talks to the kernel driver available at
<A HREF="http://mjpeg.sourceforge.net">http://mjpeg.sourceforge.net</A>, so
- you must get it working first. Then recompile <B>MPlayer</B> with
- <CODE>--enable-zr</CODE>.</P>
+ you must get it working first. The presence of an MJPEG card is autodetected
+ by the configure script, if autodetection fails, force detection with
-Some remarks:
-<UL>
- <LI>don't start or stop XawTV on the playback device during playback,
- it will crash your computer. It is, however, fine to <B>FIRST</B> start
- XawTV, <B>THEN</B> start <B>MPlayer</B>, wait for <B>MPlayer</B> to finish
- and <B>THEN</B> stop XawTV.</LI>
- <LI>this driver adds <CODE>-zr*</CODE> command line options. The explanation
- of these options can be viewed with <CODE>-zrhelp</CODE>. It is possible to
- crop the input frame (cut borders to make it fit or to enhance performance)
- and to do other things.</LI>
- <LI>the driver takes data in YV12 and YUY2 format, this means that some
- codecs won't work. Some old VfW (Video for Windows) codecs, for example,
- are incompatible with this driver. The error message that you will see is:
- <CODE>Sorry, selected video_out device is incompatible with this codec.
- </CODE></LI>
- <LI>OSD is currently not supported, so you won't see
- subtitles.</LI>
-</UL>
+<PRE>
+ ./configure --enable-zr
+</PRE>
+<P>The output can be controlled by several options, a long description of the
+ options can be found in the man page, a short list of options can be
+ viewed by running
+
+<PRE>
+ mplayer -zrhelp
+</PRE>
+
+<P>Things like scaling and the OSD (on screen display) are not handled by
+ this driver but can be done using the video filters. For example,
+ suppose that you have a movie with a resolution of <CODE>512x272</CODE> and
+ you want to view it fullscreen on your DC10+. There are three main
+ possibilities, you may scale the movie to a width of <CODE>768</CODE>,
+ <CODE>384</CODE> or <CODE>192</CODE>. For performance and quality reasons,
+ I would choose to scale the movie to <CODE>384x204</CODE> using the fast
+ bilinear software scaler. The commandline is
+
+<PRE>
+ mplayer -vo zr -sws 0 -vop scale=384:204 movie.avi
+</PRE>
+
+<P>Cropping can be done by the <CODE>crop</CODE> filter and by
+ this driver itself. Suppose that a movie is too wide for display on your
+ Buz and that you want to use <CODE>-zrcrop</CODE> to make the movie less
+ wide, the you would issue the following command
+
+<PRE>
+ mplayer -vo zr -zrcrop 720x320+80+0 benhur.avi
+</PRE>
+
+ if you want to use the <CODE>crop</CODE> filter, you would do
+
+<PRE>
+ mplayer -vo zr -vop crop=720:320:80:0 benhur.avi
+</PRE>
+
+<P>Extra occurances of <CODE>-zrcrop</CODE> invoke <I>cinerama</I> mode, i.e.
+ you can distribute the movie over several tv's or beamers to create a larger
+ screen. Suppose you have two beamers. The left one is connected to your Buz
+ at <CODE>/dev/video1</CODE> and the right one is connected to your DC10+ at
+ <CODE>/dev/video0</CODE>. The movie has a resolution of <CODE>704x288</CODE>.
+ Suppose also that you want the right beamer in black and white and that
+ the right beamer should have jpeg frames at quality <CODE>10</CODE>,
+ then you would issue the following command
+
+<PRE>
+ mplayer -vo zr -zrdev /dev/video0 -zrcrop 352x288+352+0 -zrxdoff 0 -zrbw \
+ -zrcrop 352x288+0+0 -zrdev /dev/video1 -zrquality 10 movie.avi
+</PRE>
+
+<P>You see that the options appearing before the second <CODE>-zrcrop</CODE>
+ only apply to the DC10+ and that the options after the second
+ <CODE>-zrcrop</CODE> apply to the Buz. The maximum number of MJPEG cards
+ participating in <I>cinerama</I> is four, so you can buid a <CODE>2x2</CODE>
+ vidiwall.</P>
+
+<P>Finally an important remark: don't start or stop XawTV on the playback
+ device during playback, it will crash your computer. It is, however, fine to
+ <B>FIRST</B> start XawTV, <B>THEN</B> start <B>MPlayer</B>, wait for
+ <B>MPlayer</B> to finish and <B>THEN</B> stop XawTV.</P>
<H4><A NAME="dvb">2.3.1.16 DVB</A></H4>
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