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321 lines
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321 lines
14 KiB
HTML
<HTML>
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<BODY BGCOLOR=white>
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<FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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<P><B><A NAME=2.4>2.4. Encoding with MEncoder</A></B></P>
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<P><B><A NAME=2.4.1>2.4.1. Overview</B></P>
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<P><B>MEncoder</B> (<B>MPlayer</B>'s Movie Encoder) is a simple movie encoder,
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designed to encode MPlayer-playable movies
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(<B>AVI/DVD/VCD/VOB/MPG/MOV/VIV/FLI/RM/NUV/NET</B>) to other MPlayer-playable formats (see
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below). Currently it's in beta stage, and encodes only to <B>DivX4</B> (1 or 2
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passes) video, <B>PCM</B>/<B>MP3</B>/<B>VBRMP3</B> audio. Also has stream
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copying abilities. In the future, there will be cropping, resizing filters, and
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other interesting stuff.</P>
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<P><B><A NAME=2.4.2>2.4.2. Compiling</B></P>
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<P>
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<UL>
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<LI><B>OPTIONAL</B> - read <B>MPlayer</B>'s compilation instructions, it contains info about
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how to install <I>libdvdread</I> for <B>DVD</B> support, etc.</LI>
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<LI><B>OPTIONAL</B> - download the newest <B>DivX4linux</B> libs
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from <A HREF="http://avifile.sourceforge.net/download.htm">avifile.sourceforge.net</A>,
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and have them PROPERLY installed. This is needed for DivX4 (1/2 pass)
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encoding. And since this is mandatory (now), MEncoder is Linux-only.</LI>
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<LI><B>OPTIONAL</B> - for libavcodec support, install libavcodec as
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described in the <A HREF="codecs.html#2.2.1.2">libavcodec section</A>.</LI>
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<LI><B>OPTIONAL</B> - download and compile <B>libmp3lame</B> (from lame 3.89beta or lame CVS).<BR>
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<B>WARNING : DO NOT COMPILE LAME WITH <U>GCC 2.96</U> ! It won't
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work properly !</B><BR>
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This
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is needed for CBR/VBR MP3 audio encoding ability. Note that a single
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<CODE>lame</CODE> binary isn't sufficient. BTW: the less optimization
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you use for lame, the better the quality will be. You can test
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quality by running <CODE>make test</CODE> after lame's compiling process
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is over. The resulting number should be less than <B>30</B>. Don't
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panic if it's <B>400</B> or so, you shouldn't heard any audible
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quality decrease. Oh, and if your compiler doesn't even run <CODE>make test</CODE> ...
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Well, delete that <B>GCC 2.96</B>.</LI>
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<LI>use <CODE>./configure</CODE> with optional parameters as usual
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(use <CODE>--enable-tv</CODE> to include V4L tuner grabbing code), and
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type : <CODE>make mencoder</CODE> , then <CODE>make install</CODE>.</LI>
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</UL>
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</P>
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<P>You are ready. As you probably know, other encoding tools need the
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<I>avifile</I> library installed. <B>MEncoder</B> doesn't need it at all.</P>
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<P><B><A NAME=2.4.3>2.4.3. MEncoder features</B></P>
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<P>
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<UL>
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<LI>encoding from the wide range of fileformats and decoders of <B>MPlayer</B></LI>
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<LI>encoding from <B>V4L compatible TV tuners</B></LI>
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<LI>encoding/multiplexing to interleaved AVI files with proper index</LI>
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<LI>1 or 2 pass <B>DivX4</B> video</LI>
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<LI><B>VBR</B> MP3 audio - <B>IMPORTANT NOTE</B> : VBR MP3 audio doesn't
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always play nicely on windows players! If you intend to encode AVIs
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mainly for windows, encode with CBR!</LI>
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<LI>PCM audio</LI>
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<LI>stream copying (CBR audio only)</LI>
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<LI>input A/V synchronizing (PTS-based, can be disabled with -mc 0 option)</LI>
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<LI>FPS correction with <CODE>-ofps</CODE> option (useful when encoding
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29.97fps VOB to 24fps AVI)</LI>
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<LI>movie rescaling</LI>
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</UL>
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</P>
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<P><B><I>Planned features</I></B> :
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<UL>
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<LI>using audio from separate file (AC3, MP3, OGG)</LI>
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<LI>VBR audio stream copy</LI>
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<LI>even wider variety of available en/decoding formats/codecs
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(creating VOB files with DivX4/Indeo5/VIVO streams :)</LI>
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</UL>
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</P>
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<P><B><A NAME=2.4.3.1>2.4.3.1. Encoding 2-pass DivX4</B></P>
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<P>The name comes from the fact that this method encodes the file <I>twice</I>.
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The first encoding (dubbed <I>pass</I>) creates some temporary files (*.log) with a
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size of few megabytes, do not delete them yet (you can delete the AVI). In the second pass, the
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2-pass output file is created, using the bitrate data from the temporary files. The resulting
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file will have much better image quality. If this is the first time you heard
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about this, you should consult some guides available on the Net.</P>
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<P>This example shows how to encode a DVD to a 2-pass DivX4 AVI. Just two
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commands are needed :<BR>
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<CODE> mencoder -dvd 2 -ovc divx4 -oac mp3lame -divx4opts br=1100
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-o movie.avi -pass 1<BR>
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mencoder -dvd 2 -ovc divx4 -oac mp3lame -divx4opts br=1100 -o movie.avi -pass 2</CODE></P>
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<P><B><A NAME=2.4.3.2>2.4.3.2. Rescaling movies</B></P>
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<P>Often the need to resize movie images' size emerges. Its reasons can be many,
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examples are decreasing output file size, encoding SVCDs to DivX. Ripped DVDs
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are mostly rescaled, for example a 4:3 DVD should be 640x480, especially
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when you want it to fit to 1 CD, and have good quality at the same time.
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SVCDs have 480x480 size, and their header contains the aspect ratio the
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player should use (Ex.: 480x480 + 4:3 = 640x480). However when encoding to
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AVI (DivX) files, you have be aware that AVI headers don't store this
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value. Thus, the only solution is rescaling.</P>
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<P><B>MEncoder</B> can scale input images if they come in YV12 format (for example:
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ffdivx, odivx drivers, or mpeg1/2). The output size is specified with the
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<CODE>-x</CODE>, and <CODE>-y</CODE> options. Furthermore, there are 3
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rescaling filters in <B>MEncoder</B>, <I>0
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: fast bilinear</I>, <I>1 : bilinear</I>, <I>2 : bicubic</I> (best quality).
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They can be specified with the <CODE>-sws</CODE> option. If not specified,
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<B>MEncoder</B> will use 0 : fast bilinear.</P>
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<P>Rescaling is very simple :<BR>
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<CODE> mencoder sample-svcd.mpg -divx4opts br=1300 -x 640 -y 480 -sws 2 -o output.avi</CODE></P>
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<P><B><A NAME=2.4.3.3>2.4.3.3. Stream copying</B></P>
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<P><B>MEncoder</B> can handle input streams in two ways : <B>encode</B> or
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<B>copy</B> them. This section is about <B>copying</B>.</P>
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<P>
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<UL>
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<LI><B>Video stream</B> (option <CODE>-ovc copy</CODE>) : nice stuff can be done :)<BR>
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Like, putting (not converting!) FLI or VIVO or MPEG1 video into an AVI file !
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Of course only <B>MPlayer</B> can play such files :) And it probably has no
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real life value at all. Rationally : video stream copying can be useful for
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example when only the audio stream has to be encoded (like, uncompressed PCM
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to MP3).</LI>
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<LI><B>Audio stream</B> (option <CODE>-oac copy</CODE>) : straightforward.</LI>
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</UL>
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</P>
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<P><B><A NAME=2.4.3.4>2.4.3.4. Fixing AVIs with broken index</B></P>
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<P>Easiest thing. We simply copy the video and audio streams, and
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<B>MEncoder</B> generates the index. Of course this cannot fix possible bugs in
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the video and/or audio streams.</P>
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<P>Command : <CODE>mencoder input.avi -ovc copy -oac copy -o output.avi</CODE></P>
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<P><B><A NAME=2.4.3.5>2.4.3.5. Encoding with the <I>libavcodec</I> codec family</B></P>
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<P><A HREF="codecs.html#2.2.1.2">libavcodec</A> provides simple encoding to a
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lot of interesting video and audio formats (currently its audio codecs are
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unsupported). You can encode to the following codecs :</P>
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<P>
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<UL>
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<LI>mjpeg - Motion JPEG</LI>
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<LI>h263 - H263</LI>
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<LI>h263p - H263 Plus</LI>
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<LI>mpeg4 - DivX4</LI>
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<LI>msmpeg4 - the old DivX</LI>
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<LI>rv10 - an old RealVideo codec</LI>
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<LI>mpeg1video - MPEG1 video :)</LI>
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</UL>
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</P>
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<P>The first column contains the codec names that should be passed after the
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<CODE>vcodec</CODE> config, like : <CODE>-lavcopts vcodec=msmpeg4</CODE></P>
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<P>An example, with MJPEG compression :<BR>
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<CODE> mencoder -dvd 2 -o title2.avi -ovc lavc -lavcopts vcodec=mjpeg -ffourcc mjpg</CODE></P>
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<P><B><A NAME=2.4.4>2.4.4. Syntax</B></P>
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<P> <CODE>mencoder [options] [input file] [options] ...</P>
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<P><B><A NAME=2.4.5>2.4.5. Available options</B></P>
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<P>NOTE : for all available options, <B>read the manpage !</B></P>
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<TABLE BORDER=0>
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<TR>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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<I>-o</I> filename</TD>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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specify output filename
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</TD>
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</TR>
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<TR>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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<I>-x</I> width in pixels</TD>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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rescale output video to given pixels width
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</TD>
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</TR>
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<TR>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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<I>-y</I> height in pixels</TD>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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rescale output video to given pixels height
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</TD>
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</TR>
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<TR>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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<I>-sws</I> 0-2</TD>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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type of scaling method<BR>
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0 - fast bilinear<BR>
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1 - bilinear<BR>
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2 - bicubic (best quality)<BR>
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</TD>
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</TR>
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<TR>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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<I>-ovc</I> codecname</TD>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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Encode with the given codec (codec names are from codecs.conf). Examples:<BR>
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<B>help</B> - get list of available codecs<BR>
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<B>copy</B> - no encoding, just copy the stream (only from AVI/ASF now)<BR>
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<B>divx4</B> - encode to DivX4<BR>
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<B>lavc</B> - encode with a codec from libavcodec<BR>
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</TD>
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</TR>
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<TR>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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<I>-oac</I> codecname</TD>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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Encode with the given codec (codec names are from codecs.conf). Examples:<BR>
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<B>help</B> - get list of available codecs<BR>
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<B>copy</B> - no encoding, just copy the stream (only from AVI/ASF now)<BR>
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<B>pcm</B> - encode to uncompressed PCM<BR>
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<B>mp3lame</B> - encode to MP3 (using Lame)<BR>
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</TD>
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</TR>
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<TR>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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<I>-divx4opts</I></TD>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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If encoding to DivX4, you can specify its parameters here, like:<BR>
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<CODE>-divx4opts br=1800:deinterlace:key=250</CODE><BR>
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Common options: <B>(for full list, check the manpage!)</B><BR>
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<B>help</B> - get help<BR>
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<B>br</B>=XXX - specify bitrate in kbit <4-16000> or bit <16001-24000000><BR>
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<B>q</B>=XXXX - quality (1-fastest, 5-best - default 5)<BR>
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<B>key</B>=XXXX - keyframe interval<BR>
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</TD>
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</TR>
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<TR>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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<I>-lavcopts</I></TD>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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If encoding with libavcodec, you can specify its parameters here, like:<BR>
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<CODE>-lavcopts vcodec=msmpeg4:vbitrate=1800:vhq:keyint=250</CODE><BR>
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Common options: <B>(for full list, check the manpage!)</B><BR>
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<B>help</B> - get help<BR>
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<B>vcodec</B>=XXX - select videocodec (for the full list, see the libavcodec section above)<BR>
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<B>vbitrate</B>=XXX - specify bitrate in kbit <4-16000> or bit <16001-24000000><BR>
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<B>vhq</B> - high quality<BR>
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<B>keyint</B>=XXX - keyframe interval<BR>
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</TD>
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</TR>
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<TR>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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<I>-lameopts</I></TD>
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<TD> </TD>
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<TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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If encoding to MP3 with libmp3lame, you can specify its parameters here, like:<BR>
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<CODE>-lameopts q=3</CODE><BR>
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<CODE>-lameopts br=192:cbr</CODE><BR>
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Common options: <B>(for full list, check the manpage!)</B><BR>
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<B>help</B> - get help<BR>
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<B>cbr</B> - select <B>CBR</B> MP3 (default is <B>VBR</B>)<BR>
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<B>br</B>=XXX - specify bitrate in kbit <0-1024> (this is for <B>CBR</B> only!)<BR>
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<B>q</B>=XXXX - quality (0-highest, 9-fastest - default 0) (this is for <B>VBR</B> only!)<BR>
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</TD>
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</TR>
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</TABLE>
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<P><B><A NAME=2.4.6>2.4.6. Examples</B></P>
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<P>Using <B>MEncoder</B> is the easiest thing on Earth. See the following :</P>
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<P>Encoding from DVD, title 2 :<BR>
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<CODE> mencoder -dvd 2 -o title2.avi</CODE></P>
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<P>The same, but with libavcodec family, MJPEG compression :<BR>
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<CODE> mencoder -dvd 2 -o title2.avi -ovc lavc -lavcopts vcodec=mjpeg -ffourcc mjpg</CODE></P>
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<P>Encoding from DVD, title 2, with rescaling :<BR>
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<CODE> mencoder -dvd 2 -x 640 -y 480 -sws 2 -o title2.avi</CODE></P>
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<P>Encoding from HTTP :<BR>
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<CODE> mencoder http://mplayer.hq/example.avi -o example.avi</CODE></P>
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<P>Encoding from a pipe :<BR>
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<CODE> rar p test-SVCD.rar | mencoder -divx4opts br=800 -ofps 24 -pass 1 -- -</CODE></P>
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<P>Encoding multiple *.vob files :<BR>
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<CODE> cat *.vob | mencoder <options> -</CODE></P>
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<P>Encoding from tuner (for tuner options <A HREF="documentation.html#2.5">see the TV input section !</A>) :<BR>
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<CODE> mencoder -tv on:driver=v4l:width=640:height=480 <options></CODE></P>
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<P>For all available options, <B><I>check the MEncoder man page !</I></B>
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<P>
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