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Lists main A/V codecs supported by MEncoder, talks about how to select an imput file for encoding.
Taken from D. Richard Felker III The Great's encoding guide git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16535 b3059339-0415-0410-9bf9-f77b7e298cf2
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@ -14,6 +14,143 @@ for a wealth of discussions about all aspects of and problems related to
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encoding with <application>MEncoder</application>.
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</para>
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<sect1 id="menc-feat-selecting-codec">
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<title>Selecting codecs and container formats</title>
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<para>
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Audio and video codecs for encoding are selected with the
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<option>-oac</option> and <option>-ovc</option> options, respectively.
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The following choices are available, although some may not have been
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enabled at compiletime:
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</para>
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<para>
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Audio Codecs:
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<informaltable frame="all">
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<tgroup cols="2">
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<thead>
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<row><entry>Audio codec name</entry><entry>Description</entry></row>
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</thead>
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<tbody>
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<row>
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<entry>mp3lame</entry>
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<entry>Encode to VBR, ABR or CBR MP3 with LAME</entry>
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</row>
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<row>
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<entry>lavc</entry>
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<entry>Use one of libavcodec's audio encoders</entry>
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</row>
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<row>
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<entry>faac</entry>
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<entry>FAAC AAC audio encoder</entry>
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</row>
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<row>
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<entry>toolame</entry>
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<entry>MPEG Audio Layer 2 encoder</entry>
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</row>
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<row>
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<entry>twolame</entry>
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<entry>MPEG Audio Layer 2 encoder based on tooLAME</entry>
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</row>
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<row>
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<entry>pcm</entry>
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<entry>Uncompressed PCM audio</entry>
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</row>
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<row>
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<entry>copy</entry>
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<entry>Do not reencode, just copy compressed frames</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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<para>
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Video codecs:
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<informaltable frame="all">
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<tgroup cols="2">
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<thead>
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<row><entry>Video codec name</entry><entry>Description</entry></row>
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</thead>
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<tbody>
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<row>
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<entry>lavc</entry>
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<entry>Use one of libavcodec's video encoders</entry>
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</row>
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<row>
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<entry>xvid</entry>
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<entry>XviD, MPEG-4 Advanced Simple Profile codec</entry>
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</row>
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<row>
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<entry>x264</entry>
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<entry>x264, MPEG-4 AVC, aka H.264 codec</entry>
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</row>
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<row>
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<entry>nuv</entry>
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<entry>nuppel video, used by some realtime applications</entry>
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</row>
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<row>
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<entry>raw</entry>
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<entry>Uncompressed video frames</entry>
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</row>
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<row>
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<entry>copy</entry>
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<entry>Do not reencode, just copy compressed frames</entry>
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</row>
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<row>
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<entry>frameno</entry>
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<entry>Used for 3-pass encoding (not recommended)</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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</sect1>
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<sect1 id="menc-feat-selecting-input">
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<title>Selecting input file or device</title>
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<para>
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<application>MEncoder</application> can encode from files or directly
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from a DVD or VCD disc.
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Simply include the filename on the command line to encode from a file,
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or <option>dvd://</option><replaceable>titlenumber</replaceable> or
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<option>vcd://</option><replaceable>tracknumber</replaceable> to encode
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from a DVD title or VCD track.
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If you have already copied a DVD to your hard drive (you can use a tool
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such as <application>dvdbackup</application>, available on most systems),
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and wish to encode from the copy, you should still use the
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<option>dvd://</option> syntax, along with <option>-dvd-device</option>
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followed by the path to the copied DVD root.
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The <option>-dvd-device</option> and <option>-cdrom-device</option>
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options can also be used to override the paths to the device nodes
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for reading directly from disc, if the defaults of
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<filename>/dev/dvd</filename> and <filename>/dev/cdrom</filename> do
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not work on your system.
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</para>
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<para>
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When encoding from DVD, it is often desirable to select a chapter or
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range of chapters to encode.
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You can use the <option>-chapter</option> option for this purpose.
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For example, <option>-chapter</option> <replaceable>1-4</replaceable>
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will only encode chapters 1 through 4 from the DVD.
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This is especially useful if you will be making a 1400 MB encode
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targetted for two CDs, since you can ensure the split occurs exactly
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at a chapter boundary rather than in the middle of a scene.
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</para>
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<para>
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If you have a supported TV capture card, you can also encode from the
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TV-in device.
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Use <option>tv://</option><replaceable>channelnumber</replaceable> as
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the filename, and <option>-tv</option> to configure various capture
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settings.
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DVB input works similarly.
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</para>
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</sect1>
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<sect1 id="menc-feat-mpeg4">
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<title>Encoding two pass MPEG-4 ("DivX")</title>
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@ -21,7 +158,9 @@ encoding with <application>MEncoder</application>.
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The name comes from the fact that this method encodes the file <emphasis>twice</emphasis>.
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The first encoding (dubbed pass) creates some temporary files
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(<filename>*.log</filename>) with a size of few megabytes, do not delete
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them yet (you can delete the AVI). In the second pass, the two pass output
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them yet (you can delete the AVI or rather just not create any video by
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redirecting it into <filename>/dev/null</filename>).
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In the second pass, the two pass output
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file is created, using the bitrate data from the temporary files. The
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resulting file will have much better image quality. If this is the first
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time you heard about this, you should consult some guides available on the
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@ -31,10 +170,10 @@ net.
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<example>
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<title>copy audio track</title>
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<para>
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Two pass encode of a DVD to an MPEG-4 ("DivX") AVI while copying
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the audio track.
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Two pass encode of the second track a DVD to an MPEG-4 ("DivX")
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AVI while copying the audio track.
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<screen>
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mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=1 -oac copy -o <replaceable>movie.avi</replaceable>
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mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=1 -oac copy -o <replaceable>/dev/null</replaceable>
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mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=2 -oac copy -o <replaceable>movie.avi</replaceable>
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</screen>
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</para>
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@ -45,6 +184,8 @@ mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=2 -oac copy -o <replacea
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<para>
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Two pass encode of a DVD to an MPEG-4 ("DivX") AVI while encoding
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the audio track to MP3.
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Be careful using this method as it may lead to audio/video desync in
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some cases.
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<screen>
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mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=1 -oac mp3lame -lameopts vbr=3 -o <replaceable>movie.avi</replaceable>
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mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=2 -oac mp3lame -lameopts vbr=3 -o <replaceable>movie.avi</replaceable>
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