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Diffstat (limited to 'DOCS/xml/en/mencoder.xml')
| -rw-r--r-- | DOCS/xml/en/mencoder.xml | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/DOCS/xml/en/mencoder.xml b/DOCS/xml/en/mencoder.xml index 432adaae13..98497ff7ba 100644 --- a/DOCS/xml/en/mencoder.xml +++ b/DOCS/xml/en/mencoder.xml @@ -15,13 +15,13 @@ encoding with <application>MEncoder</application>. </para> <sect1 id="menc-feat-mpeg4"> -<title>Encoding 2-pass MPEG-4 ("DivX")</title> +<title>Encoding two pass MPEG-4 ("DivX")</title> <para> The name comes from the fact that this method encodes the file <emphasis>twice</emphasis>. The first encoding (dubbed pass) creates some temporary files (<filename>*.log</filename>) with a size of few megabytes, do not delete -them yet (you can delete the AVI). In the second pass, the 2-pass output +them yet (you can delete the AVI). In the second pass, the two pass output file is created, using the bitrate data from the temporary files. The resulting file will have much better image quality. If this is the first time you heard about this, you should consult some guides available on the @@ -31,7 +31,7 @@ net. <example> <title>copy audio track</title> <para> -2-pass encode of a DVD to an MPEG-4 ("DivX") AVI while copying +Two pass encode of a DVD to an MPEG-4 ("DivX") AVI while copying the audio track. <screen> mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=1 -oac copy -o <replaceable>movie.avi</replaceable> @@ -43,7 +43,7 @@ mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=2 -oac copy -o <replacea <example> <title>encode audio track</title> <para> -2-pass encode of a DVD to an MPEG-4 ("DivX") AVI while encoding +Two pass encode of a DVD to an MPEG-4 ("DivX") AVI while encoding the audio track to MP3. <screen> mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=1 -oac mp3lame -lameopts vbr=3 -o <replaceable>movie.avi</replaceable> @@ -393,7 +393,7 @@ before starting. </para> <example> -<title>Copying two subtitles from a DVD while doing 2-pass encoding</title> +<title>Copying two subtitles from a DVD while doing two pass encoding</title> <screen> rm subtitles.idx subtitles.sub mencoder dvd://1 -oac copy -ovc lavc -lavcopts vcodec=mpeg4:vpass=1 -vobsubout subtitles -vobsuboutindex 0 -sid 2 @@ -559,11 +559,11 @@ vcodec=mpeg2video:intra_matrix=8,9,12,22,26,27,29,34,9,10,14,26,27,29,34,37, </para> <sect2 id="menc-feat-dvd-mpeg4-2pass"> -<title>Constant Quantizer vs. 2-pass</title> +<title>Constant Quantizer vs. two pass</title> <para> There are three approaches to encoding the video: constant bitrate - (CBR), constant quantizer, and two-pass (ABR, or average bitrate). + (CBR), constant quantizer, and two pass (ABR, or average bitrate). </para> <para> @@ -615,7 +615,7 @@ vcodec=mpeg2video:intra_matrix=8,9,12,22,26,27,29,34,9,10,14,26,27,29,34,37, </para> <para> - With a two-pass encode, the first pass will rip the movie as though it + With a two pass encode, the first pass will rip the movie as though it were CBR, but it will keep a log of properties for each frame. This data is then used during the second pass in order to make intelligent decisions about which quantizers to use. During fast action or low @@ -627,14 +627,14 @@ vcodec=mpeg2video:intra_matrix=8,9,12,22,26,27,29,34,9,10,14,26,27,29,34,37, If you use <option>vqscale=2</option>, then you're wasting bits. If you use <option>vqscale=3</option>, then you're not getting the highest quality rip. Suppose you rip a DVD at <option>vqscale=3</option>, and - the result is 1800Kbit. If you do a two-pass encode with + the result is 1800Kbit. If you do a two pass encode with <option>vbitrate=1800</option>, the resulting video will have <emphasis role="bold">higher quality</emphasis> for the <emphasis role="bold">same bitrate</emphasis>. </para> <para> - Since you're now convinced that two-pass is the way to go, the real + Since you're now convinced that two pass is the way to go, the real question now is what bitrate to use? The answer is that there's no single answer. Ideally you want to choose a bitrate that yields the best balance between quality and file size. This is going to vary @@ -886,7 +886,7 @@ vcodec=mpeg2video:intra_matrix=8,9,12,22,26,27,29,34,9,10,14,26,27,29,34,37, </para> <para> - We're now ready to do the 2-pass encode. Pass 1: + We're now ready to do the two pass encode. Pass 1: <screen>mencoder dvd://1 -ofps 23.976 -oac copy -vf crop=720:352:0:62,hqdn3d=2:1:2 -ovc lavc \ -lavcopts vcodec=mpeg4:vbitrate=2400:v4mv:mbd=2:trell:cmp=3:subcmp=3:mbcmp=3:autoaspect:vpass=1 \ |