For the complete list of available MEncoder options and examples, please see the man page. For a series of hands-on examples and detailed guides on using several encoding parameters, read the encoding-tips that were collected from several mailing list threads on MPlayer-users. Search the archives for a wealth of discussions about all aspects of and problems related to encoding with MEncoder. Audio and video codecs for encoding are selected with the -oac and -ovc options, respectively. Type for instance: mencoder -ovc help to list all video codecs supported by the version of MEncoder on your machine. The following choices are available: Audio Codecs: Audio codec nameDescription mp3lame Encode to VBR, ABR or CBR MP3 with LAME lavc Use one of libavcodec's audio codecs faac FAAC AAC audio encoder toolame MPEG Audio Layer 2 encoder twolame MPEG Audio Layer 2 encoder based on tooLAME pcm Uncompressed PCM audio copy Do not reencode, just copy compressed frames Video codecs: Video codec nameDescription lavc Use one of libavcodec's video codecs xvid XviD, MPEG-4 Advanced Simple Profile (ASP) codec x264 x264, MPEG-4 Advanced Video Coding (AVC), AKA H.264 codec nuv nuppel video, used by some realtime applications raw Uncompressed video frames copy Do not reencode, just copy compressed frames frameno Used for 3-pass encoding (not recommended) Output container formats are selected with the -of option. Type: mencoder -of help to list all containers supported by the version of MEncoder on your machine. The following choices are available: Container formats: Container format nameDescription lavf One of the containers supported by libavformat avi Audio-Video Interleaved mpeg MPEG-1 and MPEG-2 PS rawvideo raw video stream (no muxing - one video stream only) rawaudio raw audio stream (no muxing - one audio stream only) The AVI container is the native container format for MEncoder, which means that it's the one that is best handled, and the one for which MEncoder was designed. As noted above, other container formats are usable, but you may experience problems when using them. libavformat containers: If you selected libavformat to do the muxing of the output file (by using the -of lavf), the appropriate container format will be determined by the file extension of the output file. You may force a particular container format with libavformat's format option. libavformat container nameDescription mpg MPEG-1 and MPEG-2 PS asf Advanced Streaming Format avi Audio-Video Interleaved wav Waveform Audio swf Macromedia Flash flv Macromedia Flash video rm RealMedia au SUN AU nut NUT open container (experimental and not yet spec-compliant) mov QuickTime mp4 MPEG-4 format dv Sony Digital Video container As you can see, libavformat allows MEncoder to mux into a considerable variety of containers. Unfortunately, as MEncoder was not designed from the beginning to support container formats other than AVI, your should really be paranoid about the resulting file. Please check to be sure that the audio/video synchronization is OK and that the file can be played correctly by players other than MPlayer. Example: Creating a Macromedia Flash video suitable for playback in a web browser with the Macromedia Flash plugin: mencoder input.avi -o output.flv -of lavf -oac mp3lame -lameopts abr:br=56 -ovc lavc \ -lavcopts vcodec=flv:vbitrate=500:mbd=2:mv0:trell:v4mv:cbp:last_pred=3 \ -srate 22050 MEncoder can encode from files or directly from a DVD or VCD disc. Simply include the filename on the command line to encode from a file, or dvd://titlenumber or vcd://tracknumber to encode from a DVD title or VCD track. If you have already copied a DVD to your hard drive (you can use a tool such as dvdbackup, available on most systems), and wish to encode from the copy, you should still use the dvd:// syntax, along with -dvd-device followed by the path to the copied DVD root. The -dvd-device and -cdrom-device options can also be used to override the paths to the device nodes for reading directly from disc, if the defaults of /dev/dvd and /dev/cdrom do not work on your system. When encoding from DVD, it is often desirable to select a chapter or range of chapters to encode. You can use the -chapter option for this purpose. For example, -chapter 1-4 will only encode chapters 1 through 4 from the DVD. This is especially useful if you will be making a 1400 MB encode targetted for two CDs, since you can ensure the split occurs exactly at a chapter boundary rather than in the middle of a scene. If you have a supported TV capture card, you can also encode from the TV-in device. Use tv://channelnumber as the filename, and -tv to configure various capture settings. DVB input works similarly. The name comes from the fact that this method encodes the file twice. The first encoding (dubbed pass) creates some temporary files (*.log) with a size of few megabytes, do not delete them yet (you can delete the AVI or rather just not create any video by redirecting it into /dev/null). 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 net. Two pass encode of the second track a DVD to an MPEG-4 ("DivX") AVI while copying the audio track. mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=1 -oac copy -o /dev/null mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=2 -oac copy -o output.avi Two pass encode of a DVD to an MPEG-4 ("DivX") AVI while encoding the audio track to MP3. Be careful using this method as it may lead to audio/video desync in some cases. mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=1 -oac mp3lame -lameopts vbr=3 -o /dev/null mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=2 -oac mp3lame -lameopts vbr=3 -o output.avi MEncoder can create MPEG (MPEG-PS) format output files. Usually, when you are using MPEG-1 or MPEG-2 video, it is because you are encoding for a constrained format such as SVCD, VCD, or DVD. The specific requirements for these formats are explained in the VCD and DVD creation guide section. To change MEncoder's output file format, use the -of mpeg option. Example: mencoder input.avi -of mpeg -ovc lavc -lavcopts vcodec=mpeg1video -oac copy other_options -o output.mpg Creating an MPEG-1 file suitable to be played on systems with minimal multimedia support, such as default Windows installs: mencoder input.avi -of mpeg -mpegopts format=mpeg1:tsaf:muxrate=2000 -o output.mpg -oac lavc -ovc lavc \ -lavcopts acodec=mp2:abitrate=224:vcodec=mpeg1video:vbitrate=1152:keyint=15:mbd=2:aspect=4/3 Often the need to resize movie images' size emerges. Its reasons can be many: decreasing file size, network bandwidth, etc. Most people even do rescaling when converting DVDs or SVCDs to DivX AVI. If you wish to rescale, read the Preserving aspect ratio section. The scaling process is handled by the scale video filter: -vf scale=width:height. Its quality can be set with the -sws option. If it is not specified, MEncoder will use 2: bicubic. Usage: mencoder input.mpg -ovc lavc -lavcopts vcodec=mpeg4 -vf scale=640:480 -o output.avi MEncoder can handle input streams in two ways: encode or copy them. This section is about copying. Video stream (option -ovc copy): nice stuff can be done :) Like, putting (not converting!) FLI or VIVO or MPEG-1 video into an AVI file! Of course only MPlayer can play such files :) And it probably has no real life value at all. Rationally: video stream copying can be useful for example when only the audio stream has to be encoded (like, uncompressed PCM to MP3). Audio stream (option -oac copy): straightforward. It is possible to take an external audio file (MP3, WAV) and mux it into the output stream. Use the -audiofile filename option for this. Using -oac copy to copy from one container format to another may require the use of -fafmttag to keep the audio format tag of the original file. For example, if you are converting an NSV file with AAC audio to an AVI container, the audio format tag will be incorrect and it will have to be changed. For a list of audio format tags, check codecs.conf. Example: mencoder input.nsv -oac copy -fafmttag 0x706D -ovc lavc -lavcopts vcodec=mpeg4 -o output.avi MEncoder is capable of creating movies from one or more JPEG, PNG or TGA files. With simple framecopy it can create MJPEG (Motion JPEG), MPNG (Motion PNG) or MTGA (Motion TGA) files. MEncoder decodes the input image(s) with libjpeg (when decoding PNGs, it will use libpng). MEncoder then feeds the decoded image to the chosen video compressor (DivX4, XviD, FFmpeg msmpeg4, etc.). The explanation of the -mf option is in the man page. Creating an MPEG-4 file from all the JPEG files in the current directory: mencoder mf://*.jpg -mf w=800:h=600:fps=25:type=jpg -ovc lavc -lavcopts vcodec=mpeg4 -oac copy -o output.avi Creating an MPEG-4 file from some JPEG files in the current directory: mencoder mf://frame001.jpg,frame002.jpg -mf w=800:h=600:fps=25:type=jpg -ovc lavc -lavcopts vcodec=mpeg4 -oac copy -o output.avi Creating a Motion JPEG (MJPEG) file from all the JPEG files in the current directory: mencoder mf://*.jpg -mf w=800:h=600:fps=25:type=jpg -ovc copy -oac copy -o output.avi Creating an uncompressed file from all the PNG files in the current directory: mencoder mf://*.png -mf w=800:h=600:fps=25:type=png -ovc raw -oac copy -o output.avi Width must be integer multiple of 4, it is a limitation of the RAW RGB AVI format. Creating a Motion PNG (MPNG) file from all the PNG files in the current directory: mencoder mf://*.png -mf w=800:h=600:fps=25:type=png -ovc copy -oac copy -o output.avi Creating a Motion TGA (MTGA) file from all the TGA files in the current directory: mencoder mf://*.tga -mf w=800:h=600:fps=25:type=tga -ovc copy -oac copy -o output.avi MEncoder is capable of extracting subtitles from a DVD into VOBsub formatted files. They consist of a pair of files ending in .idx and .sub and are usually packaged in a single .rar archive. MPlayer can play these with the -vobsub and -vobsubid options. You specify the basename (i.e without the .idx or .sub extension) of the output files with -vobsubout and the index for this subtitle in the resulting files with -vobsuboutindex. If the input is not from a DVD you should use -ifo to indicate the .ifo file needed to construct the resulting .idx file. If the input is not from a DVD and you do not have the .ifo file you will need to use the -vobsubid option to let it know what language id to put in the .idx file. Each run will append the running subtitle if the .idx and .sub files already exist. So you should remove any before starting. rm subtitles.idx subtitles.sub mencoder dvd://1 -oac copy -ovc lavc -lavcopts vcodec=mpeg4:vpass=1 -vobsubout subtitles -vobsuboutindex 0 -sid 2 mencoder dvd://1 -oac copy -ovc lavc -lavcopts vcodec=mpeg4:vpass=2 -vobsubout subtitles -vobsuboutindex 1 -sid 5 rm subtitles.idx subtitles.sub mencoder movie.mpg -ifo movie.ifo -vobsubout subtitles -vobsuboutindex 0 -vobsuboutid fr -sid 1 -nosound -ovc copy DVDs and SVCDs (i.e. MPEG-1/2) files contain an aspect ratio value, which describes how the player should scale the video stream, so humans will not have egg heads (ex.: 480x480 + 4:3 = 640x480). However when encoding to AVI (DivX) files, you have to be aware that AVI headers do not store this value. Rescaling the movie is disgusting and time consuming, there has to be a better way! There is MPEG-4 has an unique feature: the video stream can contain its needed aspect ratio. Yes, just like MPEG-1/2 (DVD, SVCD) and H.263 files. Regretfully, there are no video players outside which support this attribute of MPEG-4, except MPlayer. This feature can be used only with libavcodec's mpeg4 codec. Keep in mind: although MPlayer will correctly play the created file, other players will use the wrong aspect ratio. You seriously should crop the black bands over and below the movie image. See the man page for the usage of the cropdetect and crop filters. Usage mencoder sample-svcd.mpg -ovc lavc -lavcopts vcodec=mpeg4:autoaspect -vf crop=714:548:0:14 -oac copy -o output.avi