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#158 (Mencoder records two-channel audio from mono TV ...
https://trac.mplayerhq.hu/ticket/158
Software: MEncoder 1.0pre6-3.4.2 ===== Opening audio decoder: [mp3lib] MPEG layer-2, layer-3 AUDIO: 44100 Hz, 2 ch, 16 bit (0x10), ratio: 6000->176400 (48.0 kbit) Selected audio codec: [mp3] afm:mp3lib (mp3lib MPEG layer-2, layer-3) ===== ID_FILENAME=baz.avi ID_VIDEO_FORMAT=DIVX
mencoder(1): movie encoder - Linux man page
https://linux.die.net/man/1/mencoder
Head-related transfer function: Converts multichannel audio to 2 channel output for headphones, preserving the spatiality of the sound. Flag Meaning m matrix decoding of the rear channel s 2-channel matrix decoding 0 no matrix decoding (default) equalizer=[g1:g2:g3:...:g10] 10 octave band graphic equalizer, implemented using 10 IIR band pass filters.
MEncoder - LinuxTVWiki
https://www.linuxtv.org/wiki/index.php/MEncoder
MEncoder will also allow you to transcode the stream dump into something more useful, like XviD. Example: To transcode a dump to XviD 800kbps video and MP3 128kbps audio, type: $ mencoder -forceidx -vf scale=640:-2 -ovc xvid -xvidencopts bitrate=800 -oac mp3lame -lameopts cbr:br=128 stream.ts -o output.avi
Convert MKV to Xvid with Mencoder - Savvy Admin
https://savvyadmin.com/convert-mkv-to-xvid-with-mencoder/
The audio will simply be copied. mencoder movie.mkv -channels 6 -ovc xvid -xvidencopts fixed_quant=4 \-vf harddup -oac copy -o movie.avi. The Dolby Digital 5.1 (AC3) output was a major pain to figure out because by default, mencoder (and mplayer) only will select 2 audio channels. So increasing the value to 6 ensures you receive them all.
mencoder -oac 6 channel woes - VideoHelp Forum
https://forum.videohelp.com/threads/284031-mencoder-oac-6-channel-woes
For some reason, mencoder is defaulting to 2 channel ac3 when 6 channel (5.1) is desired for encoding movies. Here is my skinny, I’ve tried two different scenarios as follows. mencoder dvd://1 -dvd-device /archives/dvds/OFFICE_SPACE/ -alang English -oac alsa9 surround51 -channels 6 -ovc xvid -xvidencopts bitrate=2526 -o "/dev/null"
7.7. Using MEncoder to create QuickTime-compatible files
http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-quicktime-7.html
7.7.2. QuickTime 7 limitations. QuickTime 7 supports H.264 video and AAC audio, but it does not support them muxed in the AVI container format. However, you can use MEncoder to encode the video and audio, and then use an external program such as mp4creator (part of the MPEG4IP suite ) to remux the video and audio tracks into an MP4 container.
6.1. Selecting codecs and container formats
http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-selecting-codec.html
Audio codec name Description; 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
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