b5dab3cb8b
multimux allows you to multiplex up to 8 mono WAV files into a single PCM audio data stream. Additionally, multimux can add a WAV header to this stream or pipe the stream to ffmpeg to create a multichannel AC3 file as commonly found in DVDs. submitted by Girish Venkatachalam, thanks. I used this to test multichannel support in cmpci.
109 lines
2.9 KiB
Groff
109 lines
2.9 KiB
Groff
.\" Copyright (c) 2007, Girish Venkatachalam, <girish1729@gmail.com>
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.Dd
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.Dt MULTIMUX 1
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.Os
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.Sh NAME
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.Nm multimux
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.Nd create multichannel audio files
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.Sh SYNOPSIS
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.Nm multimux
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.Bk -words
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.Op Fl fhirsv
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.Op Fl a Ar bitrate
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.Op Fl d Ar delay
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.Ek
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.Sh DESCRIPTION
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.Nm
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multiplexes up to 8 mono WAV audio files for various purposes such as
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creating 5.1 channel surround sound AC3 files commonly used in DVDs.
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.Pp
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.Sh OPTIONS
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl a
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AC3 bitrate in kilobits per second.
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Passed to ffmpeg when -f flag is used.
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.It Fl d
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Delays in milliseconds for audio channels.
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.It Fl f
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Encode output directly to AC3 via ffmpeg.
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Output file name will be Xch.ac3, where X is a single digit representing
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the number of channels.
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.It Fl h
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Display help message.
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.It Fl i
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Ignore data_length field in input WAV headers.
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This option is ignored when the -f flag is used.
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.It Fl r
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Output raw (headerless) PCM data.
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Useful for piping output when total output size > 4 GB.
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.It Fl s
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Silent mode.
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Expected output file size and bytes written information is not
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displayed.
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.It Fl v
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Verbose mode.
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Functions and arguments are displayed.
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.El
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.Pp
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.Sh EXAMPLES
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Create 5 channel (4.1) AC3 audio file 5ch.ac3.
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.Pp
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.Bd -filled -offset indent
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.Nm
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-f file1.wav file2.wav file3.wav file4.wav file5.wav
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.Ed
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.Pp
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Creates a WAV file with an English, Spanish, French and Italian channel.
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.Pp
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.Bd -filled -offset indent
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.Nm
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-d 0,0,0,0 English.wav Spanish.wav French.wav Italian.wav >
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english-spanish-french-italian.wav
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.Ed
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.Pp
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Use ffmpeg explicitly instead of invoking internally using the raw option.
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.Pp
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.Bd -filled -offset indent
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.Nm
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-r q1.wav q2.wav q3.wav q4.wav q5.wav | ffmpeg -f s16le -ac 5 -ar 48000
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-i /dev/stdin -ab 320k -acodec ac3 5ch.ac3
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.Ed
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.Pp
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Create 4channel.wav with delays.
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.Pp
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.Bd -filled -offset indent
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.Nm
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-d 0,1000,2000,3000 file1.wav file2.wav file3.wav file4.wav >
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4channel.wav
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.Ed
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.Pp
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Encode to 6 channel (5.1) AC3 file 6ch.ac3.
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.Pp
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.Bd -filled -offset indent
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.Nm
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-f file1.wav file2.wav file3.wav file4.wav file4.wav file5.wav file6.wav
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.Ed
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.Pp
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Create a raw (headerless PCM) output file.
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.Pp
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.Bd -filled -offset indent
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.Nm
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-r file1.wav file2.wav file3.wav file4.wav > 4ch.raw
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.Ed
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.Sh AUTHOR
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Jan Panteltje <panteltje@yahoo.com>
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