oggenc(1) Vorbis Tools oggenc(1)NAMEoggenc - encode audio into the Ogg Vorbis format
SYNOPSISoggenc [ -hrQ ] [ -B raw input sample size ] [ -C raw input number of
channels ] [ -R raw input samplerate ] [ -b nominal bitrate ] [ -m min‐
imum bitrate ] [ -M maximum bitrate ] [ -q quality ] [ --resample fre‐
quency ] [ --downmix ] [ -s serial ] [ -o output_file ] [ -n pattern ]
[ -c extra_comment ] [ -a artist ] [ -t title ] [ -l album ] [ -G genre
] input_files ...
DESCRIPTIONoggenc reads audio data in either raw, WAV, or AIFF format and encodes
it into an Ogg Vorbis stream. oggenc may also read audio data from
FLAC and Ogg FLAC files depending upon compile-time options. If the
input file "-" is specified, audio data is read from stdin and the Vor‐
bis stream is written to stdout unless the -o option is used to redi‐
rect the output. By default, disk files are output to Ogg Vorbis files
of the same name, with the extension changed to ".ogg". This naming
convention can be overridden by the -o option (in the case of one file)
or the -n option (in the case of several files). Finally, if none of
these are available, the output filename will be the input filename
with the extension (that part after the final dot) replaced with ogg,
so file.wav will become file.ogg
OPTIONS-h, --help
Show command help.
-v, --version
Show the version number.
-r, --raw
Assume input data is raw little-endian audio data with no header
information. If other options are not specified, defaults to
44.1kHz stereo 16 bit. See next three options for how to change
this.
-B n, --raw-bits=n
Sets raw mode input sample size in bits. Default is 16.
-C n, --raw-chan=n
Sets raw mode input number of channels. Default is 2.
-R n, --raw-rate=n
Sets raw mode input samplerate. Default is 44100.
--raw-endianness n
Sets raw mode endianness to big endian (1) or little endian (0).
Default is little endian.
-Q, --quiet
Quiet mode. No messages are displayed.
-b n, --bitrate=n
Sets target bitrate to n (in kb/s). The encoder will attempt to
encode at approximately this bitrate. By default, this remains a
VBR encoding. See the --managed option to force a managed
bitrate encoding at the selected bitrate.
-m n, --min-bitrate=n
Sets minimum bitrate to n (in kb/s). Enables bitrate management
mode (see --managed).
-M n, --max-bitrate=n
Sets maximum bitrate to n (in kb/s). Enables bitrate management
mode (see --managed).
--managed
Set bitrate management mode. This turns off the normal VBR
encoding, but allows hard or soft bitrate constraints to be
enforced by the encoder. This mode is much slower, and may also
be lower quality. It is primarily useful for creating files for
streaming.
-q n, --quality=n
Sets encoding quality to n, between -1 (very low) and 10 (very
high). This is the default mode of operation, with a default
quality level of 3. Fractional quality levels such as 2.5 are
permitted. Using this option allows the encoder to select an
appropriate bitrate based on your desired quality level.
--resample n
Resample input to the given sample rate (in Hz) before encoding.
Primarily useful for downsampling for lower-bitrate encoding.
--downmix
Downmix input from stereo to mono (has no effect on non-stereo
streams). Useful for lower-bitrate encoding.
--advanced-encode-option optionname=value
Sets an advanced option. See the Advanced Options section for
details.
-s, --serial
Forces a specific serial number in the output stream. This is
primarily useful for testing.
--discard-comments
Prevents comments in FLAC and Ogg FLAC files from being copied
to the output Ogg Vorbis file.
-o output_file, --output=output_file
Write the Ogg Vorbis stream to output_file (only valid if a sin‐
gle input file is specified).
-n pattern, --names=pattern
Produce filenames as this string, with %g, %a, %l, %n, %t, %d
replaced by genre, artist, album, track number, title, and date,
respectively (see below for specifying these). Also, %% gives a
literal %.
-X, --name-remove=s
Remove the specified characters from parameters to the -n format
string. This is useful to ensure legal filenames are generated.
-P, --name-replace=s
Replace characters removed by --name-remove with the characters
specified. If this string is shorter than the --name-remove
list, or is not specified, the extra characters are just
removed. The default settings for this option, and the -X option
above, are platform specific (and chosen to ensure legal file‐
names are generated for each platform).
-c comment, --comment comment
Add the string comment as an extra comment. This may be used
multiple times, and all instances will be added to each of the
input files specified. The argument should be in the form
"tag=value".
-a artist, --artist artist
Set the artist comment field in the comments to artist.
-G genre, --genre genre
Set the genre comment field in the comments to genre.
-d date, --date date
Sets the date comment field to the given value. This should be
the date of recording.
-N n, --tracknum n
Sets the track number comment field to the given value.
-t title, --title title
Set the track title comment field to title.
-l album, --album album
Set the album comment field to album.
Note that the -a, -t, and -l options can be given multiple times. They
will be applied, one to each file, in the order given. If there are
fewer album, title, or artist comments given than there are input
files, oggenc will reuse the final one for the remaining files, and
issue a warning in the case of repeated titles.
ADVANCED ENCODER OPTIONS
Oggenc allows you to set a number of advanced encoder options using the
--advanced-encode-option option. These are intended for very advanced
users only, and should be approached with caution. They may signifi‐
cantly degrade audio quality if misused. Not all these options are cur‐
rently documented.
lowpass_frequency=N
Set the lowpass frequency to N kHz.
impulse_noisetune=N
Set a noise floor bias N (range from -15. to 0.) for impulse
blocks. A negative bias instructs the encoder to pay special
attention to the crispness of transients in the encoded audio.
The tradeoff for better transient response is a higher bitrate.
bitrate_hard_max=N
Set the allowed bitrate maximum for the encoded file to N bits
per second. This bitrate may be exceeded only when there is
spare bits in the bit reservoir; if the bit reservoir is
exhausted, frames will be held under this value. This setting
must be used with --managed to have any effect.
bitrate_hard_min=N
Set the allowed bitrate minimum for the encoded file to N bits
per second. This bitrate may be underrun only when the bit
reservoir is not full; if the bit reservoir is full, frames will
be held over this value; if it impossible to add bits construc‐
tively, the frame will be padded with zeroes. This setting must
be used with --managed to have any effect.
bit_reservoir_bits=N
Set the total size of the bit reservoir to N bits; the default
size of the reservoir is equal to the nominal number of bits
coded in one second (eg, a nominal 128kbps file will have a bit
reservoir of 128000 bits by default). This option must be used
with --managed to have any effect and affects only minimum and
maximum bitrate management. Average bitrate encoding with no
hard bitrate boundaries does not use a bit reservoir.
bit_reservoir_bias=N
Set the behavior bias of the bit reservoir (range: 0. to 1.).
When set closer to 0, the bitrate manager attempts to hoard bits
for future use in sudden bitrate increases (biasing toward bet‐
ter transient reproduction). When set closer to 1, the bitrate
manager neglects transients in favor using bits for homogenous
passages. In the middle, the manager uses a balanced approach.
The default setting is .2, thus biasing slightly toward tran‐
sient reproduction.
bitrate_average=N
Set the average bitrate for the file to N bits per second. When
used without hard minimum or maximum limits, this option selects
reservoirless Average Bit Rate encoding, where the encoder
attempts to perfectly track a desired bitrate, but imposes no
strict momentary fluctuation limits. When used along with a
minimum or maximum limit, the average bitrate still sets the
average overall bitrate of the file, but will work within the
bounds set by the bit reservoir. When the min, max and average
bitrates are identical, oggenc produces Constant Bit Rate Vorbis
data.
bitrate_average_damping=N
Set the reaction time for the average bitrate tracker to N sec‐
onds. This number represents the fastest reaction the bitrate
tracker is allowed to make to hold the bitrate to the selected
average. The faster the reaction time, the less momentary fluc‐
tuation in the bitrate but (generally) the lower quality the
audio output. The slower the reaction time, the larger the ABR
fluctuations, but (generally) the better the audio. When used
along with min or max bitrate limits, this option directly
affects how deep and how quickly the encoder will dip into its
bit reservoir; the higher the number, the more demand on the bit
reservoir.
The setting must be greater than zero and the useful range is
approximately .05 to 10. The default is .75 seconds.
EXAMPLES
Simplest version. Produces output as somefile.ogg:
oggenc somefile.wav
Specifying an output filename:
oggenc somefile.wav -o out.ogg
Specifying a high-quality encoding averaging 256 kbps (but still VBR).
oggenc infile.wav -b 256 out.ogg
Specifying a maximum and average bitrate, and enforcing these.
oggenc infile.wav --managed -b 128 -M 160 out.ogg
Specifying quality rather than bitrate (to a very high quality mode)
oggenc infile.wav -q 6 out.ogg
Downsampling and downmixing to 11 kHz mono before encoding.
oggenc--resample 11025 --downmix infile.wav -q 1 out.ogg
Adding some info about the track:
oggenc somefile.wav -t "The track title" -a "artist who per‐
formed this" -l "name of album" -c "OTHERFIELD=contents of some
other field not explicitly supported"
This encodes the three files, each with the same artist/album tag, but
with different title tags on each one. The string given as an argument
to -n is used to generate filenames, as shown in the section above.
This example gives filenames like "The Tea Party - Touch.ogg":
oggenc-b 192 -a "The Tea Party" -l "Triptych" -t "Touch"
track01.wav -t "Underground" track02.wav -t "Great Big Lie"
track03.wav -n "%a - %t.ogg"
Encoding from stdin, to stdout (you can also use the various tagging
options, like -t, -a, -l, etc.):
oggenc-
AUTHORS
Program Author:
Michael Smith <msmith@xiph.org>
Manpage Author:
Stan Seibert <indigo@aztec.asu.edu>
BUGS
Reading type 3 wav files (floating point samples) probably doesn't work
other than on intel (or other 32 bit, little endian machines).
SEE ALSOvorbiscomment(1), ogg123(1), flac(1), speexenc(1), ffmpeg2theora(1)Xiph.Org Foundation 2005 March 3 oggenc(1)
