FFMPEG2THEORA(1)FFMPEG2THEORA(1)NAMEffmpeg2theora - command-line converter to create Ogg Theora and Ogg
Vorbis files.
SYNOPSISffmpeg2theora [options] inputfile
DESCRIPTION
This manual page documents briefly the ffmpeg2theora command.
ffmpeg2theora is a program that converts any media file that ffmpeg can
decode to Ogg Theora for video and Ogg Vorbis for audio.
OPTIONS
To read from standard input, specify `-' as the input filename.
These programs follow the usual GNU command line syntax, with long
options starting with two dashes (`-'). A summary of options is
included below.
General output options:
-o, --output
Specify the output filename. If no output filename is speci‐
fied, output will be written to inputfile.ogv. To output to
standard output, specify /dev/stdout as the output file.
--no-skeleton
Disables Ogg Skeleton metadata output.
--seek-index
Enables keyframe index in skeleton track.
-s, --starttime
Start encoding at this time (in seconds).
-e, --endtime
End encoding at this time (in seconds).
-p, --preset
Encode file with v2v preset. Right now, there is preview, pro
and videobin. Run “ffmpeg2theora -p info” for more information.
Video output options:
-v, --videoquality
[0 to 10] Set encoding quality for video (default: 6).
use higher values for better quality
-V, --videobitrate
Set encoding bitrate for video (in kb/s).
--soft-target
Use a large reservoir and treat the rate as a soft target; rate
control is less strict but resulting quality is usually
higher/smoother overall. Soft target also allows an optional -v
setting to specify a minimum allowed quality.
--two-pass
Compress input using two-pass rate control. This option
requires that the input to the to the encoder is seekable and
performs both passes automatically.
--first-pass <filename>
Perform first-pass of a two-pass rate controlled encoding, sav‐
ing pass data to <filename> for a later second pass
--second-pass <filename>
Perform second-pass of a two-pass rate controlled encoding,
reading first-pass data from <filename>. The first pass data
must come from a first encoding pass using identical input video
to work properly.
--optimize
Optimize output Theora video, using a full search for motion
vectors instead of a hierarchical one. This can reduce video
bitrate about 5%, but it is slower and therefore is disabled by
default.
--speedlevel
encoding is faster with higher values the cost is quality and
bandwidth (default 1) available values depend on the version of
libtheora check ffmpeg2theora--help for supported values.
-x, --width
Scale to given width (in pixels).
-y, --height
Scale to given height (in pixels).
--aspect
Define frame aspect ratio (e.g. 4:3, 16:9).
--pixel-aspect
Define pixel aspect ratio (e.g. 1:1, 4:3).
-F, --framerate
output framerate e.g 25:2 or 16
--croptop, --cropbottom, --cropleft, --cropright
Crop input by given pixels before resizing.
-K, --keyint
[8 to 2147483647] Set keyframe interval (default: 64).
-d, --buf-delay
Buffer delay (in frames). Longer delays allow smoother rate
adaptation and provide better overall quality, but require more
client side buffering and add latency. The default value is the
keyframe interval for one-pass encoding (or somewhat larger if
--soft-target is used) and infinite for two-pass encoding. (only
works in bitrate mode)
--no-upscaling
only scale video or resample audio if input is bigger than pro‐
vided parameter
Video transfer options:
--pp Video Postprocessing, denoise, deblock, deinterlacer use --pp
help for a list of available filters.
-C, --contrast
[0.1 to 10.0] contrast correction (default: 1.0). Note: lower
values make the video darker.
-B, --brightness
[-1.0 to 1.0] brightness correction (default: 0.0). Note: lower
values make the video darker.
-G, --gamma
[0.1 to 10.0] gamma correction (default: 1.0). Note: lower val‐
ues make the video darker.
-P, --saturation
[0.1 to 10.0] saturation correction (default: 1.0). Note: lower
values make the video grey.
Audio output options:
-a, --audioquality
[-2 to 10] Set encoding quality for audio (default: 1).
use higher values for better quality
-A, --audiobitrate
[32 to 500] Set encoding bitrate for audio (in kb/s).
-c, --channels
Set number of output channels.
-H, --samplerate
Set output samplerate (in Hz).
Input options:
--noaudio
Disable audio from input.
--novideo
Disable video from input.
--deinterlace
Force deinterlace. Otherwise only material marked as interlaced
will be deinterlaced.
--no-deinterlace
Force deinterlace off.
--vhook
you can use ffmpeg's vhook system, example:
ffmpeg2theora--vhook '/path/watermark.so -f wm.gif' input.dv
-f, --format
Specify input format.
--inputfps
Override input fps.
--audiostream id
By default the first audio stream is selected, use this to
select another audio stream.
--videostream id
By default the first video stream is selected, use this to
select another audio stream.
--sync Use A/V sync from input container. Since this does not work with
all input format you have to manualy enable it if you have
issues with A/V sync.
Subtitles options:
--subtitles
Encode subtitles from the given file to a multiplexed Kate
stream. The input file should be in SubRip (.srt) format,
encoded in UTF-8, unless the --subtitles-encoding option is also
given.
--subtitles-encoding encoding
Assumes the corresponding subtitles file is encoded in the given
encoding. If ffmpeg2theora was built with iconv support, all
encodings supported by iconv may be used. Otherwise, UTF-8 and
ISO-8859-1 (aka latin1) are supported. The default is UTF-8.
--subtitles-language language
Sets the language of the corresponding subtitles stream. This
will be set in the corresponding Kate stream so a video player
may make this available to the user for language selection. Lan‐
guage is an ISO 639-1 or RFC 3066 ASCII string and is limited to
15 characters.
--subtitles-category category
Sets the category of the corresponding subtitles stream. This
will be set in the corresponding Kate stream so a video player
may make this available to the user for selection. The default
category is "subtitles". Suggested other categories may include
"transcript", "commentary", "lyrics", etc. Category is an ASCII
string and is limited to 15 characters
--subtitles-ignore-non-utf8
When reading an UTF-8 subtitles text file, any invalid UTF-8
sequence will be ignored. This may be useful if there are stray
sequences in an otherwise UTF-8 file. Note that, since those
invalid sequences will be removed from the output, this option
is not a substitute to converting a non UTF-8 file to UTF-8.
--nosubtitles
Disables subtitles from input. Note that subtitles explicitely
loaded from external files will still be used.
--subtitle-types
Selects which subtitle types to include from the input file.
Allowed types are: none, all, text, spu (spu being the image
based subtitles found on DVD). By default, only text based sub‐
titles will be included. Note that subtitles explicitely loaded
from external files will still be used.
Metadata options:
--artist
Name of artist (director).
--title
Title.
--date Date.
--location
Location.
--organization
Name of organization (studio).
--copyright
Copyright.
--license
License.
--contact
Contact link.
--nometadata
disables metadata from input
--no-oshash
do not include oshash of source file(SOURCE_OSHASH)
Keyframe indexing options:
--index-interval <n>
set minimum distance between indexed keyframes to <n> ms
(default: 2000)
--theora-index-reserve <n>
reserve <n> bytes for theora keyframe index
--vorbis-index-reserve <n>
reserve <n> bytes for vorbis keyframe index
--kate-index-reserve <n>
reserve <n> bytes for kate keyframe index
Other options:
--nice n
Set niceness to n.
-h, --help
Output a help message.
--info Output json info about input file, use -o to save json to file.
--frontend
print status information in json, one json dict per line
EXAMPLES
Encode Videos:
ffmpeg2theora videoclip.avi (will write output to videoclip.ogv)
cat something.dv | ffmpeg2theora-f dv -o output.ogv -
Encode a series of images:
ffmpeg2theora frame%06d.png -o output.ogv
Live streaming from V4L Device:
ffmpeg2theora--no-skeleton /dev/video0 -f video4linux \
--inputfps 15 -x 160 -y 128 \
-o - | oggfwd icast2server 8000 password /theora.ogv
(you might have to use video4linux2 depending on your hardware)
Live encoding from a DV camcorder (needs a fast machine):
dvgrab - | ffmpeg2theora-f dv -x 352 -y 288 -o output.ogv -0
Live encoding and streaming to icecast server:
dvgrab --format raw - \
| ffmpeg2theora--no-skeleton -f dv -x 160 -y 128 -o /dev/stdout - \
| oggfwd icast2server 8000 password /theora.ogv
AUTHORffmpeg2theora was written by jan gerber <j@v2v.cc>.
This manual page was written by Hubert Chan <hubert@uhoreg.ca>, for the
Debian project (but may be used by others).
May 14, 2010 FFMPEG2THEORA(1)
