ffserver - Online in the Cloud

PROGRAM:

NAME

ffserver - ffserver video server

SYNOPSIS

ffserver [options]

DESCRIPTION

ffserver is a streaming server for both audio and video. It supports several live feeds,
streaming from files and time shifting on live feeds. You can seek to positions in the
past on each live feed, provided you specify a big enough feed storage.

ffserver is configured through a configuration file, which is read at startup. If not
explicitly specified, it will read from /etc/ffserver.conf.

ffserver receives prerecorded files or FFM streams from some ffmpeg instance as input,
then streams them over RTP/RTSP/HTTP.

An ffserver instance will listen on some port as specified in the configuration file. You
can launch one or more instances of ffmpeg and send one or more FFM streams to the port
where ffserver is expecting to receive them. Alternately, you can make ffserver launch
such ffmpeg instances at startup.

Input streams are called feeds, and each one is specified by a "<Feed>" section in the
configuration file.

For each feed you can have different output streams in various formats, each one specified
by a "<Stream>" section in the configuration file.

DETAILED DESCRIPTION

ffserver works by forwarding streams encoded by ffmpeg, or pre-recorded streams which are
read from disk.

Precisely, ffserver acts as an HTTP server, accepting POST requests from ffmpeg to acquire
the stream to publish, and serving RTSP clients or HTTP clients GET requests with the
stream media content.

A feed is an FFM stream created by ffmpeg, and sent to a port where ffserver is listening.

Each feed is identified by a unique name, corresponding to the name of the resource
published on ffserver, and is configured by a dedicated "Feed" section in the
configuration file.

The feed publish URL is given by:

http://<ffserver_ip_address>:<http_port>/<feed_name>

where ffserver_ip_address is the IP address of the machine where ffserver is installed,
http_port is the port number of the HTTP server (configured through the HTTPPort option),
and feed_name is the name of the corresponding feed defined in the configuration file.

Each feed is associated to a file which is stored on disk. This stored file is used to
send pre-recorded data to a player as fast as possible when new content is added in real-
time to the stream.

A "live-stream" or "stream" is a resource published by ffserver, and made accessible
through the HTTP protocol to clients.

A stream can be connected to a feed, or to a file. In the first case, the published stream
is forwarded from the corresponding feed generated by a running instance of ffmpeg, in the
second case the stream is read from a pre-recorded file.

Each stream is identified by a unique name, corresponding to the name of the resource
served by ffserver, and is configured by a dedicated "Stream" section in the configuration
file.

The stream access HTTP URL is given by:

http://<ffserver_ip_address>:<http_port>/<stream_name>[<options>]

The stream access RTSP URL is given by:

http://<ffserver_ip_address>:<rtsp_port>/<stream_name>[<options>]

stream_name is the name of the corresponding stream defined in the configuration file.
options is a list of options specified after the URL which affects how the stream is
served by ffserver. http_port and rtsp_port are the HTTP and RTSP ports configured with
the options HTTPPort and RTSPPort respectively.

In case the stream is associated to a feed, the encoding parameters must be configured in
the stream configuration. They are sent to ffmpeg when setting up the encoding. This
allows ffserver to define the encoding parameters used by the ffmpeg encoders.

The ffmpeg override_ffserver commandline option allows one to override the encoding
parameters set by the server.

Multiple streams can be connected to the same feed.

For example, you can have a situation described by the following graph:

_________ __________
| | | |
ffmpeg 1 -----| feed 1 |-----| stream 1 |
\ |_________|\ |__________|
\ \
\ \ __________
\ \ | |
\ \| stream 2 |
\ |__________|
\
\ _________ __________
\ | | | |
\| feed 2 |-----| stream 3 |
|_________| |__________|

_________ __________
| | | |
ffmpeg 2 -----| feed 3 |-----| stream 4 |
|_________| |__________|

_________ __________
| | | |
| file 1 |-----| stream 5 |
|_________| |__________|

FFM, FFM2 formats
FFM and FFM2 are formats used by ffserver. They allow storing a wide variety of video and
audio streams and encoding options, and can store a moving time segment of an infinite
movie or a whole movie.

FFM is version specific, and there is limited compatibility of FFM files generated by one
version of ffmpeg/ffserver and another version of ffmpeg/ffserver. It may work but it is
not guaranteed to work.

FFM2 is extensible while maintaining compatibility and should work between differing
versions of tools. FFM2 is the default.

Status stream
ffserver supports an HTTP interface which exposes the current status of the server.

Simply point your browser to the address of the special status stream specified in the
configuration file.

For example if you have:

<Stream status.html>
Format status

# Only allow local people to get the status
ACL allow localhost
ACL allow 192.168.0.0 192.168.255.255
</Stream>

then the server will post a page with the status information when the special stream
status.html is requested.

How do I make it work?
As a simple test, just run the following two command lines where INPUTFILE is some file
which you can decode with ffmpeg:

ffserver -f doc/ffserver.conf &
ffmpeg -i INPUTFILE http://localhost:8090/feed1.ffm

At this point you should be able to go to your Windows machine and fire up Windows Media
Player (WMP). Go to Open URL and enter

http://<linuxbox>:8090/test.asf

You should (after a short delay) see video and hear audio.

WARNING: trying to stream test1.mpg doesn't work with WMP as it tries to transfer the
entire file before starting to play. The same is true of AVI files.

You should edit the ffserver.conf file to suit your needs (in terms of frame rates etc).
Then install ffserver and ffmpeg, write a script to start them up, and off you go.

What else can it do?
You can replay video from .ffm files that was recorded earlier. However, there are a
number of caveats, including the fact that the ffserver parameters must match the original
parameters used to record the file. If they do not, then ffserver deletes the file before
recording into it. (Now that I write this, it seems broken).

You can fiddle with many of the codec choices and encoding parameters, and there are a
bunch more parameters that you cannot control. Post a message to the mailing list if there
are some 'must have' parameters. Look in ffserver.conf for a list of the currently
available controls.

It will automatically generate the ASX or RAM files that are often used in browsers. These
files are actually redirections to the underlying ASF or RM file. The reason for this is
that the browser often fetches the entire file before starting up the external viewer. The
redirection files are very small and can be transferred quickly. [The stream itself is
often 'infinite' and thus the browser tries to download it and never finishes.]

Tips
* When you connect to a live stream, most players (WMP, RA, etc) want to buffer a certain
number of seconds of material so that they can display the signal continuously. However,
ffserver (by default) starts sending data in realtime. This means that there is a pause of
a few seconds while the buffering is being done by the player. The good news is that this
can be cured by adding a '?buffer=5' to the end of the URL. This means that the stream
should start 5 seconds in the past -- and so the first 5 seconds of the stream are sent as
fast as the network will allow. It will then slow down to real time. This noticeably
improves the startup experience.

You can also add a 'Preroll 15' statement into the ffserver.conf that will add the 15
second prebuffering on all requests that do not otherwise specify a time. In addition,
ffserver will skip frames until a key_frame is found. This further reduces the startup
delay by not transferring data that will be discarded.

Why does the ?buffer / Preroll stop working after a time?
It turns out that (on my machine at least) the number of frames successfully grabbed is
marginally less than the number that ought to be grabbed. This means that the timestamp in
the encoded data stream gets behind realtime. This means that if you say 'Preroll 10',
then when the stream gets 10 or more seconds behind, there is no Preroll left.

Fixing this requires a change in the internals of how timestamps are handled.

Does the "?date=" stuff work.
Yes (subject to the limitation outlined above). Also note that whenever you start
ffserver, it deletes the ffm file (if any parameters have changed), thus wiping out what
you had recorded before.

The format of the "?date=x" is fairly flexible. You should use one of the following
formats (the 'T' is literal):

* YYYY-MM-DDTHH:MM:SS (localtime)
* YYYY-MM-DDTHH:MM:SSZ (UTC)

You can omit the YYYY-MM-DD, and then it refers to the current day. However note that
?date=16:00:00 refers to 16:00 on the current day -- this may be in the future and so is
unlikely to be useful.

You use this by adding the ?date= to the end of the URL for the stream. For example:
http://localhost:8080/test.asf?date=2002-07-26T23:05:00.

OPTIONS

All the numerical options, if not specified otherwise, accept a string representing a
number as input, which may be followed by one of the SI unit prefixes, for example: 'K',
'M', or 'G'.

If 'i' is appended to the SI unit prefix, the complete prefix will be interpreted as a
unit prefix for binary multiples, which are based on powers of 1024 instead of powers of
1000. Appending 'B' to the SI unit prefix multiplies the value by 8. This allows using,
for example: 'KB', 'MiB', 'G' and 'B' as number suffixes.

Options which do not take arguments are boolean options, and set the corresponding value
to true. They can be set to false by prefixing the option name with "no". For example
using "-nofoo" will set the boolean option with name "foo" to false.

Stream specifiers
Some options are applied per-stream, e.g. bitrate or codec. Stream specifiers are used to
precisely specify which stream(s) a given option belongs to.

A stream specifier is a string generally appended to the option name and separated from it
by a colon. E.g. "-codec:a:1 ac3" contains the "a:1" stream specifier, which matches the
second audio stream. Therefore, it would select the ac3 codec for the second audio stream.

A stream specifier can match several streams, so that the option is applied to all of
them. E.g. the stream specifier in "-b:a 128k" matches all audio streams.

An empty stream specifier matches all streams. For example, "-codec copy" or "-codec:
copy" would copy all the streams without reencoding.

Possible forms of stream specifiers are:

stream_index
Matches the stream with this index. E.g. "-threads:1 4" would set the thread count for
the second stream to 4.

stream_type[:stream_index]
stream_type is one of following: 'v' or 'V' for video, 'a' for audio, 's' for
subtitle, 'd' for data, and 't' for attachments. 'v' matches all video streams, 'V'
only matches video streams which are not attached pictures, video thumbnails or cover
arts. If stream_index is given, then it matches stream number stream_index of this
type. Otherwise, it matches all streams of this type.

p:program_id[:stream_index]
If stream_index is given, then it matches the stream with number stream_index in the
program with the id program_id. Otherwise, it matches all streams in the program.

#stream_id or i:stream_id
Match the stream by stream id (e.g. PID in MPEG-TS container).

m:key[:value]
Matches streams with the metadata tag key having the specified value. If value is not
given, matches streams that contain the given tag with any value.

u Matches streams with usable configuration, the codec must be defined and the essential
information such as video dimension or audio sample rate must be present.

Note that in ffmpeg, matching by metadata will only work properly for input files.

Generic options
These options are shared amongst the ff* tools.

-L Show license.

-h, -?, -help, --help [arg]
Show help. An optional parameter may be specified to print help about a specific item.
If no argument is specified, only basic (non advanced) tool options are shown.

Possible values of arg are:

long
Print advanced tool options in addition to the basic tool options.

full
Print complete list of options, including shared and private options for encoders,
decoders, demuxers, muxers, filters, etc.

decoder=decoder_name
Print detailed information about the decoder named decoder_name. Use the -decoders
option to get a list of all decoders.

encoder=encoder_name
Print detailed information about the encoder named encoder_name. Use the -encoders
option to get a list of all encoders.

demuxer=demuxer_name
Print detailed information about the demuxer named demuxer_name. Use the -formats
option to get a list of all demuxers and muxers.

muxer=muxer_name
Print detailed information about the muxer named muxer_name. Use the -formats
option to get a list of all muxers and demuxers.

filter=filter_name
Print detailed information about the filter name filter_name. Use the -filters
option to get a list of all filters.

-version
Show version.

-formats
Show available formats (including devices).

-devices
Show available devices.

-codecs
Show all codecs known to libavcodec.

Note that the term 'codec' is used throughout this documentation as a shortcut for
what is more correctly called a media bitstream format.

-decoders
Show available decoders.

-encoders
Show all available encoders.

-bsfs
Show available bitstream filters.

-protocols
Show available protocols.

-filters
Show available libavfilter filters.

-pix_fmts
Show available pixel formats.

-sample_fmts
Show available sample formats.

-layouts
Show channel names and standard channel layouts.

-colors
Show recognized color names.

-sources device[,opt1=val1[,opt2=val2]...]
Show autodetected sources of the intput device. Some devices may provide system-
dependent source names that cannot be autodetected. The returned list cannot be
assumed to be always complete.

ffmpeg -sources pulse,server=192.168.0.4

-sinks device[,opt1=val1[,opt2=val2]...]
Show autodetected sinks of the output device. Some devices may provide system-
dependent sink names that cannot be autodetected. The returned list cannot be assumed
to be always complete.

ffmpeg -sinks pulse,server=192.168.0.4

-loglevel [repeat+]loglevel | -v [repeat+]loglevel
Set the logging level used by the library. Adding "repeat+" indicates that repeated
log output should not be compressed to the first line and the "Last message repeated n
times" line will be omitted. "repeat" can also be used alone. If "repeat" is used
alone, and with no prior loglevel set, the default loglevel will be used. If multiple
loglevel parameters are given, using 'repeat' will not change the loglevel. loglevel
is a string or a number containing one of the following values:

quiet, -8
Show nothing at all; be silent.

panic, 0
Only show fatal errors which could lead the process to crash, such as and assert
failure. This is not currently used for anything.

fatal, 8
Only show fatal errors. These are errors after which the process absolutely cannot
continue after.

error, 16
Show all errors, including ones which can be recovered from.

warning, 24
Show all warnings and errors. Any message related to possibly incorrect or
unexpected events will be shown.

info, 32
Show informative messages during processing. This is in addition to warnings and
errors. This is the default value.

verbose, 40
Same as "info", except more verbose.

debug, 48
Show everything, including debugging information.

trace, 56

By default the program logs to stderr, if coloring is supported by the terminal,
colors are used to mark errors and warnings. Log coloring can be disabled setting the
environment variable AV_LOG_FORCE_NOCOLOR or NO_COLOR, or can be forced setting the
environment variable AV_LOG_FORCE_COLOR. The use of the environment variable NO_COLOR
is deprecated and will be dropped in a following FFmpeg version.

-report
Dump full command line and console output to a file named
"program-YYYYMMDD-HHMMSS.log" in the current directory. This file can be useful for
bug reports. It also implies "-loglevel verbose".

Setting the environment variable FFREPORT to any value has the same effect. If the
value is a ':'-separated key=value sequence, these options will affect the report;
option values must be escaped if they contain special characters or the options
delimiter ':' (see the ``Quoting and escaping'' section in the ffmpeg-utils manual).

The following options are recognized:

file
set the file name to use for the report; %p is expanded to the name of the
program, %t is expanded to a timestamp, "%%" is expanded to a plain "%"

level
set the log verbosity level using a numerical value (see "-loglevel").

For example, to output a report to a file named ffreport.log using a log level of 32
(alias for log level "info"):

FFREPORT=file=ffreport.log:level=32 ffmpeg -i input output

Errors in parsing the environment variable are not fatal, and will not appear in the
report.

-hide_banner
Suppress printing banner.

All FFmpeg tools will normally show a copyright notice, build options and library
versions. This option can be used to suppress printing this information.

-cpuflags flags (global)
Allows setting and clearing cpu flags. This option is intended for testing. Do not use
it unless you know what you're doing.

ffmpeg -cpuflags -sse+mmx ...
ffmpeg -cpuflags mmx ...
ffmpeg -cpuflags 0 ...

Possible flags for this option are:

x86
mmx
mmxext
sse
sse2
sse2slow
sse3
sse3slow
ssse3
atom
sse4.1
sse4.2
avx
avx2
xop
fma3
fma4
3dnow
3dnowext
bmi1
bmi2
cmov
ARM
armv5te
armv6
armv6t2
vfp
vfpv3
neon
setend
AArch64
armv8
vfp
neon
PowerPC
altivec
Specific Processors
pentium2
pentium3
pentium4
k6
k62
athlon
athlonxp
k8
-opencl_bench
This option is used to benchmark all available OpenCL devices and print the results.
This option is only available when FFmpeg has been compiled with "--enable-opencl".

When FFmpeg is configured with "--enable-opencl", the options for the global OpenCL
context are set via -opencl_options. See the "OpenCL Options" section in the ffmpeg-
utils manual for the complete list of supported options. Amongst others, these options
include the ability to select a specific platform and device to run the OpenCL code
on. By default, FFmpeg will run on the first device of the first platform. While the
options for the global OpenCL context provide flexibility to the user in selecting the
OpenCL device of their choice, most users would probably want to select the fastest
OpenCL device for their system.

This option assists the selection of the most efficient configuration by identifying
the appropriate device for the user's system. The built-in benchmark is run on all the
OpenCL devices and the performance is measured for each device. The devices in the
results list are sorted based on their performance with the fastest device listed
first. The user can subsequently invoke ffmpeg using the device deemed most
appropriate via -opencl_options to obtain the best performance for the OpenCL
accelerated code.

Typical usage to use the fastest OpenCL device involve the following steps.

Run the command:

ffmpeg -opencl_bench

Note down the platform ID (pidx) and device ID (didx) of the first i.e. fastest device
in the list. Select the platform and device using the command:

ffmpeg -opencl_options platform_idx=<pidx>:device_idx=<didx> ...

-opencl_options options (global)
Set OpenCL environment options. This option is only available when FFmpeg has been
compiled with "--enable-opencl".

options must be a list of key=value option pairs separated by ':'. See the ``OpenCL
Options'' section in the ffmpeg-utils manual for the list of supported options.

AVOptions
These options are provided directly by the libavformat, libavdevice and libavcodec
libraries. To see the list of available AVOptions, use the -help option. They are
separated into two categories:

generic
These options can be set for any container, codec or device. Generic options are
listed under AVFormatContext options for containers/devices and under AVCodecContext
options for codecs.

private
These options are specific to the given container, device or codec. Private options
are listed under their corresponding containers/devices/codecs.

For example to write an ID3v2.3 header instead of a default ID3v2.4 to an MP3 file, use
the id3v2_version private option of the MP3 muxer:

ffmpeg -i input.flac -id3v2_version 3 out.mp3

All codec AVOptions are per-stream, and thus a stream specifier should be attached to
them.

Note: the -nooption syntax cannot be used for boolean AVOptions, use -option 0/-option 1.

Note: the old undocumented way of specifying per-stream AVOptions by prepending v/a/s to
the options name is now obsolete and will be removed soon.

Main options
-f configfile
Read configuration file configfile. If not specified it will read by default from
/etc/ffserver.conf.

-n Enable no-launch mode. This option disables all the "Launch" directives within the
various "<Feed>" sections. Since ffserver will not launch any ffmpeg instances, you
will have to launch them manually.

-d Enable debug mode. This option increases log verbosity, and directs log messages to
stdout. When specified, the CustomLog option is ignored.

CONFIGURATION FILE SYNTAX

ffserver reads a configuration file containing global options and settings for each stream
and feed.

The configuration file consists of global options and dedicated sections, which must be
introduced by "<SECTION_NAME ARGS>" on a separate line and must be terminated by a line in
the form "</SECTION_NAME>". ARGS is optional.

Currently the following sections are recognized: Feed, Stream, Redirect.

A line starting with "#" is ignored and treated as a comment.

Name of options and sections are case-insensitive.

ACL syntax
An ACL (Access Control List) specifies the address which are allowed to access a given
stream, or to write a given feed.

It accepts the folling forms

· Allow/deny access to address.

ACL ALLOW <address>
ACL DENY <address>

· Allow/deny access to ranges of addresses from first_address to last_address.

ACL ALLOW <first_address> <last_address>
ACL DENY <first_address> <last_address>

You can repeat the ACL allow/deny as often as you like. It is on a per stream basis. The
first match defines the action. If there are no matches, then the default is the inverse
of the last ACL statement.

Thus 'ACL allow localhost' only allows access from localhost. 'ACL deny 1.0.0.0
1.255.255.255' would deny the whole of network 1 and allow everybody else.

Global options
HTTPPort port_number
Port port_number
RTSPPort port_number
HTTPPort sets the HTTP server listening TCP port number, RTSPPort sets the RTSP server
listening TCP port number.

Port is the equivalent of HTTPPort and is deprecated.

You must select a different port from your standard HTTP web server if it is running
on the same computer.

If not specified, no corresponding server will be created.

HTTPBindAddress ip_address
BindAddress ip_address
RTSPBindAddress ip_address
Set address on which the HTTP/RTSP server is bound. Only useful if you have several
network interfaces.

BindAddress is the equivalent of HTTPBindAddress and is deprecated.

MaxHTTPConnections n
Set number of simultaneous HTTP connections that can be handled. It has to be defined
before the MaxClients parameter, since it defines the MaxClients maximum limit.

Default value is 2000.

MaxClients n
Set number of simultaneous requests that can be handled. Since ffserver is very fast,
it is more likely that you will want to leave this high and use MaxBandwidth.

Default value is 5.

MaxBandwidth kbps
Set the maximum amount of kbit/sec that you are prepared to consume when streaming to
clients.

Default value is 1000.

CustomLog filename
Set access log file (uses standard Apache log file format). '-' is the standard
output.

If not specified ffserver will produce no log.

In case the commandline option -d is specified this option is ignored, and the log is
written to standard output.

NoDaemon
Set no-daemon mode. This option is currently ignored since now ffserver will always
work in no-daemon mode, and is deprecated.

UseDefaults
NoDefaults
Control whether default codec options are used for the all streams or not. Each
stream may overwrite this setting for its own. Default is UseDefaults. The lastest
occurrence overrides previous if multiple definitions.

Feed section
A Feed section defines a feed provided to ffserver.

Each live feed contains one video and/or audio sequence coming from an ffmpeg encoder or
another ffserver. This sequence may be encoded simultaneously with several codecs at
several resolutions.

A feed instance specification is introduced by a line in the form:

<Feed FEED_FILENAME>

where FEED_FILENAME specifies the unique name of the FFM stream.

The following options are recognized within a Feed section.

File filename
ReadOnlyFile filename
Set the path where the feed file is stored on disk.

If not specified, the /tmp/FEED.ffm is assumed, where FEED is the feed name.

If ReadOnlyFile is used the file is marked as read-only and it will not be deleted or
updated.

Truncate
Truncate the feed file, rather than appending to it. By default ffserver will append
data to the file, until the maximum file size value is reached (see FileMaxSize
option).

FileMaxSize size
Set maximum size of the feed file in bytes. 0 means unlimited. The postfixes "K"
(2^10), "M" (2^20), and "G" (2^30) are recognized.

Default value is 5M.

Launch args
Launch an ffmpeg command when creating ffserver.

args must be a sequence of arguments to be provided to an ffmpeg instance. The first
provided argument is ignored, and it is replaced by a path with the same dirname of
the ffserver instance, followed by the remaining argument and terminated with a path
corresponding to the feed.

When the launched process exits, ffserver will launch another program instance.

In case you need a more complex ffmpeg configuration, e.g. if you need to generate
multiple FFM feeds with a single ffmpeg instance, you should launch ffmpeg by hand.

This option is ignored in case the commandline option -n is specified.

ACL spec
Specify the list of IP address which are allowed or denied to write the feed. Multiple
ACL options can be specified.

Stream section
A Stream section defines a stream provided by ffserver, and identified by a single name.

The stream is sent when answering a request containing the stream name.

A stream section must be introduced by the line:

<Stream STREAM_NAME>

where STREAM_NAME specifies the unique name of the stream.

The following options are recognized within a Stream section.

Encoding options are marked with the encoding tag, and they are used to set the encoding
parameters, and are mapped to libavcodec encoding options. Not all encoding options are
supported, in particular it is not possible to set encoder private options. In order to
override the encoding options specified by ffserver, you can use the ffmpeg
override_ffserver commandline option.

Only one of the Feed and File options should be set.

Feed feed_name
Set the input feed. feed_name must correspond to an existing feed defined in a "Feed"
section.

When this option is set, encoding options are used to setup the encoding operated by
the remote ffmpeg process.

File filename
Set the filename of the pre-recorded input file to stream.

When this option is set, encoding options are ignored and the input file content is
re-streamed as is.

Format format_name
Set the format of the output stream.

Must be the name of a format recognized by FFmpeg. If set to status, it is treated as
a status stream.

InputFormat format_name
Set input format. If not specified, it is automatically guessed.

Preroll n
Set this to the number of seconds backwards in time to start. Note that most players
will buffer 5-10 seconds of video, and also you need to allow for a keyframe to appear
in the data stream.

Default value is 0.

StartSendOnKey
Do not send stream until it gets the first key frame. By default ffserver will send
data immediately.

MaxTime n
Set the number of seconds to run. This value set the maximum duration of the stream a
client will be able to receive.

A value of 0 means that no limit is set on the stream duration.

ACL spec
Set ACL for the stream.

DynamicACL spec
RTSPOption option
MulticastAddress address
MulticastPort port
MulticastTTL integer
NoLoop
FaviconURL url
Set favicon (favourite icon) for the server status page. It is ignored for regular
streams.

Author value
Comment value
Copyright value
Title value
Set metadata corresponding to the option. All these options are deprecated in favor of
Metadata.

Metadata key value
Set metadata value on the output stream.

UseDefaults
NoDefaults
Control whether default codec options are used for the stream or not. Default is
UseDefaults unless disabled globally.

NoAudio
NoVideo
Suppress audio/video.

AudioCodec codec_name (encoding,audio)
Set audio codec.

AudioBitRate rate (encoding,audio)
Set bitrate for the audio stream in kbits per second.

AudioChannels n (encoding,audio)
Set number of audio channels.

AudioSampleRate n (encoding,audio)
Set sampling frequency for audio. When using low bitrates, you should lower this
frequency to 22050 or 11025. The supported frequencies depend on the selected audio
codec.

AVOptionAudio [codec:]option value (encoding,audio)
Set generic or private option for audio stream. Private option must be prefixed with
codec name or codec must be defined before.

AVPresetAudio preset (encoding,audio)
Set preset for audio stream.

VideoCodec codec_name (encoding,video)
Set video codec.

VideoBitRate n (encoding,video)
Set bitrate for the video stream in kbits per second.

VideoBitRateRange range (encoding,video)
Set video bitrate range.

A range must be specified in the form minrate-maxrate, and specifies the minrate and
maxrate encoding options expressed in kbits per second.

VideoBitRateRangeTolerance n (encoding,video)
Set video bitrate tolerance in kbits per second.

PixelFormat pixel_format (encoding,video)
Set video pixel format.

Debug integer (encoding,video)
Set video debug encoding option.

Strict integer (encoding,video)
Set video strict encoding option.

VideoBufferSize n (encoding,video)
Set ratecontrol buffer size, expressed in KB.

VideoFrameRate n (encoding,video)
Set number of video frames per second.

VideoSize (encoding,video)
Set size of the video frame, must be an abbreviation or in the form WxH. See the
Video size section in the ffmpeg-utils(1) manual.

Default value is "160x128".

VideoIntraOnly (encoding,video)
Transmit only intra frames (useful for low bitrates, but kills frame rate).

VideoGopSize n (encoding,video)
If non-intra only, an intra frame is transmitted every VideoGopSize frames. Video
synchronization can only begin at an intra frame.

VideoTag tag (encoding,video)
Set video tag.

VideoHighQuality (encoding,video)
Video4MotionVector (encoding,video)
BitExact (encoding,video)
Set bitexact encoding flag.

IdctSimple (encoding,video)
Set simple IDCT algorithm.

Qscale n (encoding,video)
Enable constant quality encoding, and set video qscale (quantization scale) value,
expressed in n QP units.

VideoQMin n (encoding,video)
VideoQMax n (encoding,video)
Set video qmin/qmax.

VideoQDiff integer (encoding,video)
Set video qdiff encoding option.

LumiMask float (encoding,video)
DarkMask float (encoding,video)
Set lumi_mask/dark_mask encoding options.

AVOptionVideo [codec:]option value (encoding,video)
Set generic or private option for video stream. Private option must be prefixed with
codec name or codec must be defined before.

AVPresetVideo preset (encoding,video)
Set preset for video stream.

preset must be the path of a preset file.

Server status stream

A server status stream is a special stream which is used to show statistics about the
ffserver operations.

It must be specified setting the option Format to status.

Redirect section
A redirect section specifies where to redirect the requested URL to another page.

A redirect section must be introduced by the line:

<Redirect NAME>

where NAME is the name of the page which should be redirected.

It only accepts the option URL, which specify the redirection URL.

STREAM EXAMPLES

· Multipart JPEG

<Stream test.mjpg>
Feed feed1.ffm
Format mpjpeg
VideoFrameRate 2
VideoIntraOnly
NoAudio
Strict -1
</Stream>

· Single JPEG

<Stream test.jpg>
Feed feed1.ffm
Format jpeg
VideoFrameRate 2
VideoIntraOnly
VideoSize 352x240
NoAudio
Strict -1
</Stream>

· Flash

<Stream test.swf>
Feed feed1.ffm
Format swf
VideoFrameRate 2
VideoIntraOnly
NoAudio
</Stream>

· ASF compatible

<Stream test.asf>
Feed feed1.ffm
Format asf
VideoFrameRate 15
VideoSize 352x240
VideoBitRate 256
VideoBufferSize 40
VideoGopSize 30
AudioBitRate 64
StartSendOnKey
</Stream>

· MP3 audio

<Stream test.mp3>
Feed feed1.ffm
Format mp2
AudioCodec mp3
AudioBitRate 64
AudioChannels 1
AudioSampleRate 44100
NoVideo
</Stream>

· Ogg Vorbis audio

<Stream test.ogg>
Feed feed1.ffm
Metadata title "Stream title"
AudioBitRate 64
AudioChannels 2
AudioSampleRate 44100
NoVideo
</Stream>

· Real with audio only at 32 kbits

<Stream test.ra>
Feed feed1.ffm
Format rm
AudioBitRate 32
NoVideo
</Stream>

· Real with audio and video at 64 kbits

<Stream test.rm>
Feed feed1.ffm
Format rm
AudioBitRate 32
VideoBitRate 128
VideoFrameRate 25
VideoGopSize 25
</Stream>

· For stream coming from a file: you only need to set the input filename and optionally
a new format.

<Stream file.rm>
File "/usr/local/httpd/htdocs/tlive.rm"
NoAudio
</Stream>

<Stream file.asf>
File "/usr/local/httpd/htdocs/test.asf"
NoAudio
Metadata author "Me"
Metadata copyright "Super MegaCorp"
Metadata title "Test stream from disk"
Metadata comment "Test comment"
</Stream>

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