ffserver Man page

Resume Wikipedia de FFmpeg

FFmpeg est une collection de logiciels libres destinés au traitement de flux audio ou vidéo (enregistrement, lecture ou conversion d’un format à un autre).
Ce projet a été créé par Fabrice Bellard en 2000, et est maintenant maintenu par Michael Niedermayer. Il est actuellement hébergé sur les serveurs du projet MPlayer. Il a été développé sous GNU/Linux mais peut cependant être compilé sur la plupart des systèmes d’exploitation, y compris Windows. Le choix de la licence GNU LGPL ou GNU GPL dépend du choix de configuration d’options.



ffserver – ffserver video server


ffserver [options]


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

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 “
section in the configuration file.

For each feed you can have different output streams in various formats,
each one specified by a “” section in the configuration file.



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:


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:


The stream access RTSP URL is given by:


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:

Format status

# Only allow local people to get the status
ACL allow localhost
ACL allow

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


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

* 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

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

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=xxxxxx” is fairly flexible. You should use one
of the following formats (the ‘T’ is literal):

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

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.


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:

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:

Print advanced tool options in addition to the basic tool

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

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

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

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

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

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

Show version.

Show available formats (including devices).

Show available devices.

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

Show available decoders.

Show all available encoders.

Show available bitstream filters.

Show available protocols.

Show available libavfilter filters.

Show available pixel formats.

Show available sample formats.

Show channel names and standard channel layouts.

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=

-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=

-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

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.

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

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:

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 “%”

set the log verbosity level using a numerical value (see

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.

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:

Specific Processors
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=:device_idx=

-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.

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:

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.

These options are specific to the given container, device or codec.
Private options are listed under their corresponding

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 “” sections. Since ffserver
will not launch any ffmpeg instances, you will have to launch them

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

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 “” on a
separate line and must be terminated by a line in the form
“. ARGS is optional.

Currently the following sections are recognized: Feed, Stream,

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.



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


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’ 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.

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

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:

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 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

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:

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.

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
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.

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

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 manual.

Default value is “160×128”.

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:

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

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

· Multipart JPEG

Feed feed1.ffm
Format mpjpeg
VideoFrameRate 2
Strict -1

· Single JPEG

Feed feed1.ffm
Format jpeg
VideoFrameRate 2
VideoSize 352×240
Strict -1

· Flash

Feed feed1.ffm
Format swf
VideoFrameRate 2

· ASF compatible

Feed feed1.ffm
Format asf
VideoFrameRate 15
VideoSize 352×240
VideoBitRate 256
VideoBufferSize 40
VideoGopSize 30
AudioBitRate 64

· MP3 audio

Feed feed1.ffm
Format mp2
AudioCodec mp3
AudioBitRate 64
AudioChannels 1
AudioSampleRate 44100

· Ogg Vorbis audio

Feed feed1.ffm
Metadata title “Stream title”
AudioBitRate 64
AudioChannels 2
AudioSampleRate 44100

· Real with audio only at 32 kbits

Feed feed1.ffm
Format rm
AudioBitRate 32

· Real with audio and video at 64 kbits

Feed feed1.ffm
Format rm
AudioBitRate 32
VideoBitRate 128
VideoFrameRate 25
VideoGopSize 25

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

File “/usr/local/httpd/htdocs/tlive.rm”

File “/usr/local/httpd/htdocs/test.asf”
Metadata author “Me”
Metadata copyright “Super MegaCorp”
Metadata title “Test stream from disk”
Metadata comment “Test comment”


ffserver-all(1), the doc/ffserver.conf example, ffmpeg, ffplay,
ffprobe, ffmpeg-utils, ffmpeg-scaler(1), ffmpeg-resampler(1),
ffmpeg-codecs(1), ffmpeg-bitstream-filters(1), ffmpeg-formats(1),
ffmpeg-devices(1), ffmpeg-protocols, ffmpeg-filters(1)

The FFmpeg developers.

For details about the authorship, see the Git history of the project
(git://source.ffmpeg.org/ffmpeg), e.g. by typing the command git log in
the FFmpeg source directory, or browsing the online repository at

Maintainers for the specific components are listed in the file
MAINTAINERS in the source code tree.