FFSERVER(1)FFSERVER(1)NAMEffserver - ffserver video server
SYNOPSISffserver [options]
DESCRIPTIONffserver 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 in 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.
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.
What can this do?
When properly configured and running, you can capture video and audio
in real time from a suitable capture card, and stream it out over the
Internet to either Windows Media Player or RealAudio player (with some
restrictions).
It can also stream from files, though that is currently broken. Very
often, a web server can be used to serve up the files just as well.
It can stream prerecorded video from .ffm files, though it is somewhat
tricky to make it work correctly.
How do I make it work?
First, build the kit. It *really* helps to have installed LAME first.
Then when you run the ffserver ./configure, make sure that you have the
"--enable-libmp3lame" flag turned on.
LAME is important as it allows for streaming audio to Windows Media
Player. Don't ask why the other audio types do not 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.
What happens next?
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.
Troubleshooting
I don't hear any audio, but video is fine.
Maybe you didn't install LAME, or got your ./configure statement wrong.
Check the ffmpeg output to see if a line referring to MP3 is present.
If not, then your configuration was incorrect. If it is, then maybe
your wiring is not set up correctly. Maybe the sound card is not
getting data from the right input source. Maybe you have a really awful
audio interface (like I do) that only captures in stereo and also
requires that one channel be flipped. If you are one of these people,
then export 'AUDIO_FLIP_LEFT=1' before starting ffmpeg.
The audio and video lose sync after a while.
Yes, they do.
After a long while, the video update rate goes way down in WMP.
Yes, it does. Who knows why?
WMP 6.4 behaves differently to WMP 7.
Yes, it does. Any thoughts on this would be gratefully received. These
differences extend to embedding WMP into a web page. [There are two
object IDs that you can use: The old one, which does not play well, and
the new one, which does (both tested on the same system). However, I
suspect that the new one is not available unless you have installed WMP
7].
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.
* You may want to adjust the MaxBandwidth in the ffserver.conf to limit
the amount of bandwidth consumed by live streams.
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=xxxxxx" 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.
What is FFM, FFM2
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.
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 multiplies, 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' for video, 'a' for audio, 's'
for subtitle, 'd' for data, and 't' for attachments. 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
Matches the stream by a format-specific ID.
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.
Possible values of arg are:
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.
-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.
-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 number or a string
containing one of the following values:
quiet
Show nothing at all; be silent.
panic
Only show fatal errors which could lead the process to crash,
such as and assert failure. This is not currently used for
anything.
fatal
Only show fatal errors. These are errors after which the
process absolutely cannot continue after.
error
Show all errors, including ones which can be recovered from.
warning
Show all warnings and errors. Any message related to possibly
incorrect or unexpected events will be shown.
info
Show informative messages during processing. This is in
addition to warnings and errors. This is the default value.
verbose
Same as "info", except more verbose.
debug
Show everything, including debugging information.
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; options 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 option is 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 "%"
Errors in parsing the environment variable are not fatal, and will
not appear in the report.
-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
xop
fma4
3dnow
3dnowext
cmov
ARM
armv5te
armv6
armv6t2
vfp
vfpv3
neon
PowerPC
altivec
Specific Processors
pentium2
pentium3
pentium4
k6
k62
athlon
athlonxp
k8
-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 obviously per-stream, so the chapter on stream
specifiers applies to them
Note -nooption syntax cannot be used for boolean AVOptions, use -option
0/-option 1.
Note2 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
Use configfile instead of /etc/ffserver.conf.
-n Enable no-launch mode. This option disables all the Launch
directives within the various <Stream> 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, directs log
messages to stdout.
SEE ALSOffserver-all(1), the doc/ffserver.conf example, ffmpeg(1), ffplay(1),
ffprobe(1), ffmpeg-utils(1), ffmpeg-scaler(1), ffmpeg-resampler(1),
ffmpeg-codecs(1), ffmpeg-bitstream-filters(1), ffmpeg-formats(1),
ffmpeg-devices(1), ffmpeg-protocols(1), ffmpeg-filters(1)AUTHORS
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
<http://source.ffmpeg.org>.
Maintainers for the specific components are listed in the file
MAINTAINERS in the source code tree.
2013-10-21 FFSERVER(1)
