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ffserver documentation update
Originally committed as revision 1234 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard
parent
47d944d2be
commit
c70a211997
@ -1,4 +1,4 @@
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all: ffmpeg-doc.html faq.html
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all: ffmpeg-doc.html faq.html ffserver-doc.html
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%.html: %.texi
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texi2html -monolithic -number $<
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306
doc/ffserver-doc.html
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306
doc/ffserver-doc.html
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@ -0,0 +1,306 @@
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<HTML>
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<HEAD>
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<!-- Created by texi2html 1.56k from ffserver-doc.texi on 19 November 2002 -->
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<TITLE>FFserver Documentation</TITLE>
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</HEAD>
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<BODY>
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<H1>FFserver Documentation</H1>
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<P>
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<P><HR><P>
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<H1>Table of Contents</H1>
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<UL>
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<LI><A NAME="TOC1" HREF="ffserver-doc.html#SEC1">1. Introduction</A>
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<LI><A NAME="TOC2" HREF="ffserver-doc.html#SEC2">2. QuickStart</A>
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<UL>
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<LI><A NAME="TOC3" HREF="ffserver-doc.html#SEC3">2.1 What can this do?</A>
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<LI><A NAME="TOC4" HREF="ffserver-doc.html#SEC4">2.2 What do I need?</A>
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<LI><A NAME="TOC5" HREF="ffserver-doc.html#SEC5">2.3 How do I make it work?</A>
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<LI><A NAME="TOC6" HREF="ffserver-doc.html#SEC6">2.4 What happens next?</A>
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<LI><A NAME="TOC7" HREF="ffserver-doc.html#SEC7">2.5 Troubleshooting</A>
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<UL>
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<LI><A NAME="TOC8" HREF="ffserver-doc.html#SEC8">2.5.1 I don't hear any audio, but video is fine</A>
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<LI><A NAME="TOC9" HREF="ffserver-doc.html#SEC9">2.5.2 The audio and video loose sync after a while.</A>
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<LI><A NAME="TOC10" HREF="ffserver-doc.html#SEC10">2.5.3 After a long while, the video update rate goes way down in WMP.</A>
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<LI><A NAME="TOC11" HREF="ffserver-doc.html#SEC11">2.5.4 WMP 6.4 behaves differently to WMP 7.</A>
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</UL>
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<LI><A NAME="TOC12" HREF="ffserver-doc.html#SEC12">2.6 What else can it do?</A>
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<LI><A NAME="TOC13" HREF="ffserver-doc.html#SEC13">2.7 Tips</A>
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<LI><A NAME="TOC14" HREF="ffserver-doc.html#SEC14">2.8 Why does the ?buffer / Preroll stop working after a time?</A>
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<LI><A NAME="TOC15" HREF="ffserver-doc.html#SEC15">2.9 Does the <CODE>?date=</CODE> stuff work.</A>
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</UL>
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</UL>
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<P><HR><P>
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<P>
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FFserver Documentation
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<H1><A NAME="SEC1" HREF="ffserver-doc.html#TOC1">1. Introduction</A></H1>
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<P>
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FFserver is a streaming server for both audio and video. It supports
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several live feeds, streaming from files and time shifting on live feeds
|
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(you can seek to positions in the past on each live feed, provided you
|
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specify a big enough feed storage in ffserver.conf).
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<P>
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This documentation covers only the streaming aspects of ffserver /
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ffmpeg. All questions about parameters for ffmpeg, codec questions,
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etc. are not covered here. Read <TT>`ffmpeg-doc.[texi|html]'</TT> for more
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information.
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<H1><A NAME="SEC2" HREF="ffserver-doc.html#TOC2">2. QuickStart</A></H1>
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<P>
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[Contributed by Philip Gladstone, philip-ffserver at gladstonefamily dot net]
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<H2><A NAME="SEC3" HREF="ffserver-doc.html#TOC3">2.1 What can this do?</A></H2>
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<P>
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When properly configured and running, you can capture video and audio in real
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time from a suitable capture card, and stream it out over the Internet to
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either Windows Media Player or RealAudio player (with some restrictions).
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|
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<P>
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It can also stream from files, though that is currently broken. Very often, a
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web server can be used to serve up the files just as well.
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<H2><A NAME="SEC4" HREF="ffserver-doc.html#TOC4">2.2 What do I need?</A></H2>
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<P>
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I use Linux on a 900MHz Duron with a cheapo Bt848 based TV capture card. I'm
|
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using stock linux 2.4.17 with the stock drivers. [Actually that isn't true,
|
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I needed some special drivers from my motherboard based sound card.]
|
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|
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|
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<P>
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I understand that FreeBSD systems work just fine as well.
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<H2><A NAME="SEC5" HREF="ffserver-doc.html#TOC5">2.3 How do I make it work?</A></H2>
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<P>
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First, build the kit. It *really* helps to have installed LAME first. Then when
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you run the ffserver ./configure, make sure that you have the --enable-mp3lame
|
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flag turned on.
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<P>
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LAME is important as it allows streaming of audio to Windows Media Player. Don't
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ask why the other audio types do not work.
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<P>
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As a simple test, just run the following two command lines:
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<PRE>
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./ffserver -f doc/ffserver.conf &
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./ffmpeg http://localhost:8090/feed1.ffm
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</PRE>
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<P>
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At this point you should be able to go to your windows machine and fire up
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Windows Media Player (WMP). Go to Open URL and enter
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<PRE>
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http://<linuxbox>:8090/test.asf
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</PRE>
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<P>
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You should see (after a short delay) video and hear audio.
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<P>
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WARNING: trying to stream test1.mpg doesn't work with WMP as it tries to
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transfer the entire file before starting to play.
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<H2><A NAME="SEC6" HREF="ffserver-doc.html#TOC6">2.4 What happens next?</A></H2>
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<P>
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You should edit the ffserver.conf file to suit your needs (in terms of
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frame rates etc). Then install ffserver and ffmpeg, write a script to start
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them up, and off you go.
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<H2><A NAME="SEC7" HREF="ffserver-doc.html#TOC7">2.5 Troubleshooting</A></H2>
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<H3><A NAME="SEC8" HREF="ffserver-doc.html#TOC8">2.5.1 I don't hear any audio, but video is fine</A></H3>
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<P>
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Maybe you didn't install LAME, or get your ./configure statement right. Check
|
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the ffmpeg output to see if a line referring to mp3 is present. If not, then
|
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your configuration was incorrect. If it is, then maybe your wiring is not
|
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setup correctly. Maybe the sound card is not getting data from the right
|
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input source. Maybe you have a really awful audio interface (like I do)
|
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that only captures in stereo and also requires that one channel be flipped.
|
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If you are one of these people, then export 'AUDIO_FLIP_LEFT=1' before
|
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starting ffmpeg.
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|
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|
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<H3><A NAME="SEC9" HREF="ffserver-doc.html#TOC9">2.5.2 The audio and video loose sync after a while.</A></H3>
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<P>
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Yes, they do.
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<H3><A NAME="SEC10" HREF="ffserver-doc.html#TOC10">2.5.3 After a long while, the video update rate goes way down in WMP.</A></H3>
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<P>
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Yes, it does. Who knows why?
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<H3><A NAME="SEC11" HREF="ffserver-doc.html#TOC11">2.5.4 WMP 6.4 behaves differently to WMP 7.</A></H3>
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<P>
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Yes, it does. Any thoughts on this would be gratefully received. These
|
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differences extend to embedding WMP into a web page. [There are two
|
||||
different object ids that you can use, one of them -- the old one -- cannot
|
||||
play very well, and the new one works well (both on the same system). However,
|
||||
I suspect that the new one is not available unless you have installed WMP 7].
|
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<H2><A NAME="SEC12" HREF="ffserver-doc.html#TOC12">2.6 What else can it do?</A></H2>
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<P>
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There seems to be a bunch of code that allows you to replay previous
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video. I've never tried it, so it probably doesn't work properly. YMMV.
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In fact, in order to get some level of stability, ffserver now deletes
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all the previously sent video whenever it restarts.
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<P>
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You can fiddle with many of the codec choices and encoding parameters, and
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there are a bunch more parameters that you cannot control. Post a message
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to the mailing list if there are some 'must have' parameters. Look in the
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ffserver.conf for a list of the currently available controls.
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<P>
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It will automatically generate the .ASX or .RAM files that are often used
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in browsers. These files are actually redirections to the underlying .ASF
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or .RM file. The reason for this is that the browser often fetches the
|
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entire file before starting up the external viewer. The redirection files
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are very small and can be transferred quickly. [The stream itself is
|
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often 'infinite' and thus the browser tries to download it and never
|
||||
finishes.]
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<H2><A NAME="SEC13" HREF="ffserver-doc.html#TOC13">2.7 Tips</A></H2>
|
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|
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<P>
|
||||
* When you connect to a live stream, most players (WMP, RA etc) want to
|
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buffer a certain number of seconds of material so that they can display the
|
||||
signal continuously. However, ffserver (by default) starts sending data
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in real time. This means that there is a pause of a few seconds while the
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buffering is being done by the player. The good news is that this can be
|
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cured by adding a '?buffer=5' to the end of the URL. This says that the
|
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stream should start 5 seconds in the past -- and so the first 5 seconds
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of the stream is sent as fast as the network will allow. It will then
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slow down to real time. This noticeably improves the startup experience.
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||||
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<P>
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||||
You can also add a 'Preroll 15' statement into the ffserver.conf that will
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add the 15 second prebuffering on all requests that do not otherwise
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||||
specify a time. In addition, ffserver will skip frames until a key_frame
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is found. This further reduces the startup delay by not transferring data
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that will be discarded.
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<P>
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* You may want to adjust the MaxBandwidth in the ffserver.conf to limit
|
||||
the amount of bandwidth consumed by live streams.
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|
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||||
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<H2><A NAME="SEC14" HREF="ffserver-doc.html#TOC14">2.8 Why does the ?buffer / Preroll stop working after a time?</A></H2>
|
||||
|
||||
<P>
|
||||
It turns out that (on my machine at least) the number of frames successfully
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grabbed is marginally less than the number that ought to be grabbed. This
|
||||
means that the timestamp in the encoded data stream gets behind real time.
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This means that if you say 'preroll 10', then when the stream gets 10
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or more seconds behind, there is no preroll left.
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<P>
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Fixing this requires a require in the internals in how timestampts are
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handled.
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<H2><A NAME="SEC15" HREF="ffserver-doc.html#TOC15">2.9 Does the <CODE>?date=</CODE> stuff work.</A></H2>
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|
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<P>
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||||
Yes (subject to the caution above). Also note that whenever you start
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ffserver, it deletes the ffm file, thus wiping out what you had recorded
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before. This behaviour is a temporary fix to various crashes. The aim is
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to fix it so that the old data is saved if possible.
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<P>
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The format of the <CODE>?date=xxxxxx</CODE> is fairly flexible. You should use one
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of the following formats (the 'T' is literal):
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||||
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||||
|
||||
|
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<PRE>
|
||||
* YYYY-MM-DDTHH:MM:SS (localtime)
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* YYYY-MM-DDTHH:MM:SSZ (UTC)
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</PRE>
|
||||
|
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<P>
|
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You can omit the YYYY-MM-DD, and then it refers to the current day. However
|
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note that <SAMP>`?date=16:00:00'</SAMP> refers to 4PM on the current day -- this may be
|
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in the future and so unlikely to useful.
|
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|
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|
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<P>
|
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You use this by adding the ?date= to the end of the URL for the stream.
|
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For example: <SAMP>`http://localhost:8080/test.asf?date=2002-07-26T23:05:00'</SAMP>.
|
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|
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|
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<P><HR><P>
|
||||
This document was generated on 19 November 2002 using
|
||||
<A HREF="http://wwwinfo.cern.ch/dis/texi2html/">texi2html</A> 1.56k.
|
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</BODY>
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</HTML>
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@ -1,18 +1,30 @@
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The FFserver streaming HOWTO
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----------------------------
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\input texinfo @c -*- texinfo -*-
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|
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Philip Gladstone <philip-ffserver@gladstonefamily.net>
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Last updated: July 26, 2002
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@settitle FFserver Documentation
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@titlepage
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@sp 7
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@center @titlefont{FFserver Documentation}
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@sp 3
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@end titlepage
|
||||
|
||||
0. What is this HOWTO about?
|
||||
|
||||
This covers only the streaming aspects of ffserver / ffmpeg. All questions about
|
||||
parameters for ffmpeg, codec questions, etc. are not covered here.
|
||||
@chapter Introduction
|
||||
|
||||
You should also read the ffserver.txt file in this directory. It contains
|
||||
roughly the same information.
|
||||
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 in ffserver.conf).
|
||||
|
||||
1. What can this do?
|
||||
This documentation covers only the streaming aspects of ffserver /
|
||||
ffmpeg. All questions about parameters for ffmpeg, codec questions,
|
||||
etc. are not covered here. Read @file{ffmpeg-doc.[texi|html]} for more
|
||||
information.
|
||||
|
||||
@chapter QuickStart
|
||||
|
||||
[Contributed by Philip Gladstone, philip-ffserver at gladstonefamily dot net]
|
||||
|
||||
@section 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
|
||||
@ -21,7 +33,7 @@ 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.
|
||||
|
||||
2. What do I need?
|
||||
@section What do I need?
|
||||
|
||||
I use Linux on a 900MHz Duron with a cheapo Bt848 based TV capture card. I'm
|
||||
using stock linux 2.4.17 with the stock drivers. [Actually that isn't true,
|
||||
@ -29,7 +41,7 @@ I needed some special drivers from my motherboard based sound card.]
|
||||
|
||||
I understand that FreeBSD systems work just fine as well.
|
||||
|
||||
3. How do I make it work?
|
||||
@section 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-mp3lame
|
||||
@ -40,28 +52,32 @@ ask why the other audio types do not work.
|
||||
|
||||
As a simple test, just run the following two command lines:
|
||||
|
||||
@example
|
||||
./ffserver -f doc/ffserver.conf &
|
||||
./ffmpeg http://localhost:8090/feed1.ffm
|
||||
@end example
|
||||
|
||||
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
|
||||
|
||||
@example
|
||||
http://<linuxbox>:8090/test.asf
|
||||
@end example
|
||||
|
||||
You should see (after a short delay) 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.
|
||||
|
||||
4. What happens next?
|
||||
@section 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.
|
||||
|
||||
5. Troubleshooting
|
||||
@section Troubleshooting
|
||||
|
||||
* I don't hear any audio, but video is fine
|
||||
@subsection I don't hear any audio, but video is fine
|
||||
|
||||
Maybe you didn't install LAME, or get your ./configure statement right. Check
|
||||
the ffmpeg output to see if a line referring to mp3 is present. If not, then
|
||||
@ -72,15 +88,15 @@ 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 loose sync after a while.
|
||||
@subsection The audio and video loose sync after a while.
|
||||
|
||||
Yes, they do.
|
||||
|
||||
* After a long while, the video update rate goes way down in WMP.
|
||||
@subsection 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.
|
||||
@subsection 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
|
||||
@ -88,7 +104,7 @@ different object ids that you can use, one of them -- the old one -- cannot
|
||||
play very well, and the new one works well (both on the same system). However,
|
||||
I suspect that the new one is not available unless you have installed WMP 7].
|
||||
|
||||
6. What else can it do?
|
||||
@section What else can it do?
|
||||
|
||||
There seems to be a bunch of code that allows you to replay previous
|
||||
video. I've never tried it, so it probably doesn't work properly. YMMV.
|
||||
@ -108,7 +124,7 @@ 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.]
|
||||
|
||||
7. Tips
|
||||
@section 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
|
||||
@ -129,7 +145,7 @@ 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.
|
||||
|
||||
8. Why does the ?buffer / Preroll stop working after a time?
|
||||
@section 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
|
||||
@ -140,22 +156,26 @@ or more seconds behind, there is no preroll left.
|
||||
Fixing this requires a require in the internals in how timestampts are
|
||||
handled.
|
||||
|
||||
9. Does the ?date= stuff work.
|
||||
@section Does the @code{?date=} stuff work.
|
||||
|
||||
Yes (subject to the caution above). Also note that whenever you start
|
||||
ffserver, it deletes the ffm file, thus wiping out what you had recorded
|
||||
before. This behaviour is a temporary fix to various crashes. The aim is
|
||||
to fix it so that the old data is saved if possible.
|
||||
|
||||
The format of the ?date=xxxxxx is fairly flexible. You should use one
|
||||
The format of the @code{?date=xxxxxx} is fairly flexible. You should use one
|
||||
of the following formats (the 'T' is literal):
|
||||
|
||||
@example
|
||||
* YYYY-MM-DDTHH:MM:SS (localtime)
|
||||
* YYYY-MM-DDTHH:MM:SSZ (UTC)
|
||||
@end example
|
||||
|
||||
You can omit the YYYY-MM-DD, and then it refers to the current day. However
|
||||
note that ?date=16:00:00 refers to 4PM on the current day -- this may be
|
||||
note that @samp{?date=16:00:00} refers to 4PM on the current day -- this may be
|
||||
in the future and so unlikely to 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
|
||||
For example: @samp{http://localhost:8080/test.asf?date=2002-07-26T23:05:00}.
|
||||
|
||||
@bye
|
||||
@ -1,79 +0,0 @@
|
||||
*************** FFserver live broadcast server *****************
|
||||
|
||||
0) Introduction
|
||||
|
||||
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 in ffserver.conf).
|
||||
|
||||
1) Quick help
|
||||
|
||||
- First you must ensure that your grab system is OK. Verify with
|
||||
'xawtv' that your TV card is tuned on a correct video source.
|
||||
|
||||
- Try with ffmpeg that you can record correctly. For example:
|
||||
|
||||
ffmpeg /tmp/a.mpg
|
||||
|
||||
will record a ten seconds mpeg file from your TV card and audio
|
||||
card. Use for example the mpegtv player or MPlayer to view the created
|
||||
MPEG file.
|
||||
|
||||
- Launch ffserver on your PC with the sample config file:
|
||||
|
||||
ffserver -f doc/ffserver.conf
|
||||
|
||||
- Verify with your browser that ffserver is working correctly. For
|
||||
that purpose, explore: http://localhost:8090/stat.html .
|
||||
|
||||
- Now launch ffmpeg to do real time encoding :
|
||||
|
||||
ffmpeg http://localhost:8090/feed1.ffm
|
||||
|
||||
- Then, use your favorite players to see each generated stream:
|
||||
|
||||
mtvp http://localhost:8090/test1.mpg
|
||||
|
||||
mpg123 http://localhost:8090/test.mp2
|
||||
|
||||
netscape http://localhost:8090/test.swf
|
||||
|
||||
realplayer http://localhost:8090/test.rm
|
||||
|
||||
etc...
|
||||
|
||||
Note that ffserver generates multiple streams in multiple formats AT
|
||||
THE SAME TIME. It should be able to handle hundreds of users at the
|
||||
same time if you internet connection is fast enough.
|
||||
|
||||
- Now you can configure ffserver for your real needs. Edit the
|
||||
ffserver.conf file to use only the formats you want. Read the ffmpeg
|
||||
documentation (ffmpeg.txt) to learn more about the codec and format
|
||||
stuff.
|
||||
|
||||
- Report any bug you find (and the fix if you have it!).
|
||||
|
||||
2) URL Format
|
||||
|
||||
ffserver supports that you seek in some formats. The syntax is to
|
||||
add a '?' option to the URL. Only the 'date' option is supported.
|
||||
|
||||
The date format is [YYYY-MM-DDT][[HH:]MM:]SS[.m...] (clost to ISO
|
||||
date format). For live streams, the date is absolute and give in
|
||||
GMT. If the day is not specified, the current day is used.
|
||||
|
||||
example:
|
||||
|
||||
mpg123 http://localhost:8090/test.mp2?date=10:00
|
||||
|
||||
play the stream starting at 10:00 AM GMT today.
|
||||
|
||||
mpg123 http://localhost:8090/test.mp2?date=2001-06-23T23:00
|
||||
|
||||
is also a valid date.
|
||||
|
||||
For file streams, the date is relative to the start of the file. No
|
||||
day can be specified.
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user