First of all, can AVI even be streamed? I'm not sure, but I don't think
it can. Even if you can, I would recommend using a saner format.
Secondly, your ffmpeg config is incomplete. When streaming with ffserver
you only need as many params as are required for the input. All output
params are done in the conf file.
So you only need:
*ffmpeg -f x11grab -r 3 -i 0:0 http://localhost:8090/screencast.ffm*
* <http://localhost:8090/screencast.ffm>*
The rest goes in your ffserver.conf
If it's a screencast, and you don't need audio, you can add NoAudio just
below AudioSampleRate and it will override your audio settings, removing
the audio stream, saving you the bandwidth.
I am working on a good ffserver.conf for the current build of
ffmpeg/ffserver once done I will post it here. At the moment, my
ffserver.conf does not seem to work properly with the current build of
ffserver.
Finally, I would recommend switching to a format more suitable to
streaming. For high res streaming over a local network I would recommend
mpeg2ts at about 1.5mbits or if you need lower bandwidth, h.264 in flv
at about 400kbits. These should be fine for screencasting 3fps at
1024x768. That being said, I'd recommend using a higher framerate. Going
to say 8fps would give you a far more fluid screencast, and should still
be fine for the bitrates I've recommended here.
avinash p.v wrote:
Dear All,
I am a Student working on a Project in which I need to Stream my
Desktop Live to another System over a wireless Network. I am stuck
very badly, any help will be greatly appreciated.
*I am able to grab the Screen successfully* with the following command:
$ ./ffmpeg -f x11grab -r 24 -s 1024x720 -i :0.0 out.mpg
OR even better quality by
$ ffmpeg -an -f x11grab -r 25 -s 1024x768 -i ":0.0" -vcodec mpeg4
-sameq /tmp/bla.mp4
Then I am trying to stream this to the ffserver with the following
command ; and I have* hit a road block*.*
$ ffmpeg -f x11grab -r 3 -b 64 -g 12 -s 1024x720 -i :0.0
http://localhost:8090/screencast.ffm*
FFmpeg version SVN-r20911, Copyright (c) 2000-2009 Fabrice Bellard, et al.
built on Dec 24 2009 10:42:59 with gcc 4.3.3
configuration: --enable-gpl --enable-version3 --enable-nonfree
--enable-pthreads --enable-libfaac --enable-libfaad
--enable-libmp3lame --enable-libxvid --enable-x11grab
libavutil 50. 7. 0 / 50. 7. 0
libavcodec 52.43. 0 / 52.43. 0
libavformat 52.44. 0 / 52.44. 0
libavdevice 52. 2. 0 / 52. 2. 0
libswscale 0. 7. 2 / 0. 7. 2
WARNING: The bitrate parameter is set too low. It takes bits/s as
argument, not kbits/s
[x11grab @ 0x8c7a390]device: :0.0 -> display: :0.0 x: 0 y: 0 width:
1024 height: 720
[x11grab @ 0x8c7a390]shared memory extension found
[x11grab @ 0x8c7a390]MAX_READ_SIZE:5000000 reached
[x11grab @ 0x8c7a390]Estimating duration from bitrate, this may be
inaccurate
Input #0, x11grab, from ':0.0':
Duration: N/A, start: 1265699007.493820, bitrate: 70778 kb/s
Stream #0.0: Video: rawvideo, bgra, 1024x720, 70778 kb/s, 3 tbr,
1000k tbn, 3 tbc
[mpeg4 @ 0x8c8b7c0]bitrate tolerance too small for bitrate
Output #0, ffm, to 'http://localhost:8090/screencast.ffm':
Stream #0.0: Video: mpeg4, yuv420p, 1360x768, q=3-31, 64 kb/s,
1000k tbn, 3 tbc
Stream mapping:
Stream #0.0 -> #0.0
Error while opening encoder for output stream #0.0 - maybe incorrect
parameters such as bit_rate, rate, width or height
*
My ffserver.conf file is :*
Port 8090
BindAddress 0.0.0.0
MaxClients 1000
MaxBandwidth 1000
NoDaemon
<Feed screencast.ffm>
File /tmp/screencast.ffm
FileMaxSize 10M
ACL allow 127.0.0.1
</Feed>
<Stream screencast.avi>
Feed screencast.ffm
Format avi
AudioBitRate 32
AudioChannels 1
AudioSampleRate 22050
VideoBitRate 64
VideoBufferSize 40
VideoFrameRate 3
VideoSize 1024x720
VideoGopSize 12
NoAudio
</Stream>
<Stream stat.html>
Format status
ACL allow localhost
ACL allow 192.168.0.0 192.168.255.255
</Stream>
<Redirect index.html>
URL http://www.ffmpeg.org/
</Redirect>
So, please help me by answering these qustions:
1. *Am I heading in the right direction at all. Is it achievable
from FFMPEG? I did'nt find much help online related to live
streaming.
*
2. *If so, what are the changes i need to make either in the cofig
file or in the command.. or is there any other way.
*
3. *Please suggest me some documentation [tutorials] with which i
could work better.*
Thanks & Regards
Avinash P V
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