Hi,
today, i've been trying sucessfully a first link :
webcam plugged on a server (ubuntu-server 10.04 LTS). / 1 customer
windows XP using VLC
I had many difficulties to obtain the stream on VLC.
in many other configurations, ffmpeg was freezing after a while, for
example using mpeg2 and mpeg4 codecs
Also ogg format did not give me good results.
Finally I could only get it working using :
format = swf
videocodec = flv
(no audio used at this moment).
pictures are 352x288 15fps
bandwidth used 150Kbits-500Kbits (depending of the content of the movie)
ffmpeg is succesfully launched from ffserver
ffmpeg -s cif -f video4linux2 -i /dev/video0 -r 14 -g 10 -vcodec flv
I can see a delay of approx. 6-7 sec between an action and seeing the
result on the screen.
So my question is :
is it possible to reduce this delay ?
ffmpeg is making and encoding...
... but I wonder if ffserver is (also) making another
decoding/re-encoding ? This could be a reason of soo much delay (because
of the GOP).
So I wonder if I could reduce this delay by passing raw images from
ffmpeg to ffserver ?
(for the moment I try it , unsuccessfully)
Or is just ffserver streaming exactly what it receives ? So what is the
reason to declare to (video/audio)codecs in ffserver conf-file ?
best regards,
Le 08/03/2012 11:30, nandan amar a écrit :
On Thu, Mar 8, 2012 at 3:50 PM, informatique lycee Pays-de-Retz
<adminrezo.04419...@ac-nantes.fr
<mailto:adminrezo.04419...@ac-nantes.fr>> wrote:
hello,
I am looking for a technical solution to make live video-streaming to
many users (almost) simultaneously
Because of the risk of traffic-jam on the connexion-link of the
server,
my idea so solve this risk is to create a cascaded architecture :
- 1 video-station is sending initial stream to 1 top-level-server
- 10-30 2nd-level servers get the stream from the top-level server :
act as relay-server
- 20-50 3rd-level servers receive the stream from every second-level
server (this makes 30 x 50 = 1500 servers) : act as relay-server
- customers are on the 4rth level : about 100 customers per
3rd-level server
second-level and third-level servers are on ADSL connexions
so I have 3 questions :
1) level 1 : do ffmpeg and ffserver necessary have to be on the same
computer ? or is it possible to put a network-link between those 2
applications ?
Yes This is possible.
You can feed video stream to ffserver as :
ffmpeg -i <input_video_file>
http://<server_address>:<port_no_where_server_is_listening>/<file.ffm>
2) level 2 and 3 : is it possible to build this cascade architecture
with ffmpeg and ffserver ? that means create relay-servers based on
ffmpeg and ffserver ?
This looks like bit difficult and may not be possible as ffserver
needs feed in advance.
So cascading may work but delay may be an issue.
3) what is the best and reliable encoding for this (video 352x288
10-15fps + audio 10 kHz) ?
Thanks for any technical help
what is your streaming media type.
If it is normal movie 25 fps sud work and CIF (352x288) for not so
great as HD kind of quality.
--
Xavier COUDIN - coordinateur informatique
Lycée Pays-de-Retz, 44210 Pornic, gsm 06 80 28 40 53
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--
Amar Kumar Nandan
Karnataka, India, 560100
☎:+91-9019054471
✉:nandan.a...@gmail.com <mailto:nandan.a...@gmail.com>
http://aknandan.co.nr
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--
Xavier COUDIN - coordinateur informatique
Lycée "Pays-de-Retz"
1 pl Joseph Girard 44210 PORNIC
tel 02 40 82 40 19 poste 167
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