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Re: Problems Streaming on All Ports

Bruce:

First thing I would try is streaming locally from a client connected to the same hub/switch as the server. If this works, the server is functioning.

You might want to try specifying the port number(s) when clients connect:
rtsp://<your server>:554/<your media>
rtsp://<your server>:80/<your media>

By default, the streaming server will attempt to stream at up to 2x the bit rate of the media. You 300kb sample movie will more than saturate your DSL uplink speed. Connecting to a 100kb stream from a 56kb modem won't work no matter what you do ;-)

Many ISPs block traffic (to prevent people from hosting their own servers on non-commercial connections). This is particularly true for http port 80. You could try running a web server and see if clients can access that. If they can't connect via a browser, chances are your ISP is blocking that traffic: To host a server, they want you to ante up for a commercial account. In any case, with an uplink speed of 484kb, your ability to host will be extremely limited at best. DSL is bursty, which makes it less than ideal for hosting as well.

For streaming on the Internet it is highly recommended that you have a "real" Internet IP address (streaming from behind a NAT is tricky at best). It is also recommended that you have a commercial grade connection with consistent bandwidth available (i.e. not a bursty adsl connection).

A very affordable way to get these is via a shared hosting service (this will cost less than a dedicated commercial grade Internet connection). Many web hosting vendors provide streaming services as well. Alternatively, you can use a commercial grade Internet connection that provides support for real Internet IP addresses, and guaranteed minimum bandwidth available.

Hope this helps,

-George

On Mar 31, 2005, at 9:25 AM, Bruce Perryman wrote:

Hi,

Initially I downloaded the binary for RedHat Linux
from Apple's website and installed it on RedHat 9.
I've had no problem streaming on my internal network,
but I've had trouble from a remote client to my
server.

I had problems with streaming tests of the 100 and
300kbit mp4 samples using RTSP. I was told of the
problems streaming behind NAT firewalls and making
sure that the appropriate ports were open.

I have since tried opening all the ports listed on the
following websites and in the admin guide.
(Thank you George Cook)

For reference:
http://docs.info.apple.com/article.html?artnum=106307
http://manuals.info.apple.com/en/quicktime/QTSSAdminGuide.pdf
http://www.soundscreen.com/streaming/firewall.html
http://soundscreen.com/downloads/RTP_RTSP_Negotiation_Ports.pdf
(see
Appendix B for useful port information)

That produced little improvement, but I still was
unable to see the complete stream and hear the
complete sound.
I then connected my streaming server system directly
to my DSL modem bypassing the NAT router and all
firewalls on the server side. This showed a little
more improvement, but still I was unable to see and
hear the full stream.

Lastly, I tried streaming on port 80. Using the admin
interface, I changed the streaming option and
restarted the server. This I did both behind my NAT
router with the streaming server as a DMZ host and
directly connected to my DSL modem. Both tests yielded
a connection but no complete stream. About 500k were
being sent of the 100kbit.mp4 then it appeared to hang
on the client side. The clients were a 56k dial-up and
a cable modem connected around 3 Meg/sec. Both clients
tested with their firewalls on and off with no
difference. The clients tried a connection with rtsp
and http to see if there was any change. Their
streaming preferences were set for Quick Time to
choose the best port.

What am I doing wrong? I really would like to use DSS
for streaming.
Is there a minimum system requirement? The server is
running on a P 233Mhz with 384M RAM on a DSL
connection with 1.7/484 bitrates down/up respectively.
Could my DSL connection be jiving me? Does DSS
document errors in logs in detail to show what
occurred?
Is there a small sample that I can test from a 56K
client over port 80 that shows the minimum
functionality?

Please help. George, if you are listening, I'd
appreciate any insight that you can give. I've
abandoned, for now, building the latest source on
Fedora Core 3 because of build problems.

Thanks a lot.

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 >Problems Streaming on All Ports (From: Bruce Perryman <email@hidden>)



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