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Re: SDP Problem during Multicast

Zhigao:

Exactly, the mismatch problem turns out to be due to the mp4 file I used. I
can successfully create a playlist using the sample movies (the movie only
shows a rolling QuickTime logo, right?) and get it playing. I can also do
multicast streaming with the relay running, though no connected relay is
shown in the web admin page (DSS bug?).

You won't see connected users to a multicast. The streaming server sends packets to the multicast address, and clients tune in on the multicast in progress. There is no way for the streaming server to know who's tuned in. All clients are tuning in on the same packet stream with multicast. With unicast each client makes a separate connection to the server, so it can track concurrent users.

I downloaded the Towers.mp4 file from a movie website at
http://www.archive.org/movies/movies.php. I can stream this video using the
gmp4player of the MPEG4IP (I use this player because QuickTime 6 does not
have a Linux version), but it seems DSS is not happy with it. I guess the
video is lack of hint info required by DSS. If you happen to know how to add
the hint, please let me know.

That's good to know. There have been some threads on the list on using open source tools to compress/hint mpeg-4. I'm not an expert in this area. With QuickTime Player and a QuickTime Pro license you could export "Movie to MPEG-4", set the video and audio tracks to "pass through" and add a hint track. Or you could "Export Movie to Hinted Movie" which will create a QuickTime .mov file with the mpeg-4 a/v tracks and a QuickTime hint track.

-George

-----Original Message-----
From: George Cook [mailto:email@hidden]
Sent: Wednesday, January 26, 2005 12:50 PM
To: Chen Zhigao
Subject: Re: SDP Problem during Multicast

Zhigao:

The sdp file looks OK.

To eliminate the possibility that PlaylistBroadcaster isn't able to parse
the mpeg-4 file, could you try to create a playlist with one of the sample
movies installed with the server? If you don't have those, I can send a
small sample movie that I've tested. If that works, could you provide more
info on how you created your mpeg-4 file? Perhaps PlaylistBroadcaster is
generating incorrect sdp information.

-George

On Jan 25, 2005, at 11:05 PM, Chen Zhigao wrote:

Hi George,

Thank you very much for the reply. The SDP file generated after the
web admin created the playlist is stored at
/var/streaming/playlists/myplaylistname. Since the web admin complains
the SDP mismatch, I wasn't able to use the generated broadcast
description file to generate a SDP file.

Attached pls find the SDP file generated by the web admin. Look
forward to your comments.

Best regards,
Zhigao


-----Original Message-----
From: George Cook [mailto:email@hidden]
Sent: Wednesday, January 26, 2005 11:47 AM
To: Chen Zhigao
Subject: Re: SDP Problem during Multicast

Zhigao:

I can successfully stream the mp4 file on demand in unicast. 

That's a step in the right direction!

But I was not able to get through the playlist broadcast using SDP
(there is actually only one video in my playlist). I've described how
I created the playlist using the web admin in my previous email. The
playlist, though seemingly simple, can not be started. It would be
great if you can help me point out what's wrong.


I can't replicate this. Can you send me the sdp file that is being
created by PlaylistBroadcaster? Normally the sdp file generated by the
web gui will be placed in the movies directory, but it appears that it
is being placed in the directory with the playlist config files (odd).

For 3, I can create and run a relay. However, it is not shown in the
"Relay Status" page of the web admin. I guess it is because of the
step 2 in which I haven't get the playlist broadcast up and running.


That's right. You've got to have the playlist running for the relay to
be active.

--

Nothing in the world can take place of persistence.
Talent will not; nothing is more common than unsuccessful men with
talent.
Genius will not; unrewarded genius is almost a proverb.
Education will not; the world is full of educated derelicts.
Persistence and determination alone are omnipotent.
 
~ Calvin Coolidge


<untitled.sdp> 
--

Nothing in the world can take place of persistence.
Talent will not; nothing is more common than unsuccessful men with talent.
Genius will not; unrewarded genius is almost a proverb.
Education will not; the world is full of educated derelicts.
Persistence and determination alone are omnipotent.
 
~ Calvin Coolidge





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