All things related to multicast

["Richard Mavrogeanes" <>]

Frank,
 
MPEG-4 part 10 delivery is the same as MPEG-4 part 2 delivery:  RTP via RTSP 
or via multicast/SDP.  It means you can use any player or STB that supports 
standards (ISMA 2.0). Players include QuickTime player, VLC, etc.  Transport 
Stream is what carriers use for "IPTV" to leverage their previous investment 
in TS muxes, etc.  Ultimately, we'll support TS too so that certain 
consume-class "IPTV" devices can be provisioned.
 
QT has some advantages, as it will support the mandatory Closed Caption 
(mandatory per ADA and US Sec. 508), while VLC does not as far as I am aware 
(although CC is not in our very first firmware release).  More importantly, 
QT player has the mandatory royalty for decoding both the video (MPEGLA) and 
the AAC audio (Dolby-spinout Via) paid while VLC remains illegal to use at 
least in the United States (again, I have no axe to grind here...I frankly 
don't care what someone uses to receive and decode our audio/video as long as 
they are happy...but I do want our customers to be safe).
 
Everyone will have lots of opportunity to play with the live 7x24 HD and SD 
broadcasts I'll have up soon.  In addition to advertising the stream via SAP, 
I'll point you to the automatic SDP file generated and hosted by the device 
which you access via HTTP.  I'll also provide RTSP address for those unable 
to join the multicast...a problem that continues to plague desktops in 
virtually every institution I visit (does Connecticut College allow multicast 
to reach every desktop?)
 
/rich
 
Rich Mavrogeanes
Founder, CTO, GM-VBoss
VBrick Systems, Inc.
12 Beaumont Road
Wallingford CT 06492 USA
+1 203.303.0200 office
+1 203.623-1698 mobile
http://www.vbrick.com <http://www.vbrick.com/> 
http://www.vbrick.net/vbbb
Building Vision Across Your Network

________________________________

From: Frank Fulchiero 
[mailto:]
Sent: Thu 6/12/2008 3:37 PM
To: Richard Mavrogeanes
Cc: wg-multicast
Subject: Re: SAPs for H.264 RTSP streams



Hi Richard, thanks for the answer...
Sorry I inadvertedly 'hijacked' the thread, I changed the topic...
Will your SAPs work with RTSP encapsulated streams, or just transport 
streams?

Frank


On Jun 12, 2008, at 3:29 PM, Richard Mavrogeanes wrote:

> That VLC can support, maybe.  But our multicast H264 includes 
> compliant
> SAP's.
>
> I will have both SD and HD multicast H264 on the I2 in the next few
> weeks for you to enjoy (find it via SAP).
>
> /rich
>
>
> -----Original Message-----
> From: Frank Fulchiero 
> [mailto:]
> Sent: Thursday, June 12, 2008 3:20 PM
> To: wg-multicast
> Subject: Re: Another SAP Storm?
>
> As the topic of SAPs has come up, does anyone know if it's
> theoretically possible to generate SAPs for multicast RTSP H.264
> streams, that VLC can detect?
>
> I know it's possible for H.264 transport streams, as we see ours in
> VLC, under Connecticut College H.264, from our Visionary Solutions
> encoder.
> Quality is not great, as we jury-rigged input.
>
> Thanking anyone for an answer.
>
> Frank Fulchiero
> Digital Media Specialist
> Connecticut College
>