[Mp4-tech] Video - Tiling multiple video streams

[Raghuram V Pidaparthi]

Boris, Can you suggest me some authoring tools with which this can be 
accomplished. Also, the number of connections the server could handle is 
really limited because of the number of streaming connections that the 
server has to handle and the incoming/outgoing bandwidth. So, can the 
tools really operate in real-time while handling multiple streams?
Thanks
Raghu 
On Sun, 1 Aug 2023 bfelts envivio.com wrote:
> There are some other -and maybe easier- ways to do this and use the object 
> approach of MPEG-4, using MPEG-4 System .
> You can easily create a scene, or MPEG-4 system presentation, with multiple 
> video placeholders referring to the live incoming streams.
> I don't think you have to change the nature of the incoming streams or use 
> sophisticated transcoding algorithm for the application you describe (and I 
> don't believe there is any commercial implementation of MPEG-4 part II video 
> core profile using the video object, but there are quite a few MPEG-4 system 
> authoring tools and players) With the appropriate tools, it takes maybe few 
> minutes to accomplish that.
> 
> Hope that helps,
> 
> Boris Felts
> Envivio
> 
> > Dear Raghuram, 
> > 
> > It seems to be possible in two ways, 
> > 1. transcoding of various incoming stream into one stream. This is
> > applicable for most standards which are block-based (like. MPEG2,
> > H.263,H.264 etc.)  Here streams are essentially decoded (partially or
> > compeletely depending on need of the input and output formats). Also
> > it implies computation at some central node. Most ideas on transcoding
> > are derived from the seminal work described here which can serve for
> > you as a good starting point.
> > 
> > * Shih-Fu Chang; Messerschmitt, D.G. "Manipulation and compositing of
> > MC-DCT compressed video" Selected Areas in Communications, IEEE
> > Journal on  ,Volume: 13 , Issue: 1 , Jan. 1995 Pages:1 - 11
> > 
> > 2. use of object based encoding as supported by MPEG 4 (core
> > profiles). MPEG-4 object based encoding facilitates coding of various
> > object (they can be rectagular or artbitrary shaped) to be combined in
> > a single bitstream. This would mean that at the mixing junction,
> > different streams need to be approriately interleaved and at the
> > player should be equipped with decoding the video of more than one
> > video object. In MPEG-4, there are also profiles of synthetic and
> > natural videos and whole lot of combination can be packed togather in
> > a single MPEG-4 stream.
> > 
> > You may refer to :
> > * Touradj Ebrahimi, Caspar Horne "MPEG-4 natural video coding - An
> > overview", Signal Processing: Image Communication 15 (2000) 365-385.
> > 
> > * MPEG-4 - Multimedia for our time IEEE Spectrum, Nov 99.
> >    available at http://www.m4if.org/resources/IEEESpectrum/mp4ieee.htm
> > 
> > * Overview of the MPEG-4 Standard
> >   available at :
> > http://www.chiariglione.org/mpeg/standards/mpeg-4/mpeg-4.htm
> > 
> > * http://www.m4if.org/tutorials.php
> > 
> > Hope this helps.
> > 
> > Dipan Mehta
> > 
> > On Mon, 26 Jul 2023 12:58:17 -0600 (MDT), Raghuram V Pidaparthi
> > <raghuram unm.edu> wrote:
> > > Hi,
> > > I am new to multimedia streaming applications. I want to
> > > implement a project :
> > > I want to tile multiple streams in a server received from different
> > > systems on a  network into a single composite frame in real-time and stream
> > the
> > > resulting composite stream for a video-conferencing application. Is there
> > > anyway I can do this using MPEG-4. Can someone give me some leads.
> > > Thank you
> > > Raghu
> > > 
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