Many standards and draft recommendations (including H.261, H.263,
H.320, H.324), are available in http://www.imtc.org/imtc/

The H.261 spec is available in
ftp://ftp.fdn.org/pub/Library/Ccitt-standards/ccitt/1992/h/h261.doc.z

For H.261 hardware, see item 85 in part 3 of this FAQ.

Current drafts of H.324 and related recommendations including H.263 are
available in ftp://ftp.std.com/vendors/PictureTel/h324/

Telenor Research have made available a complete simulation of
H.263. See http://www.nta.no/brukere/DVC/h263_software

An H.263 encoder library is available at http://huizen.dds.nl/~roalt/h263.html


from Thierry TURLETTI <turletti@sophia.inria.fr>:

     IVS (INRIA VIDEOCONFERENCING SYSTEM)
      - X11-based videoconferencing tool for SPARC, HP,  DEC  and
     Silicon Graphic workstations.

     ivs allows users  to  conduct  multi-host  audio  and  video
     conferences  over  the  Internet. ivs requires a workstation
     with a screen with 1, 4, 8 or  24  bits  depth.   Multi-host
     conferences  require  that  the  kernel support multicast IP
     extensions (RFC 1112).

     On video input, video frames are grabbed  by  the  VideoPix,
     SunVideo or Parallax boards for SparcStations or Raster Rops
     board for HP stations or the IndigoVideo board for SGI  IRIS
     Indigo workstations.  or the VIDEOTX board for DEC stations.
     No special hardware apart from  the  workstation's  build-in
     audio hardware is required for audio conference.

     Video encoding is done according to the H.261 standard.
     The video stream can be encoded in either Super CIF 
     (704x576 pixels) format or  CIF  (352x288  pixels) format or 
     QCIF (176x144 pixels). Default format is CIF.

     Sources, binaries & manuals are freely available by anonymous 
     ftp from zenon.inria.fr in the rodeo/ivs directory. An INRIA
     report describing this application is also available in the 
     same directory.

     If you ftp & use this package, please send all remarks or 
     modifications made to <turletti@sophia.inria.fr>. If you want 
     to be added or deleted to the ivs-users mailing list, please send 
     e-mail to ivs-users-request@sophia.inria.fr.


from Andy Hung <achung@cs.stanford.edu>:

Public domain UNIX C source code to do both image and image sequence
compression and decompression is available by anonymous ftp:

MPEG-I			ftp://havefun.stanford.edu/pub/mpeg/
CCITT H.261(P*64)	ftp://havefun.stanford.edu/pub/p64/P64v*.tar.Z
JPEG			ftp://havefun.stanford.edu/pub/jpeg/JPEGv*.tar.Z

These codecs operate on raw raster scanned images.

A software program to display raw raster-scanned YUV images and image
sequences on X grayscale or color monitors is provided by a program in
ftp://havefun.stanford.edu/pub/cv/CVv*.tar.Z
If you are using the codecs above, we recommend that you ftp this file
over as well.

The source code has been compiled on DEC and SUN workstations.
Caution: the P64 codec has not been tested compliant (any available
p64 video streams would be much appreciated - please let us know at
achung@cs.stanford.edu).  The other codecs have been tested with
streams from other encoders.

We also have some IPB MPEG-I video coded streams in pub/mpeg/*.mpg;
and P64 video streams in pub/p64/*.p64 that we have generated using
our codecs.

For a more complete description see the file
havefun.stanford.edu:pub/README.

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