ITVLP - Internet TeleVision Linking Project
ITVLP was a project to attempt to link ATV repeaters using
the internet. Most of this information is out of date, and the move from
Analogue TV to Digital TV changes the approach that should be taken.
There is a Yahoo group set up for the ITVLP project run by John KD5INM :
On the 9th August 2001 Tony VK3JED
gave a talk
at the NERGs on IRLP which he was running on VK3RGL from time to time. I was curious to
see if the idea could be extended to include video conferencing on the local amateur television repeater
This page is a collection of notes and links to explore
the possibility of putting together a Internet TV Linking Project. The
project never really took off dure to lack of time to work
The idea is basically to have a video conferencing package
that listens to the output of an ATV repeater using say a TV Tuner / Video capture card with low noise
pre-amp, and use a video card on the computer with TV output to transmit pictures to the ATV repeater
input. In this way radio amateurs with TV stations in different countries can video conference
across the internet and the general amateur radio operator with ATV receivers could watch the output of the
ATV repeater. As now, amateurs could conduct a voice link with the ATV operator via IRLP. They don't
need to have an ATV transmitter to talk with someone who does.
There is already significant use of computers with TV out
video cards for generating graphics test patterns on ATV. TV transmitter kits are readily available in Australia
from places like
Mini - Kits.
Video Conferencing Packages for Linux
Cornell University have released a video conferencing
package called qVIX/CU30 for Linux. It is available from source forge at:
Another interesting site for Linux video conferencing
is the openH323.org site where they are trying to develop an open Video conferencing standard.
A brief over view of both qVIX/CU30 and H323 is available
KDE video conferenceing based on Open H.323
Video Conferencing for the Gnome Desktop Environment. (Open
Multicast video conferencing and conference management
Networking the Internet
The approach taken by the
group is to use Linux as the internet hub running the IRLP
following site should tell you how to hook up
a fast internet connection to Linux and share the connection
with a network of computers:
Linux IP Masquerading
Bt848 Based Capture Cards for Linux
Linux supports a number of video capture cards but the
cheapest are based on the Brooktree Bt848 such as the FlyVideo and Miro PCTV tuner cards.
Video4Linux is a mailing list and web site for video
capture drivers for linux. It also has a number of drivers for the Bt848 based cards as well as a number
of other Video Capture/ TV Tuner cards.
Video 4 Linux
Frame Grabber Drivers for Linux
Video Display cards with TV out
In terms of video cards with TV Output, the following article suggests
the ATI Rage cards are best for broadcast video and that the nVidia
GeForce and TNT2 cards need scan convertors and genlocks for SCALA applications.
They also say the ATI Rage family is near the end of it life cycle.
The ATI All-In-Wonder sounds like a pretty nifty card. It combines
Graphics TV output with TV tuner input and is available in AGP or PCI.
The PRO version appears to have been released in 1998 or there abouts
The ATI All-In-Wonder 128 appears to be an upgrade and seems to includeMPEG1
and MPEG2 compression. Full motion MPEG2 needs a Pentium 3 to operate
on the 128. For a 200MHz MMX Pentium, as I propose using MPEG1 at 352
x 240 seems to be the best you can do. I can already handle MPEG 1 with
the Pinnacle systems Studio MP10 box that plugs onto the printer port and
provides PAL input and output. The Studio MP10 is no longer supported by
Pinnacle Systems and there does not appear to be any information on using
the MP10 with Linux.
Display/Tuner/Capture Card supported by Video4Linux
ATI All-In-Wonder Capture / Display Card Linux Drivers
nVidia GeForce II
TV out drivers for Linux
Pinnacle Systems MP10.
This page has an interesting table that says that maximum
image quality for a 352 x 240 pixel NTSC MPEG 1 is 3 Mbps, good quality
2400 Kbps, and so on trading off bandwidth for image quality. The slowest
setting supported on the MP10 is 176 x 112 pixels (presumably at a 30cps
frame rate) with a band width of 256Kbps.
I am not sure about the price and availability of these cards. The
All-In-Wonder PRO appears to be supported by Xfree86 but I am not sure
about the newer 128 based on the RAGE accelerator chip.
Simple Directmedia Layer Library
Tony suggest that X windows is probably not the way to go for optimum
speed maybe some Multimedia interface like SDLlib may suport. Simple DirectMedia
Layer Library is an interface for a variety of Media devices for Linux.
I am not sure if it supports Video capture cards, but I think it must if
it is serious. It looks like this package runs on Linux, BeOS, Windows and
Macs which is good for cross platform support.
Other Odds and Ends
Here are some other Links that may be of interest:
Multimedia 4 Linux