|DVB-S Transmitter Application|
I would give you all a preview of the program I am currently working on.
It looks simple but a lot of work has gone into this. What is it you ask?
Well it is a Windows based program that can capture video/audio from a source,
compress it using the FFMPEG codec libraries, turn it into a valid MPEG2
Transport Stream and then send it to the DATV-Express board where it is
turned into DVB-S by the FPGA and then transmitted.
Currently it supports H.262 (MPEG 2), H.264 (MPEG4-AVC / MPEG4 part 10 )
and H.265 HEVC. At the moment it only supports MPEG1 Layer II sound although
I will be adding AAC.
I have tested it with 2 different Webcams, an Ezcap capture dongle and of course vMix.
It supports the usual range of symbol rates 200K to 8M and the usual frequency range
65 MHz to 2.48 GHz.
The capturing is done using Windows DirectShow so in theory just about any device
that has DirectShow support will work with it. In practice there is bound to be some
device format I don't have support for.
I am currently doing the boring stuff, adding GUI support via the menus to configure
the large range of parameters.
On my reading list at the moment is the DTG D-Book 7 which describes the standards
that digital TV works to in the UK. Part A covers terrestrial transmission, the majority
of the spec is taken up with standards for connected TV, something that is not really
relevant to Amateur TV.
Everyone on the DATV-Express team is on holiday (except me) at the moment so not
much is happening. Hopefully I will have an initial version of the software available
in about 2 weeks time.