Re: [Discuss-gnuradio] SDR HDTV

[Eric Blossom]

On Fri, Mar 07, 2003 at 04:01:46AM -0800, John Cortes wrote:
> 
> Eric,

> that sample you had available on your website was ATSC, correct?

Yes.

> I tried running the commands you had listed for extracting the video
> stream: run_rx -L -s 20 <file> -o <output>,

This command should have given some idea of it's packet error rate.
As I recall with the data on the web site, it's pretty low (in the
neighborhood of 1e-5).

> but when i run Xine, it doesn't work.  It gives an error on demuxes,
> and when i press play on xine, i hear a short 1 second audio sample
> then xine quits because of an allocation error.

I've successfully used:
     xine-lib-1-beta6.tar.gz (a quick look revealed that they are now
                              on 1-beta8)
     xine-ui-0.9.18.tar.gz

See http://xinehq.de            

Was the "allocation error" something about "no resources on X-server"?
I've seen that, and got around it by using the X shared memory video
driver.  I think that this all depends on your video hardware.

Try: xine -V Xshm transport-stream.ts

Re: 1 second, how big is your transport stream?  They're about 2.4
MB/second.

> On the other hand, have you guys devised a demodulation scheme for
> NTSC (analog tv?) signals, and 

We haven't, though there is some old code that I believe once upon a
time demodulated black and white NTSC in
gnuradio/src/pspectra/lib/vrp/needs-work/VrTV.h 
It shouldn't be too hard to get it running.

> would you happen to have any samples available?

I'll put some up.

Eric