[mythtv-users] rtJpeg ugly artifacts?

[Michael Thome]

I'm having trouble with my new mythtv box using rtjpeg for live tv - I 
see some very significant decoding (or maybe encoding?) errors on any 
live software-compressed stream from the analog side of my pchdtv hd5500 
- it manifests very much like a DTV stream with line noise - big square 
blocks of solid color.  Switching the software encoder to mpeg4 makes 
avoids this problem, but at a significant leap in processing power.  My 
guess is that it is in the rtjpeg _decoding_, since rtjpeg separately 
compresses each frame, any errors shouldn't be persisting for the second 
or two that what I see is.  I was seeing the problem out of the box 
(with default myth settings).

I haven't been able to find this as a known problem, but as a newbie I'm 
probably not looking in the right places.

I'm running a vanilla ubuntu edgy with myth 0.20 from the default 
repositories (used the ubuntu wiki docs on setting up myth almost 
verbatim).  I did hand-updates of lirc, ivtv, and v4l-dvb to support my 
hardware with the recommended versions, but I've left all the rest as 
standard versions.

Any suggestions or avenues of approach for troubleshooting would be most 
welcome...

Thanks!
-- 
*Michael Thome*
BBN Technologies 10 Moulton St, Cambridge MA 02138 USA
phone: +1 617 873 1853