[mythtv-users] Re: HDTV AIR2PC amd64 frontend/backend

SpikeyGG spikeygg at hotmail.com
Fri Mar 25 23:10:44 UTC 2005


Paul,

I just (about two months ago) purchased an AMD64 system, 3500+ 90nm 939pin.  I'm using it with a MSI K8N Neo2 Platinum board.  I first wanted to do as you are planning, run a 64-bit linux.  I purchased a pcHDTV card to use with the box.  When I got all of it up and running using a Debian port for AMD64, I found that I couldn't use MythTV... I followed all the instructions and wasn't able to get it to work reliably.  I made a few posts to pcHDTV forum, myth-users, and mythtvtalk.com but no one responded (and still haven't).  Worried that I wouldn't be able to get this project off the ground I reinstalled and used the plain-jane 32-bit version of Debian and I have it working beautifully.

BTW: I am using DVB drivers.

Streaming an HD signal over the air and displaying it takes anywhere from 60-85% cpu usage so don't plan on doing any HD picture-in-picture with your AIR2PC cards.  If you're just dumping it to disk it's less than 10% cpu.  I think I'm going to get one more pcHDTV card so I can record a given channel and watch/record another one simultaneously.  Anywho, the problems I am having now are much less annoying then the AMD64 issue of having the frontend lock up most of the time just trying to watch a recording or going to watch live tv.

My biggest issue with myth now is that every once in a while, changing channels results in a garbled screen, while the backend throws out messages like this:
2005-03-10 20:47:00.157 DVB#0 WARNING - Transport Stream Continuity Error. PID = 49 
2005-03-10 20:47:00.157 DVB#0 WARNING - Transport Stream Continuity Error. PID = 49 
2005-03-10 20:47:00.157 DVB#0 WARNING - Transport Stream Continuity Error. PID = 49 
2005-03-10 20:47:00.157 DVB#0 WARNING - Transport Stream Continuity Error. PID = 49 
2005-03-10 20:47:00.157 DVB#0 WARNING - Transport Stream Continuity Error. PID = 49 
2005-03-10 20:47:00.157 DVB#0 WARNING - Transport Stream Continuity Error. PID = 49 

the frontend complains about this:
[mpeg2video @ 0xb7869050]slice mismatch 
[mpeg2video @ 0xb7869050]ac-tex damaged at 10 30 
[mpeg2video @ 0xb7869050]invalid mb type in P Frame at 7 33 
[mpeg2video @ 0xb7869050]slice mismatch 
[mpeg2video @ 0xb7869050]invalid cbp at 43 38 
[mpeg2video @ 0xb7869050]ac-tex damaged at 17 43 
[mpeg2video @ 0xb7869050]mb incr damaged 
[mpeg2video @ 0xb7869050]mb incr damaged 

This locks up my DVB card until mythbackend stops using it.  I was originally killing both the frontend and backend and restarting them both until I found a switch in the setup to have mythbackend release the card when not in use by a frontend.  This makes it so that whenever it gets screwed up, I can just exit live tv and reenter and it'll work again.  It's a work-around but I'd still like to fix the issue.

Well, if you decide to go AMD64 and use an AMD64 port of linux, good luck!  If anyone has Debain AMD64 port working with a pcHDTV card and Myth, I'd love to hear about your success.

Later,
-Greg
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