[mythtv-users] Choppy Video Problems

Darren Black lists.drdaz at gmail.com
Sun May 22 19:59:48 UTC 2005


On 5/22/05, <SB> Childe Roland <rolandchilde at gmail.com> wrote:
> I am having a problem with my new KnoppMyth box.
> 
> 1. Everytime I change the channel the video and sound skip some.
> Sometimes this continues, but can be fixed by pausing the video and
> waiting a few seconds
> 2. Both Live tv and recorded seem to have extremely low frame rates.
> The video is much more choppy than it should be
> 
> I don't think it is my system (see specs below) and the TV Tuner
> should have hardware encoding.
> 
> I think these problems are both related to the HDD. When I run the
> "hdparm -Tt" test I get a cached read in the 400's (MB/sec), but the
> timing buffered disk reads only gives me between 9 and 20 MB/sec.
> The drive is extremely old and only supports ATA 33.
> 
> Could this be the problem?? I'd like to upgrade to get more space, but
> it won't be worth it if it's not going to give me a full 30 fps. Also,
> is it perhaps a setting in MythTV that I have missed?
> 
> 
> My specs -
> Athlon Sempron 2400+
> 512 MB DDR 333
> 20 GB ATA-33 HDD
> Hauppauge PVR-150 (non MCE)
> 
> Machine Status:
> Load: 1.30, 0.61, 0.23
> RAM: 501MB, 396 MB used, 105 MB (20%) free
> Swap: 490 MB, 0 used
> --
> =============================
> <SB> Childe Roland
> "I will show you fear in a handful of jellybeans."
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> mythtv-users at mythtv.org
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> 

**Crossposting to ivtv-devel**

I am experiencing the same problems. We have similar setups, but my
harddisks are fairly new and really not slow. I've crossposted to
ivtv-devel because I think the issue is related to the ivtv driver.
Mythfrontend outputs 'prebuffering pause' whenever the video stutters.
As you say, this only happens when I change channel, and is cured by
pausing a couple of seconds.

>From my browsing in the ivtv posts, I get the idea this has something
to do with vbi code (given when this error started occuring) and what
people are talking about generally ;) Is there anything that people
who really arent looking to use CC/TXT can do to the driver to make
this error go away? I perhaps have the wrong idea here... feel free to
let me know if I have ;)

Regardless... Any suggestions would be welcome.
/drdaz


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