what you had sounds like you forgot to compile your kernel such that its
using PIO rather than DMA to perform I/O.
a disk should be more than capable of keeping up with multiple 20 Mbps
streams .. after all, its only a few MB/s.
Hamish's problems sound like something else ..
i haven't tried HDTV here for a while (also Melbourne Australia) - as i
don't have a HDTV-capable TV - but when i did, i found that it worked ok
on Athlon XP2800+ using ffpmeg-based decoding with playback onto screen
resolution of 1920x1280.
cheers,
lincoln.
Berry, David wrote:
Disk speed not up to scratch??
I was getting these errors attempting to play back a normal DVB-T
recording on a raid5 setup - once I changed to a LVM setup, the errors
disappeared.
My theory was that it was too much for the bus to handle streaming the
file _and_ reading from all the disks at once - with LVM - it's only
going to be accessing one disk at a time. Now I can also do PIP with no
errors.
Just an idea.
David.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Hamish Moffatt
Sent: Friday, 29 July 2005 9:25 AM
To: [email protected]
Subject: [mythtv] problem with HDTV in Australia
Hi. I'm attempting to watch HDTV recorded in Australia (on DVB-T).
The backend logs show that a test program was recorded fine (no DVB
errors reported). However when I play back the recording, the frontend
logs MPEG decoder errors continuously.
2005-07-28 23:11:37.252 Changing from None to WatchingPreRecorded
2005-07-28 23:11:37.253 Using realtime priority.
2005-07-28 23:11:37.377 Video timing method: SGI OpenGL
[mpeg2video @ 0xb7765010]ac-tex damaged at 68 21
[mpeg2video @ 0xb7765010]Warning MVs not available
[mpeg2video @ 0xb7765010]invalid cbp at 26 17
[mpeg2video @ 0xb7765010]ac-tex damaged at 51 39
[mpeg2video @ 0xb7765010]ac-tex damaged at 62 53
[mpeg2video @ 0xb7765010]invalid cbp at 58 40
[mpeg2video @ 0xb7765010]invalid cbp at 51 50
[mpeg2video @ 0xb7765010]ac-tex damaged at 54 37
[...]
I get a few of those every second or two. The picture breaks up briefly
every few seconds also. Sound is fine.
I posted two samples of the recording; being 1080i, the data rate is
very high. 5.7Gb for 80 minutes in total.
10Mb version: http://www.risingsoftware.com/~hamish/hdtv/shorthdtv.mpg
30Mb version: http://www.risingsoftware.com/~hamish/hdtv/shorthdtv2.mpg
This is recorded from channel 10 in Melbourne, for any Aussie readers.
The CPU (AthlonXP 2600+) is about 50% idle. (GF4MX440 video, using
Xv but not Xvmc.) Tried libmpeg decoding as well but it was no better.
I remember a discussion a while ago about separate PCR streams in
Australia that weren't recorded or used properly or similar. Is that the
problem here?
Hamish
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