[mythtv] problem with HDTV in Australia
David.Berry at dcita.gov.au
Thu Jul 28 20:07:37 EDT 2005
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
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
Just an idea.
From: mythtv-dev-bounces at mythtv.org
[mailto:mythtv-dev-bounces at mythtv.org] On Behalf Of Hamish Moffatt
Sent: Friday, 29 July 2005 9:25 AM
To: mythtv-dev at mythtv.org
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
Hamish Moffatt VK3SB <hamish at debian.org> <hamish at cloud.net.au>
The information transmitted is for the use of the intended recipient only and may contain confidential and/or legally privileged material.
Any review, re-transmission, disclosure, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited and may result in severe penalties.
If you have received this e-mail in error please notify the Security Advisor of the Department of Communications, Information Technology and the Arts, telephone (02) 6271-1880 and delete all copies of this transmission together with any attachments.
For all other enquiries please ring (02) 6271-1000.
More information about the mythtv-dev