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nybbler
PostPosted: Sat Sep 23, 2006 4:37 pm 
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Joined: Sun Jul 09, 2006 7:54 pm
Posts: 29
I finally figured out my nVidia 6150 XvMC just couldn't consistently keep up with HDTV, at least not with current drivers and scaling the video as well as decoding it. So, since my system was _almost_ fast enough to decode HD without it, I decided to bite the bullet, wipe out KnoppMyth, and go for a 64-bit solution.

After making a KnoppMyth backup, I started with 64-bit Ubuntu 6.06, removed a lot of the cruft (Evolution and OpenOffice mainly -- starting with Xubuntu might have been a better choice), installed the necessary drivers and packages, patched the kernel with the real-time patches, and compiled MythTV 0.2. Then restored the database. Night and day -- where I'd peg the CPU before, I now take up about 60% of the CPU decoding and deinterlacing 1080i content. Less for 720p.

System specs:
Asus A8N-VM CSM
Athlon 64 3200+ (Venice Core)
1GB RAM (no swap, 128M dedicated to the 6150)
PCHDTV 5500
iMon Pad remote (Silverstone LC-11M case)
DVI out to a 720p TV
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Human
PostPosted: Tue Sep 26, 2006 3:10 pm 
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Joined: Thu Sep 30, 2004 11:29 am
Posts: 2419
Location: Mechanicsburg, PA
It's not your nVidia 6150 - it's the Athlon 64 CPU. For some reason, KM and 64-bit CPUs aren't getting along very well anymore, and it's most evident with MythTV 0.20. I'm in the process of identifying the root cause.

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MythiC Dragon v2.0
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thornsoft
PostPosted: Tue Sep 26, 2006 3:34 pm 
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Joined: Fri Nov 18, 2005 9:22 am
Posts: 777
Location: spencerport, ny (USA)
Human wrote:
KM and 64-bit CPUs aren't getting along very well anymore

I wish you well!
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steven_ellis
PostPosted: Tue Sep 26, 2006 11:44 pm 
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Joined: Wed Jan 18, 2006 6:33 pm
Posts: 96
Human wrote:
It's not your nVidia 6150 - it's the Athlon 64 CPU. For some reason, KM and 64-bit CPUs aren't getting along very well anymore, and it's most evident with MythTV 0.20. I'm in the process of identifying the root cause.


Interesting. I'm running Knoppmyth R5B7 with a rebuild of MythTV 0.20 which seems to behave reasonably well. at what point did Knoppmyth start behaving badly on 64bit CPUs.

Steve

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OpenMedia Limited
New Zealands first open source PVR based on Knoppmyth
http://www.openmedia.co.nz for details
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gr8nash
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PostPosted: Wed Sep 27, 2006 1:33 am 
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Joined: Thu Apr 01, 2004 10:44 am
Posts: 677
Location: WA
IM also battleing this problem, and it has todo with HD resolutions more then just any video.. my AMD 3500+ no longer has enough beens to decode 720p or 1080i
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Human
PostPosted: Wed Sep 27, 2006 9:53 am 
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Joined: Thu Sep 30, 2004 11:29 am
Posts: 2419
Location: Mechanicsburg, PA
steven_ellis wrote:
Interesting. I'm running Knoppmyth R5B7 with a rebuild of MythTV 0.20 which seems to behave reasonably well. at what point did Knoppmyth start behaving badly on 64bit CPUs.

That's an excellent question, and I don't have an answer for you. I do know that when I built MythTV 0.20 on R5C7, it performed slightly better than it did with R5D1. If you're getting good results with R5B7 + 0.20, either this means that the problem I'm trying to find happened between R5B7 and R5C7, or your CPU is sufficiently beefy to play back all your content without spiking.

What CPU load are you seeing when playing back 1080i content using libmpeg2 and linear blend?

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MythiC Dragon v2.0
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mrshark
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PostPosted: Thu Sep 28, 2006 12:57 pm 
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Joined: Wed Aug 09, 2006 2:47 am
Posts: 21
I've an asus m2npv-vm mobo, with a asus mycinema p7131h hybrid tv card, 512mb ram and amd sempron 3ghz.
i had to put:

options saa7134 card=78

in /etc/modprobe.conf

to bypass faulty autodetection (have i to pass tuner= parameter, too? i don't know which one is it, however...)

restarting i see this in dmesg:

Code:
saa7133[0]: found at 0000:04:08.0, rev: 209, irq: 20, latency: 32, mmio: 0xfdbfe000
saa7133[0]: subsystem: 1043:4876, board: ASUSTeK P7131 Dual [card=78,insmod option]
saa7133[0]: board init: gpio is 0
saa7133[0]: i2c eeprom 00: 43 10 76 48 54 20 1c 00 43 43 a9 1c 55 d2 b2 92
saa7133[0]: i2c eeprom 10: ff ff ff 0f ff 20 ff ff ff ff ff ff ff ff ff ff
saa7133[0]: i2c eeprom 20: 01 40 01 02 03 01 01 03 08 ff 00 d5 ff ff ff ff
saa7133[0]: i2c eeprom 30: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
saa7133[0]: i2c eeprom 40: ff 21 00 c2 96 10 03 32 55 50 ff ff ff ff ff ff
saa7133[0]: i2c eeprom 50: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
saa7133[0]: i2c eeprom 60: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
saa7133[0]: i2c eeprom 70: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
tuner 0-004b: chip found @ 0x96 (saa7133[0])
tuner 0-004b: setting tuner address to 61
tuner 0-004b: type set to tda8290+75a
saa7133[0]: registered device video0 [v4l2]
saa7133[0]: registered device vbi0
saa7133[0]: registered device radio0


which is the dvb-t device (/dev/dvb/adapter0/video0 cannot be used, while present...)??? However, enabling xvmc and viewing NORMAL live tv, not hdtv, i get this with top:

Code:
5254 mythtv     0   0  289m  51m  14m S 41.9 10.9   0:27.39 mythbackend
5800 mythtv     0   0  215m  95m  36m S 24.9 20.4   0:22.41 mythfrontend
5624 root       0   0 45396  36m  14m S  7.6  7.8   0:18.85 X


while i was expecting very low cpu usage, not about 42+25%...

tvtime can find very less channels (respect my normal tv), and i don't know how to look for dvb-t ones... hints?

the founded channels are very low quality, pixelized, some with horizontal black lines moving up... on windows the same tv card works very well...
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