[mythtv-users] performance and missing channels

[Tilman Kispersky]

Mike,

I am running Debian unstable with the debs from dijkstra.csh.rit.edu....

/etc/modutils/ivtiv:
alias char-major-81 videodev
alias char-major-81-0 ivtv
options ivtv ivtv_debug=1
options tuner type=39
options msp3400 once=1 simple=1

Scanning /var/log/messages for any pattern like: START INIT IVTV
gives nothing, maybe because debug=1??
but here is some other ivtv related output in /var/log/messages:
....
Oct  3 19:42:30 localhost kernel: ivtv: version 0.1.9 (release) loading
Oct  3 19:42:30 localhost kernel: ivtv: SGarray_size = 340, 
DSGarray_size = 16
Oct  3 19:42:30 localhost kernel: ivtv: Found an iTVC16 based chip
Oct  3 19:42:30 localhost kernel: tuner: chip found @ 0xc2
Oct  3 19:42:30 localhost kernel: tuner(bttv): type forced to 39 (LG 
NTSC (newer TAPC series)) [insmod]
Oct  3 19:42:30 localhost kernel: msp34xx: init: chip=MSP3445G-B8, has 
NICAM support
Oct  3 19:42:30 localhost kernel: msp3410: daemon started
Oct  3 19:42:30 localhost kernel: saa7114.c: starting probe for adapter 
ivtv i2c driver #0 (0x10005)
Oct  3 19:42:30 localhost kernel: saa7114.c: detecting saa7114 client on 
address 0x42
Oct  3 19:42:30 localhost kernel: saa7115.c: writing init values
Oct  3 19:42:30 localhost kernel: status: (1E) 0x48, (1F) 0xc0
Oct  3 19:42:30 localhost kernel: ivtv: Encoder revision: 0x02040011
Oct  3 19:42:30 localhost kernel: ivtv: Registered v4l2 device, minor 0
Oct  3 19:42:30 localhost kernel: ivtv: Registered v4l2 device, minor 32
Oct  3 19:42:30 localhost kernel: ivtv: Registered v4l2 device, minor 224
Oct  3 19:42:30 localhost kernel: ivtv: loaded
.....

I'll go ahead and install the latest ivtv driver. Is that sufficient or do
I need to patch the kernel as well?
How should my modules.conf look after this? What should I set tuner type=?

thanks,
Tilman



Michael T. Dean wrote:

> On 10/04/2004 11:49 AM, Tilman Kispersky wrote:
>
>> My myth setup is largely complete.
>>
>> Currently, for some reason I am unable to view channels other than 5 
>> and 7.
>> I've got lots of other ones on my TV, they just come through as 
>> static on my computer when I change to them
>> using mythfrontend. The channel guide data exists (the info bar 
>> correctly identifies
>> the channel and what should be playing), the picture is static and 
>> there is no audio. The
>> only strange setting in my setup is that I set tuner type=39.  I was 
>> getting only a black
>> screen before, and setting type=39 gave me the two channels I have 
>> now, and the static.
>> (thats at least a step in the right direction).
>> Does anyone have any experience with this problem and know what I 
>> have to do to see
>> all channels??
>
>
> You have specified the wrong tuner type.  You probably have the TCL 
> 2002N tuner--which is not yet supported by the tuner module that ships 
> with the Linux kernel.  Therefore, you need to do some patching.
>
> Please post:
> Your distribution
> The ivtv-related info from mod{ules,probe}.conf
> The ivtv initialization info, which can be obtained from your system 
> log file--assuming /var/log/messages--with:
>
> tac /var/log/messages |
> sed -n '/=  END INIT IVTV  =/,/= START INIT IVTV =/p;
>        /= START INIT IVTV =/q' |
> tac
>
>> Another question
>> I am running myth on a Duron 800 with Haup. 250.  Encoding takes 
>> about 15-20% CPU (does that seem about right?).
>> and decoding (watching a stored program) a full 100%.  I am using 
>> integrated video for this,
>> how much of a performace gain would I get with an improved video card? 
>
>
> Depends on which video card you're using currently.  If the video 
> drivers for your current card support the X Windows Video extension, 
> Xv (you can find out by running xvinfo--"no adapters found" is bad), 
> you probably won't see much difference.  If they don't support Xv, 
> you'll see a huge difference.
>
> Mike
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