[mythtv-users] MythTV/CX88 Problems (yuyv)

[El Draper]

Thanks for the advice guys! Unfortunately, I still haven't got it sorted....

Pim:
I have updated the channel frequencies using mythweb, putting them in 
Khz. This hasn't fixed my problem, but at least when I get the recording 
problem sorted, the channels should be setup correctly, so thanks for 
the advice!

Mike:
Sorry, I should have said I am using version 0.16 of MythTV, but in RPM 
format from atrpms.net. I have tried setting the size to 352x240 (as you 
may have seen from the log output previously it was set to 480x480) 
however this hasn't solved the problem:

2005-01-11 15:50:19 TuneToFrequency(11636)
2005-01-11 15:50:19 Changing from None to RecordingOnly
2005-01-11 15:50:19 Using profile 'Default' to record
2005-01-11 15:50:19 Commercial Detection initialized: width = 352, 
height = 240, fps = 25, method = 1
NVR: v4l2: format set, getting yuyv from v4l, converting

[1]+  Segmentation fault      mythbackend -v all

Just so I'm sure, I changed the width and height in the "codecparams" 
table of the mythtv database, for the profiles that I'm using (in this 
case, "Default"). Are there any other width/height capture sizes that 
have any effect here, that maybe are still set to something bigger and 
are causing a problem?

Thanks for your help,
-= El =-


Mike Isely wrote:

>Which version of mythtv is this?  CVS?  0.16?
>
>I just hit what may be the same problem in setting up an ATI TV Wonder
>last night - also cx88xx based.  The yuyv conversion is a piece of logic
>that changes the frame buffer format on the fly.  It's definitely there,
>but it also stack allocates a large buffer to do the conversion and from
>looking at the source I suspect the buffer may be too small for the
>incoming frame buffer size.  I'm not entirely sure of the specifics yet,
>but I did note that the "default" size was 352x240 and when I changed the
>software encoder's setting to 352x240 the segmentation fault went away and
>Live TV started working.  Try changing that and see if it helps.
>
>This is the bug I just wrote up about the problem:
>
>http://www.mythtv.org/bugs/show_bug.cgi?id=189
>
>By the way, if/when you do get LiveTV working, are the colors trashed and
>the picture washed out?  That's a second problem I noticed.  It appears
>that the contrast has to be backed off to around 35%, and the Hue setting
>seems to have been implemented to think that the Hue V4L2 parameter is an
>unsigned char when in fact it's behaving like a signed char.  Setting Hue
>to 0 or 100% will fix the colors.  (Set the _recording_ Hue, not the
>playback Hue.)
>
>  -Mike
>
>
>On Tue, 11 Jan 2005, El Draper wrote:
>
>  
>
>>Hi guys,
>>I've been setting up a Linux PVR using MythTV on a Fedora Core 3
>>machine, with a recompiled 2.6.9 kernel (to fix some wifi issues). I
>>have a Hauppauge WinTV PCI tv card (CX88) and have successfully got the
>>program Zapping working with it, and capturing video etc. I have
>>configured MythTV, grabbed program listings etc, setup some channels;
>>however whenever the backend starts to record something I've setup to be
>>recorded, I get the following error:
>>
>>2005-01-11 02:39:17 Changing from None to RecordingOnly
>>2005-01-11 02:39:17 Using profile 'Default' to record
>>2005-01-11 02:39:17 Commercial Detection initialized: width = 480,
>>height = 480, fps = 25, method = 1
>>NVR: v4l2: format set, getting yuyv from v4l, converting
>>
>>[2]+  Segmentation fault      mythbackend -v all
>>
>>Now (from what little I know) yuyv is some form of codec? Could it be
>>that Myth has a missing dependency for this on my machine that is
>>causing this error? I have noticed that in trying to setup my channels
>>with the correct frequencies, I don't see anywhere for the exact
>>frequency in Mhz ("finetune" and "freqid" are int's). How can I setup a
>>channel with an exact frequency in Mhz? Could this be causing the above
>>problem when trying to record?
>>
>>I've searched around, so far unsuccessfully on this problem, so any help
>>you guys can offer would be great as I'm now a little stuck :-)
>>
>>Thanks!
>>
>>-= El =-
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>>
>>
>>    
>>
>
>  
>
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