[mythtv-users] bad analog recordings from PVR-150

[FRAUCHIGER Daniel]

Hi,

do you have an older ivtv driver which can not properly handle the blanking interval?
Did you try to deactivate the vertical blanking interrupt function (vbi) of the pvr150 card in the mythtv setup?

Hope this helps, Daniel

________________________________________
Von: mythtv-users-bounces at mythtv.org [mythtv-users-bounces at mythtv.org] im Auftrag von Alan Marchiori [alan at alanmarian.com]
Gesendet: Donnerstag, 9. Juli 2009 16:19
An: Discussion about mythtv
Betreff: Re: [mythtv-users] bad analog recordings from PVR-150

On Thu, Jul 9, 2009 at 7:08 AM, jedi<jedi at mishnet.org> wrote:
> On Thu, Jul 09, 2009 at 04:14:26PM +1200, Nick Rout wrote:
>> On Thu, Jul 9, 2009 at 3:26 PM, Alan Marchiori<alan at alanmarian.com> wrote:
>> > I added a pvr-150 just for the heck of it.  The recording quality is
>> > really bad, however.  Almost like there is something wrong with the
>> > card/drivers/setup it doesn't seem to synchronize to the video
>> > properly.  My old nanalog tv gets a perfect picture from the same
>> > source.
>> >
>> > a short
>> > cat /dev/video0 > bad2.mpg
>> > is located at http://alamode.mines.edu/~amarchio/bad2.mpg
>> >
>> > the ivtv syslog entries are:
>> > [    6.306228] ivtv:  Start initialization, version 1.4.0
>> > [    6.306375] ivtv0: Initializing card #0
>> > [    6.306378] ivtv0: Autodetected Hauppauge card (cx23416 based)
>> > [    6.311990] ivtv 0000:01:06.0: PCI INT A -> Link[LNKA] -> GSI 17
>> > (level, low) -> IRQ 17
>> > [    6.361458] ivtv0: Autodetected Hauppauge WinTV PVR-150
>> > [    6.456485] cx25840 0-0044: cx25843-23 found @ 0x88 (ivtv i2c driver #0)
>> > [    6.458640] tuner 0-0061: chip found @ 0xc2 (ivtv i2c driver #0)
>> > [    6.458661] wm8775 0-001b: chip found @ 0x36 (ivtv i2c driver #0)
>> > [    6.530379] ivtv0: Registered device video0 for encoder MPG (4096 kB)
>> > [    6.530414] ivtv0: Registered device video32 for encoder YUV (2048 kB)
>> > [    6.530447] ivtv0: Registered device vbi0 for encoder VBI (1024 kB)
>> > [    6.530512] ivtv0: Registered device video24 for encoder PCM (320 kB)
>> > [    6.530514] ivtv0: Initialized card #0: Hauppauge WinTV PVR-150
>> > [    6.530548] ivtv:  End initialization
>> > [   20.572211] ivtv 0000:01:06.0: firmware: requesting v4l-cx2341x-enc.fw
>> > [   20.677881] ivtv0: Loaded v4l-cx2341x-enc.fw firmware (376836 bytes)
>> > [   20.876207] ivtv0: Encoder revision: 0x02060039
>> >
>> > any thoughts?
>>
>> yes your stream appears to be 480x480 pixels. Try 720x480 (I think
>> thats the NTSC dimensions, PAL will be 720x576)
>
>    Increasing your recording bitrate might also help. Depending on your
> source, you may just have a crap signal to deal with (DirecTV) and need
> to be more aggressive with your capture settings.


The source is plain old analog cable tv (ntsc).  I think the signal is
reasonably good because my old tv gets a clean picture.

I have looked through the ivtv docs quickly and don't see any easy way
to change the capture resolution or bit rate.  I assume I will have to
play around with v4l2-ctl ?
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