[mythtv-users] pcHDTV card analog NTSC input

[Michael T. Dean]

On 04/09/2006 01:43 AM, Greg Stark wrote:
> Greg Stark <gsstark at MIT.EDU> writes:
>> Ah, I discovered the wonders of v4lctl. 
>>
>> The "contrast" seems to default to 127 (the very maximum) when the module is
>> inserted. Setting it to 63 (supposedly the default) fixes the contrast
>> problem.
>>
>> And setting the "volume" to the maximum 63 makes it quite reasonable.
>>     
> I keep responding to myself, sorry.
>
> But this is fascinating. The contrast setting keeps getting set back to 127
> every time mythtv goes to record something. I don't know if this is mythtv's
> fault or the driver's. 
>   

Press G while in LiveTV...

> Oddly that's not the case for the volume. Once set it stays. So it's not a
> matter of all the settings going back to some default. It seems somehow the
> contrast is specifically being reset back to the maximum.
>   

Myth does set the volume to the value you specify in your capture card 
configuration...

> Also, is there any way to set the overscan for an input? This card is
> including the first few lines where the closed captioning and stuff is and it
> would be nice to have mythtv trim it off before recording.

You can apply the crop filter on recording.  
http://mythtv.org/docs/mythtv-HOWTO-10.html#ss10.4

Mike