[mythtv-users] HD-PVR recordings oversaturated

Jerry Rubinow jerrymr at gmail.com
Mon Aug 29 18:33:16 UTC 2011

On Mon, Aug 29, 2011 at 1:20 PM, Michael T. Dean <mtdean at thirdcontact.com>wrote:

> On 08/29/2011 11:26 AM, Jerry Rubinow wrote:
> >> On 29/08/2011 12:56 AM, Jerry Rubinow wrote:
> >>> On Sat, Aug 27, 2011 at 12:28 AM, Jerry Rubinow wrote:
> >>>
> >>>>      On Fri, Aug 26, 2011 at 11:28 PM, Jerry Rubinow wrote:
> >>>>> I just upgraded the firmware on my HD-PVR from version 0x12
> >>>>> May 7, 2009 to the latest from the Hauppauge web site, 0x17
> >>>>> July 27, 2011.  Now all recordings from the HD-PVR are way
> >>>>> oversaturated.  Catting /dev/video0 and playing the file with
> >>>>> vlc yields the same result.  According to v4l2-ctl -l, the
> >>>>> settings are all at defaults.
> >>>> I tried adjusting the brightness and contrast in the channel
> >>>> change script, via:
> >>>>
> >>>> /usr/bin/v4l2-ctl --device=/dev/video0 --set-ctrl=brightness=100
> >>> It seems like Myth must be setting the hd-pvr to a default state after
> >>> running the channel change script.
> > That's an excellent kludge, thanks for the idea.  I'll try that out
> tonight
> > and hopefully that'll last until I'm able to find older firmware or
> > otherwise figure out why this started happening.
> >
> > Janne, Jarod, or anyone who's familiar with the driver, any ideas?  Is
> there
> > a potential kernel incompatibility with the firmware?  I wanted to save
> > doing a full system update as a last resort since things are otherwise
> > pretty stable.
> I'm definitely not "anyone who's familiar with the driver", but I will
> say that for other analog encoders (such as the IVTV devices), MythTV
> always sets the contrast, brightness, color (or colour, as the case may
> be), and hue according to the values you specified--which all start at
> default values.
> You can change the default values by using G in Live TV playback to set
> the capture card picture controls.  Note that this will not work on a
> digital capture device (DVB/ATSC/QAM/Firewire/...) because those aren't
> actually recording the video, but just writing the provided recorded
> video stream.
> Using G to set the capture card picture controls differs from using F to
> set the playback picture controls.  F is used in Live TV or recording
> playback to change the contrast, brightness, color, and hue at
> playback--and affects playback of all recordings and videos, regardless
> of channel and capture device.  Note, also, there's a per-channel
> picture control available, in which you can specify contrast,
> brightness, color, and hue for individual channels using the
> mythtv-setup or MythWeb channel editor.  You also don't want
> this--especially if you have, for example, an IVTV card recording from
> the same channel.
> I don't know if this applied to HD-PVR, but before you go and set up a
> hack, try G--and then tell all the others who are using the hacks if it
> works properly for the HD-PVR.  :)

Mike, thanks for that, I will try it tonight.  Are the settings accessed by
G saved in the database, or do they just apply to the current mythbackend

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