[mythtv-users] Configuring USB3 HDMI capture device non-HDCP source

[Robert LeBlanc]

On Aug 15, 2017 7:01 AM, "Devin Heitmueller" <dheitmueller at kernellabs.com>
wrote:

> This looks to be setting the input format to NTSC.  I wouldn't have
thought
> that was correct. Did you set the card up as a digital card? After you
> tried as an analogue card did you do a "delete all capture cards on all
> hosts" to scrub the settings?

>From a MythTV perspective, it should be treated as an analog capture
card since it uses the standard V4L2 raw video capture interface.  The
fact that the underlying video source is HDMI (e.g. a digital format)
as opposed to an analog video format such as NTSC is incidental.

That said, MythTV does make some assumptions with regards to the rates
at which the raw video capture interface will deliver video (see my
previous email).

The user might be able to reconfigure his video output at the cable
box to output at 1080p/30 rather than 1080p/60, at which point it
would likely work (although I wonder if perhaps lipsync will drift
over an extended period of recording).


I believe the device can output in a few different formats, I'm going to
mess with that a bit today. For the analog capture devices, I can't set the
recording profile to 1080p, only like 700x580 or something so the device is
downscaling. I'll see if I can use v4l2-cfg to set the frame rate. When I
do a non-raw capture, it understands that the frame rate is 30 or 60
(depending on what I set in steamer) and VLC reports that and plays it back
properly.

I can also try twiddling with the code to see if I can get some additional
parameters passed to the device, do you know where this code would be?

Thank you,
Robert

Sent from a mobile device, please excuse any typos.
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