[mythtv-users] VBI/Closed Captions with HD-PVR

Devin Heitmueller dheitmueller at kernellabs.com
Thu Jan 16 05:01:46 UTC 2014


On Wed, Jan 15, 2014 at 11:27 PM, Bob <mythtv at cox.net> wrote:

> 2. The driver defaults to PAL where I need NTSC

Assuming "zvbi2raw" really is just intended to capture NTSC closed
captions (i.e. not also trying to support PAL teletext), it really
should be modified to issue a V4L2 S_STD ioctl() call to the driver to
ensure it's always in NTSC mode.

> 3. The zvbi2raw command would time-out if video is not being read from the
> device

Yeah, this was my bad.  I made the same mistake on the HVR-950q
driver.  When writing the code for both drivers I was testing with
tvtime, and hadn't considered the possibility that somebody would want
to use the device *just* for VBI capture.  As a result, the starting
of streaming from the actual device is triggered based on the use of
the video device node, rather than referencing counting and starting
the stream when the first user attempts to get access to the content
(whether it be VBI or video data) and stopping the stream when the
last consumer closes the device node.

Devin

-- 
Devin J. Heitmueller - Kernel Labs
http://www.kernellabs.com


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