[mythtv] Re: [XFree86] Relationship of XVideo to V4L
vektor at dumbterm.net
Tue Jul 8 15:12:03 EDT 2003
Michael J. Hammel (mythtv at graphics-muse.com):
> MythTV seems to want to work with V4L devices. My understanding is
> that XFree86's v4l module will provide an Xv interface to V4l devices.
> Is that correct? This assumes the TV is accessible through a V4l
> driver, ie Xv sits atop V4L - is this also correct?
XVIDEO does two things. It provides an API allowing applications to
draw their own video to the screen, and it also provides an API to have
X talk directly to the capture card simply for displaying on the screen
The driver you're using, afaict, can _only_ display video to the
screen, and not capture. This means that mythtv CANNOT record using it.
> If I'm right about this, the only way to support my hardware would be
> 1. write a V4l driver for the TV hardware and make the X server not
> manage that hardware
> 2. Add direct Xv support to MythTV
No. The XVIDEO API for displaying video does not provide a usable
interface for recording video streams.
Send the output of 'xvinfo' and you'll likely see that no capture
capabilities exist anyway.
More information about the mythtv-dev