[linux-dvb] Re: V4L interface to the MPEG stream?

[Gerd Knorr <kraxel@bytesex.org>]

Michael Hunold <hunold@convergence.de> writes:

> This does not make sense. v4l and v4l2 are basically the same -- they
> are APIs that userspace programs can use to communicate with
> videohardware in a specified manner. They don't have anything to do my
> MPEG encoding or decoding.

The v4l2 can handle compressed video frames (unlike v4l1), and there
is a V4L2_PIX_FMT_MPEG ...

v4l2 will not do any mpeg compession for you, but it should be able to
handle hardware which gives you mpeg-compressed video.  The whole
thing is still a bit work-in-progress through, there are no ways (yet)
to control mpeg compression parameters and stuff like that.  The guys
which are writing the driver for the wintv pvr 250/350 are likely the
first ones which actually use this.

> > Secondly, mythtv accepts input from a v4l2 device in MPEG 2 format.
> > Is this possible under v4l2 then?  Does the input not have to be
> > straightforward uncompressed yuv type output?
> 
> As I already said above, v4l2 has nothing to do with MPEG at all.

Wrong, see above.

  Gerd

-- 
Michael Moore for president!


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