Re: Interlaced video, VSYNC locking, etc

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]



On Saturday 26 Jan 2002 9:03 am, you wrote:
> > > I have found that I can get pretty close (although the
> > > interlacing isnt perfect) by using video compressed as described
> > > above, leaving the flicker filter on, and blit-stretching each video
> > > frame to the full display buffer. It looks pretty close although on
> > > some sources the interlacing can look a little stronger than it
> > > should.
>
> You are reconstructing the temporal resolution nicely, but I think that
> you are halving your possible vertical resolution from 576 back to 288.
>
> With conventional interlacing, eye/brain persistance would reassemble the
> lines of the two fields, allowing each line to be resolved.  But your blit
> and the filter blurs each two lines together.
>
I dont seem to be (and the results look ok). If I was only blitting at 25 
fps, then I would be loosing resolution and framerate. But because Im 
blitting every field im getting 50fps. Even though the 720x288 is getting 
stretched (with a linear interpolation blit by the way) and filtered on the 
output, the output chip is still producing 50fps from 50 unique source 
frames. Its probably adjusting its filter characteristics for odd/even field, 
which i would guess is why the interlacing isnt 100%, but if you have a peice 
of video with a sharp horizontal line thats only in one field the output has 
the same sort of flicker as the input.

DP





[Index of Archives]     [Linux DVB]     [Video Disk Recorder]     [Asterisk]     [Photo]     [DCCP]     [Netdev]     [Xorg]     [Util Linux NG]     [Xfree86]     [Free Photo Albums]     [Fedora Users]     [Fedora Women]     [ALSA Users]     [ALSA Devel]     [Linux USB]

Powered by Linux