[MPlayer-users] 60p -> 60i conversion (was Re: 60p -> 24p conversion for ATSC)

[Walter Belhaven]

Rich Felker wrote:
> 
> The basic idea is:    -vf tinterlace,pullup
> 
> Strictly speaking this is not correct since the pairs of frames
> interleaved together are actual frames, not fields offset by half a
> line from each other. [...snip...] There are tricks using
> nearest-neighbor resampling with the scale filter to get the exact
> right behavior and compensate for the incorrect fake interlacing
> that tinterlace makes, but I wouldn't suggest trying such things
> unless you have a problem with the output, since you're likely to
> make it worse if you don't understand the repercussions.

Hi Rich,

Would you mind sharing those tricks?  I'm trying to convert "real"
720p video (i.e., 60000/1001 unique progressive frames per second) to
480i video (60000/1001 interlaced fields per second) to burn on an
NTSC DVD, and I think those tricks would be applicable here too.

Taking a step back, it Sounds like there are at least two applications
(60p -> 24p, and 60p -> 60i) that could use a "Case 4" in
vf_tinterlace.c.  I'd implement it myself if I had the talent to do
stuff like that.  I'm still trying to figure out what a stride is
though. :)

Thanks,
WB


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