[MPlayer-users] BUG: mencoder segvault with -vf pullup [partial bugreport]
bugfood-ml at fatooh.org
Sat Sep 13 23:43:55 CEST 2003
D Richard Felker III wrote:
> The problem is your crop parameters -- they don't make sense. Granted,
> it shouldn't segfault, but it's impossible to inverse telecine 716x374
> video since height isn't a multiple of 4. (Chroma plane is half
> sampled = 358x187, whereas with interlaced video you must have 2
> fields and this even height.) If you're going to crop before passing
> input to pullup, both height and y-offset must be multiples of 4.
> I would recommend just overcropping a little (crop=716:372:4:48, or
> better yet crop=704:372:10:48), but if you insist on exact cropping,
> you can wait to do the crop til after inverse-telecine.
Aah, I figured it would be something like that. But I didn't think about
multiples of 4. So, does that mean that each field has a height of 1
chroma pixel, which is 2 luma pixels?
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