Artifact with Height not Multiple 16 on x264

[3ngel]

Hi,
i've noted an artifact that appears when the height is not 16 multiple.
The artifact is 10pix (+-) height horizontal line that appear slightly blurred compared with all the rest and it's positioned about 20pixel from the bottom and goes straight from left to right.
Cropping the same source at 16 multiple, with same setting the stripe artifact goes away.
Why's that?

[foxyshadis]

Broken decoder, most likely, unless at some point you're extracting to raw avc and reimporting to mp4/mkv (which I've noticed sometimes resizes the video to be full mod16). What are you using to decode?

[3ngel]

I've tested it both doing a raw 264 then muxing in mkv and directly mkv. I use CoreAvc for decoding, but i haven't tested with ffdshow. I'll do a test as i've time.