[x264-devel] Vertical 'flickering' problem/bias in x264?

[Jason Garrett-Glaser]

On Thu, Jun 20, 2013 at 1:56 PM, Derek Buitenhuis
<derek.buitenhuis at gmail.com> wrote:
> I've noticed on several 4:2:0 input files of screecasts (lots static images and text), that
> x264 seems to exhibit a vertical (as in it does not happen when one uses 4:2:2 or 4:4:4
> output) 'flickering' problem on some static antialiased text -- specifically, ClearType.

This looks like a wonderful case of deblocking causing artifacts. It
seems to be endemic to B-frames because of the relatively high
quantizer being used; it doesn't happen in P-frames.

I don't know if there's an easy solution; do you have a short input
sample (lossless) that reproduces the problem so I can investigate?

Jason