[FFmpeg-user] vertical lines noise in scaled raw video.

Andy Sheen sheen.andy at googlemail.com
Wed Nov 9 17:05:59 CET 2011

I've downloaded your ffmpeg recode. As far as I can tell I can't see any
vertical lines on a calibrated monitor (playing with mpc-hc).

Do you have the latest drivers for your graphics card? Tried it on a
different PC/output device? It may be a rendering problem.

Dennis wrote on Wed 09 Nov at 15:31 UK time
> A long story, but will try to keep it short.
> Was converting MPEG2 to H,.264 noticed that video has faint but persistent
> vertical lines top to bottom. It's not extremely noticeable, but gets very
> annoying as lines stay in one place and 'burn in' after a while.
> Playback: QuickTime, VLC and FFplay media players.
> Encoding: FFmpeg 0.8.6 release with latest libx264 (Nov 5th tar ball).
> Source file:http://www.mediafire.com/?khrzaps202b1ksq
> FFmpeg & libx264: http://www.mediafire.com/?3fkyzo1oh5d6l72
> X264 encode(y4m to H264): http://www.mediafire.com/?g8x2ww1rcwhm08k
> y4m file (scaled to 800x448 by ffmpeg):
> http://www.mediafire.com/?y8cvvk07r1vegna
> Any advice on removing these lines, perhaps a video filter? Or other ways
> control the reduction of chroma spread, so that dark grays are encoded as
> black?
> Thank you all.
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