problem of aliasing on exports of mp4

Hi all!

I'm working on an animation in After Effects, I did not know where the animation will be played, so I worked it in HD, 1920 x 1080.

So when I want to export, I put my composition to the render queue and I export it in the optimal settings, QuickTime format. So far there is no problem, but when I send to validation (with a webplayer) people I need a resolution of 800 x 450, so I put my QuickTime export in Adobe Media Encoder, set the resizing, choose format H264 (VBR 1, 3Mbits/s) and I made the file.

But after rendering just the problems... Problems of aliasing big! I have try 10 or 15 way to export it, with different formats, different sizes, different codecs... Nothing, but just this bad stairs made from pixels:

(original .mov, played in QuickTime format)

anim.png

(mp4 exported played in QuickTime)

anim2.png

(mp4 exported played in windows media player)

anim3.png

In a web browser, the aliasing is just too dirty, worse than in windows media player... You know a way to export an After Effects animation in .mp4 without aliasing problem?

I hope that someone will explain to me what is this mess, I thank you in advance! :-)

Thomas

Fringes in compressed images mean that the contrast is too extreme and it causes the signal feedback or clipping in the compression algorithms. At best you can try to adjust the colors and Desaturate them a bit, but quite honestly - large uniformly colored surfaces will be always problematic. It will simply hand works the MPEG compression. Add a bit of noise could help, but if not, you will have to live with this limitation.

Mylenium

Tags: After Effects

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