Artifacts in video

kidvid7 wrote on 11/27/2001, 2:44 PM
I'm getting artifacts showing up in an asf video file Using Vegas Video). The video begins with a still graphic (color gradient, corp logo) and then fades to the video. The still graphic gets little flaws, or almost artifacts, after a few seconds. This is in the final encoded piece, not the realtime version.

I can't change the graphic, as it's the clients corporate logo. I've tried .bmp, .jpg, .gif and .png formats and they all do it. If I substitute a simpler graphic it doesn't happen. Any suggestions?

Comments

SonyEPM wrote on 11/27/2001, 3:11 PM
.asf (and the spawn of .asf, .wmv) are highly compressed formats, and artifacts are a fact of life whenever you compress heavily. You might consider upping the bitrate- that will cut down on some (not all) of the compression artifacts.
Cheesehole wrote on 11/27/2001, 9:48 PM
if the logo is holding still for a while, most of the artifacts should be minimized over time. then when the fade starts to happen, you should see them come back. make the fade transition shorter, to limit the amount of time that the entire frame is changing (compressors hate that).

the bitrate might be your real problem though, you should get decent results with a still shot.

also certain colors will tweak out the compressor when they are up against certain other colors. there isn't much you can do about that though, unless you can change the gradient color or the logo color.

- ben (cheesehole)