轉自
http://forums.divx.comPlayback: Video appears upside-down or mirrored
What causes this problem?
Windows platform media players typically use a system known as DirectShow to decode video files. As part of this system special filters can be installed, in order to handle additional video formats or add effects during decoding, for example. Unfortunately some filters can have undesired effects, such as inverting the video or commandeering DivX decoding from the genuine DivX decoder.
Upside down or mirrored video is commonly caused by these filters:
Bicubic resize filter
Filename: bicubic_resizer.ax
Installed as part of many codec packs, this filter is perhaps most responsible for inverted video.
G400 filter
Filename: divxg400.ax
Also installed as part of many codec packs, this filter can also invert the video.
XviD filter
Filename: xvid.ax
Again, installed as part of many codec packs, the XviD filter can decode DivX video as inverted.
How can I correct this problem?
To correct this problem, you can either uninstall these codecs using the setup program of the codec packs you have installed (if they allow this), or you can manually unregister the offending filters.
To determine which filters are affecting your system, please see this article.
To manually unregister the filters perform these steps:
Choose Run from the Start menu and enter:
command
then click OK
In the command window that opens enter:
cd \windows\system32
and press enter.
For each file you wish to unregister enter:
regsvr32 /u
For example, to unregister the Bicubic Resize filter enter:
regsvr32 /u bicubic_resizer.ax
