以下摘自HFX帮助文件，希望对你有用：

Now add a video clip to Source 3 so that the background is no longer black.
To add a viideo clliip to Source 3:
Click on the Host Video 3 media item in the Control panel.
Click on the Select File button.
Using the file requester, select a video clip to use for Source 3.
Click on the Play Once button in the Monitor window.

You have selected a new video source and should be able to see it in the
background as Source 1 flips over to Source 2. You should also make sure the field interpretation is correct for this video.

To change fiielld Interpretatiion:
Click on the Interpret popup, and select the proper field interpretation for your video.
For most video capture cards you will select Interlaced – Upper First or Interlaced – Lower First.
While correct interpretation is not important in the preview, it will be important for
final rendering. If interpretation is not set correctly, the video in the background
will playback incorrectly (it will jerk rather than playing smoothly).

From now on, when you select a video file, the Interpret value will be defaulted to the last option selected. You will only need to change Interpret if you select a
single image file, or video captured using a different video card.



Troublleshootiing

My video editor crashes when I try to use Hollywood FX.
This usually indicates a conflict with your 3D graphics card. You should download
and install the very latest drivers for your graphics card.


When I select video or images in the Media Options panel I get a white
object instead of video.
Generally this indicates you have run low on memory. If you are doing
MultiWindow effects with more than 3 video sources, you should have a minimum
of 128 MB of RAM (with at least 256 MB highly recommended). If you are using
images you scanned in, you should lower the resolution of those scanned images.

马马虎虎能看懂一些，最好解释一下，谢了

OK，下星期一给出！

还是不行啊
出现media not available的字样
请叫天堂鬼火

安装完，添过注册码后，还要再注册一下，

需要你的注册码和机器的ID，

不是翻译了么？！