The Video Compression Sub-Menu; The Video Compression Expert Settings - Miglia AlchemyTV User Manual

3. The Video Compression Expert Settings menu may be familiar to you. It is a standard
QuickTime window you may have seen in other applications. It enables an advanced control over
the QuickTime codecs.
Some Codecs may have advanced settings available under the codec list. This is notably true for
MJPEG and some third-party codecs.
This codec list can be expanded by installing third party codecs like DivX and 3ivX. Note that no
third party codec is supported at the time of this writing, but DivX and 3ivX have produced some
good results in early testing. Please review http://www.miglia.com/Support/alchemytvdvr.html
for updated information.
Via the Motion sub-menu, you can select the number of frame per second that should be
recorded. The 'Best' option will automatically set the fps value at the maximum possible and is
recommended.
You can force the software to create a 'key frame' at a given value. Unlike normal frames, a key
frame is not based on the previous frame and will increase the overall quality of your video.
Having more key frames increases the size of the captured video.
It is possible to increase the compression rate of your video by limiting the data rate. Note that
picture quality will suffer if the value is set too low. This value affects only the video track, not
the audio track, there fore the final size of your movie will always exceed datarate x length of
recording
AlchemyTV DVR™ User Guide
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