Virtual VCR



Virtual VCR
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Virtual VCR A Note On Pre Filtering

Packaged Filters
There are a number of Direct Show filters that come with the Virtual VCR application, see the following page for a list and more information.

Packaged DirectShow filters

Pre Filter Notes
It is possible to add Pre Filtering to the capture graph in Virtual VCR, this allows you to add any installed video DirectShow filters to the capture graph between the capture filter and the Smart Tee filter.

This means that any filter added also effects the Preview as well so you can see what effect the filter had to the video in real time.

In nearly all situations it is better to do any filtering needed after you have captured the video footage, it is possible to do some cropping using the Video Crop DirectShow filter available as part of the Virtual VCR but apart from that due to performance it is best to do all filtering after the capture. If you really need to add a filter for pre filtering then you can do so using this feature.

Please Note:
When adding filters it is important that you know what type of filter you are adding, if the filter can only work on certain colour formats the intelligent connect feature of the DirectShow architecture will add the appropriate colour converter to your FilterGraph. This can have some disastrous effects to performance and quality.

If you add a filter that only accepts RGB24 and the capture format is set to YUY2, the FilterGraph will add a colour space converted to convert from YUY2 to RGB24. This will cause performance issues and percussion issues.

To see what filter graphed has been built connect to the running app using GraphEdit and look for colour space converters etc. that should not be there. Logo