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Windows Media Encoder has three deinterlace filters. The filter used depends on the difference between the input and output frame size and frame rate.
This is the default filter used when you select the deinterlace option. This filter blends the even and odd fields of an interlaced frame to create a progressive frame, as shown in the following diagram (not documented in this release).
This filter is used when the number of lines specified for the output video is half (or less) than those of the input video. For example, this filter is used when the resolution of the input video frames is 640x480 pixels and the output resolution is 320x240 pixels. This filter uses an algorithm that blends the fields, rather than simply removing one field of data. This results in higher-quality output video.
This filter is used when the number of lines specified for the output video is half (or less) than those of the input video and the output frame rate is twice as high as the input frame rate. This filter produces a frame from each field of the video sequence, as shown in the following diagram (not documented in this release).
The benefits of this filter are that it produces high-quality progressive frames because there is no need to blend information across fields. In addition, the full motion of the interlaced fields is maintained. However, this filter has higher performance and bit rate requirements.