Honored Contributor
Honored ContributorIt's not necessarily a downside, it just depends on what type of interlacing you want to perform. Dropping every other line is more true to the way classic systems interlaced the video. Remember interlacing was created because video capture and display devices were not fast enough to perform at 60 progressive frames per second.
The other alternative is to actually de-weave the data which requires a frame buffer. In this case you read out every other line, then go back and read the unread lines from the same frame. Interlacing using this method has some benefits. Primarily, if it is de-interlaced at the receiver using a weave algorithm, you get the original image back exactly. Also, it means that your progressive frame rate (ahead of the interlacer) does not have to be 2X the output frame rate. This can put less pressure on components ahead of the interlacer. Jake
