Deinterlacing video can be a tricky situation, especially with the numerous interlacing/deinterlacing filters available in Avidemux. This guide is here to offer you some help in deciding which filters are better for you, and how you should them.
Simply put, interlacing is a technique for storing frames of video in halves split between separate images. The picture is broken into multiple lines and the odd lines go to one frame, while the even lines go to the other frame. This is called interlaced video. If you do not properly deinterlace your video, the video pictures may look weird or at worst, be broken.
For DVD video, a good general purpose deinterlacing filter is Decomb Telecide. You will need to select a Strategy type from the pulldown menu. Selecting “No strategy” will effectively remove any interlaced lines and result in a proper picture. This is recommended by default, other options are appropriate sometimes. See that article (or below) for more detailed information about that filter.
If the source video is 29.97(nbsp)fps (or 30(nbsp)fps), and you want to keep that framerate, then all you need to do is deinterlace the video with Decomb Telecide and nothing else.
If the source video is 29.97(nbsp)fps (or 30(nbsp)fps), and you want to transform it to 23.976(nbsp)fps (or 24(nbsp)fps), do the following:
Deinterlacing of video internally within MythTV is not always the most effective or the highest quality choice. Sometimes it is better to leave your video recorded in non-deinterlaced form and then deinterlace it in Avidemux using a more specialized and powerful filter. The video filter Yadif with default settings works very well in most situations.