newbie question: deinterlacing

[LC1104]

Can someone please describe what interlacing and deinterlacing is? I have no clue what either words mean. Also, can someone help me with the following problems i have already posted: I get an error message when I try to encode audio data to mp3 or other codecs. I´m using the MPEG-4 DivX codec but just can use uncompressed audio with it. The files consists to 70% audio and 30% video data. Is there a solution for that or am I the only one with this problem?

AND

When i record with pc-vcr, sometimes, for example, in a 30 min clip, there will be a two minute segment in the clip that goes kind of blank with messed up video at the top and then is normal throughout the rest of the video after tose two minutes. However, the sound is fine. I have the morgan codec. Should i reinstall the matrox codec?

[DrMordrid]

Interlaced video is what is currently used by TV broadcasters, cable and on video tapes & DVD disks. It is a built in property of both the NTSC and PAL video systems.

A single frame of interlaced video is made up of horizontally scanned lines. These lines are scanned out of order. Odd lines first, evens after the odds are done; 1, 3, 5... then 2, 4, 6....

This gives each interlaced video frame two distinct "fields", alternately known as Odd/Even or A/B. It takes both fields to create a single video frame.

For frame (aka: non-interlaced or Progressive Scan) video the lines are scanned in order; 1, 2, 3, 4, 5, 6.... Frame video is used in video destined for display on computers and is part of the HDTV specification.

De-interlacing attempts to convert a frame with interlaced fields into a non-interlaced frame. This can be done by different methods. There are problems with all the methods, but for now we're stuck with 'em.

Using the Morgan codec is fine for rendering clips in the editor, but when playing back video it's far better to use the Matrox hardware codec. Any clips rendered with a softcodec should have data rates matching the hardware codecs capabilities. It's just plain faster and less likely to exhibit speed related playback problems.

Alternatively and if you have a fairly fast processor (400 mhz plus) the freely licensed PICVideo MJPeg codec is much faster than Morgan. It's at http://www.jpg.com

Dr. Mordrid


[This message has been edited by DrMordrid (edited 27 April 2000).]