newbie question: difference b/w frame mode and progressive encoding of interlaced video

Hi,
  Is there any difference in encoding of an interlaced video in the
following 2 ways:
1. just considering it as a progressive video and doing a progressive
encoding.
2. doing a frame encoding.

Again, field encoding is just matching fields instead of full frames,
of an interlaced video, during motion estimation. Is that a correct
explanation I am having? Please correct me if I am wrong.



Thanks in advance....

jag

jagadeeshbp@gmail.com wrote:
>   Is there any difference in encoding of an interlaced video in the
> following 2 ways:
> 1. just considering it as a progressive video and doing a progressive
> encoding.
> 2. doing a frame encoding.

Since a frame encompasses both interlaced fields, both of the options
you listed do exactly the same thing.

If you have a truly interlaced video, it is almost always better to
treat each field seperatly, as the correlation between regions in the
same field is higher than that across both fields interlaced into the
same frame.  Remember, each field is a different point in time.

> Again, field encoding is just matching fields instead of full frames,
> of an interlaced video, during motion estimation.

It depends on the encoding method.  Some do more, some do the same,
some do less.