recreate missing field - field lost in entire video

[Will Timbers]

Hi All,

I have video which was shot 50i but has lost a field. So I have vertical and temporal resolution issues.

There is a lot of discussion about de-interlacing and recreating missing fields, but mostly it seems that people are starting with progressive footage or at least 'complete' footage.

I have made various attempts with eedi2 and tdeint, but I don't seem to be getting noticeable results. Perhaps I am on the right path but have not hit upon the right settings.

I do not have access to the source footage and can't put the missing field back in. So I need to interpolate it... somehow!

I'm aiming to get back to 50i, without any of the temporal and vertical resolution problems I have at the moment.

Help and guidance appreciated

Will

[Didée]

Welcome to the forum. Alas, you are saluted with bad news.

An interlaced source has "half spatial" resolution, but "double temporal" resolution. The usual deal is this: the double temporal resolution can be used to puzzle-together the spatial domain to "full resolution" again.
But since your source is missing one field, you don't have the "double temporal", but only the "single temporal" resolution. Thus, the information needed for "re-creation" is already missing. In a word: Dead Road.
(A bit more technical: even and odd fields are of different phase, and the two different phases can be re-combined, more or less. But when either top field or bottom field are missing completely, then you don't have two different phases anymore. Only one phase is left.)

There is a last ressort, by using NNEDI2/3 to double the spatial resolution, followed-up by motion interpolation via MVTools (MFlowFPS). This way you can "construct" both full spatial resolution and full temporal resolution. However, this is not "re-creation". It's merely "artificial guessing", and the result most probably will include funny artifacts. (Due to motion interpolation, which is way more difficult than one might imagine at first glance.)

[Will Timbers]

Didée! I feel honoured, I'm just reading about your good work in this thread http://forum.doom9.org/showthread.php?t=133826 trying to get my head around it!

I thought it might be a dead road :-( But I am happy to give "artificial guessing" a try, I shall make some tests, thank you for the advice.