converting "bottom field first" to "top field

[byteguy]

Almost all of my Mpeg2s are from a sources that encode with "top field first." Of course, one program (Proshow) encodes "bottom field first." This is causing me problems when I try to include that output with others in my NLE.

Does anyone know of a way to re-encode an existing file to "top field first" without creating flutter around motion?

[canadateck]

www.videohelp.com/tools?tool=Pulldown.exe

[upshot]

there is also restream

[dphirschler]

Correct me if I am wrong, but using either of those two programs would just simply change the field order, but not the video. Seems like one would have to split the fields, add a blank field to the beginning, then re-weave them. And then change the field order. An AVIsynth script should do the trick.


Darryl

[byteguy]

there is also restream

I talked to the author of Restream. He says that his program just changes the flag (for when it's set wrong) and would not actually fix the encoding in the file.

I'll give PullDown a shot but the page says it can be used to "modify most of the relevant MPEG-2 flags" which makes me think it's the same kind of tool.

I don't want to just modify the flag. I need to change it to a true "top field" file so it will mix well with other files.

[byteguy]

An AVIsynth script should do the trick.

Sounds like a good plan. Problem is I have NO idea how to do that. Any AVIsynth experts out there looking to show how impressive they are?

[BJ_M]

any high quality NLE can handle both TFF and BFF in the same project ...

that is - any HIGH quality NLE,

if you have it -- procoder can swap (truly change - not just the flag) the fields , so can TMPGENC (and save to avi)

also there are filters for avsynth and v-dub