convert fields into 50fps vertical half frames & back

[l.pandit]

Hi,
Need help here

I want to convert 25fps dv video into 50fps HALF resolution video. (NOT FULL RESOLUTION).
i.e convert 25fps fields video (720 X 576) into 50 fps (720 X 266). and after post production back to 25 fps field video.

I tried virtualdub's bob filter but it convets (720 X 576) 25fps video into 50fps (720 X 576). I want it to convert into 50fps (720 X 266).

Can anyone help.
Please

[Megahurts]

Using Avisynth:

DirectShowSource("path\file")
SeparateFields

Save as an .avs file and open with VirtualDub. It will see it as half vertical res and twice the fps.

[jagabo]

In VirtualDub use the Deinterlace filter. Choose the Discard Fields and Double Frame Rate (TFF or BFF) option.

A word of warning, with interlaced YV12 video (from the MPEG 2 source filter for example) VirtualDub does not handle the chroma channels correctly. Convert to YUY2 or RGB first. Or just use AviSynth.

[Gavino]

I want to convert 25fps dv video into 50fps HALF resolution video. (NOT FULL RESOLUTION).
i.e convert 25fps fields video (720 X 576) into 50 fps (720 X 266).

I guess you mean 50fps 720 x 288.
I would use Avisynth as suggested by Megahurts.