DV DeInterlace issue

[idanm19]

hello!

I use avi synth to seperate fields for my dv interlaced avi source, then I compress it with VDub to xvid using anti bob filter,
then I get from 720x576 a 720x288 avi, that I need to resize while playing.
I want to change the aspect ratio of the avi (losslessly if posible) in order to tell the player to play it in double the vertical resolution,
any ideas ?

thanks!

[defaulk9]

depends on what player you're using. If you are using something like Windows Media Player, try BSPlayer. Then just choose 4:3 as your aspect ratio instead of "Original"

[idanm19]

I'm using media player classic, and I can resize it during playback, but I want to make it permanenet, as if when I open the avi, no matter in what player it will show it correctly.
It might be possible to do it with some avi header change or something?

[scharfis_brain]

why are you deingt this heigth halfing?

avisynth has an internal bob() filter
and also ekternal plugins, that provide motion adaptive deinterlaching, like
leakkerneldeint.dll
and
tdeint.dll

[bb]

Originally posted by idanm19
[...]I want to make it permanenet, as if when I open the avi, no matter in what player it will show it correctly.
It might be possible to do it with some avi header change or something?
As far as I know there's no working aspect ratio support in AVI files, neither for DAR (display aspect ratio) nor for PAR (pixel aspect ratio). You can achieve what you desire by using another container, e.g. Matroska.

bb

[communist]

There is - its just that it isnt properly supported / implemented AFAIK. Even the default WinXP DV Codec does it when you open a DV avi it automatically resizes 720x* to 768x* so that it is 4:3 again.

XviD's AR is stored in the video bitstream and with the right configuration the DShow filter will resize during playback properly as other DShow filters do (for MPEG2 for ex.).

But as scharfi said I would 'propererly' bob-deinterlace the avi and encode it - unless you're happy with the low vertical resolution and bit-rate saving you achieve with it.

[idanm19]

I didn't deinterlace it cause as far as I can tell when I resize the movie I got I see better image quality and it's smaller then the one I get with smart-deinterlace for instance.

you guys always deinterlcae your dv before encoding to xvid/divx?

anyways, is there a way to compress interlaced source properly without deinterlce it? so the encoder would encode the fields seperately to get better filesize/quality ?

[bb]

Originally posted by communist
There is - its just that it isnt properly supported / implemented AFAIK.
That's why I wrote working aspect ratio support :)

Originally posted by communist
Even the default WinXP DV Codec does it when you open a DV avi it automatically resizes 720x* to 768x* so that it is 4:3 again.[...]
Well, it does not properly resize to 1024x* when playing back in WMP and the source is 16:9, so there must be something weird with the AR handling...

bb

[bb]

Originally posted by idanm19
[...]you guys always deinterlcae your dv before encoding to xvid/divx?
No, I use progressive sources :)

Originally posted by idanm19
anyways, is there a way to compress interlaced source properly without deinterlce it? so the encoder would encode the fields seperately to get better filesize/quality ?
XviD and DivX have had interlaced encoding support for several versions already.

bb