DV DeInterlace issue

idanm19 · 15th May 2005, 19:01

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 · 17th May 2005, 17:58

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 · 17th May 2005, 18:12

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 · 17th May 2005, 18:21

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 · 17th May 2005, 20:14

Quote:

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 · 17th May 2005, 23:06

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 · 18th May 2005, 05:36

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 · 18th May 2005, 09:23

Quote:

Originally posted by communist
There is - its just that it isnt properly supported / implemented AFAIK.

That's why I wrote working aspect ratio support

Quote:

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 · 18th May 2005, 09:26

Quote:

Originally posted by idanm19
[...]you guys always deinterlcae your dv before encoding to xvid/divx?

No, I use progressive sources

Quote:

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

15th May 2005, 19:01	#1 \| Link
idanm19 Registered User Join Date: Apr 2003 Location: Israel Posts: 48	DV DeInterlace issue 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!

17th May 2005, 18:21	#4 \| Link
scharfis_brain brainless Join Date: Mar 2003 Location: Germany Posts: 3,655	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 __________________ Don't forget the 'c'! Don't PM me for technical support, please.

17th May 2005, 17:58	#2 \| Link
defaulk9 Registered User Join Date: Feb 2005 Posts: 59	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"

17th May 2005, 18:12	#3 \| Link
idanm19 Registered User Join Date: Apr 2003 Location: Israel Posts: 48	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?

17th May 2005, 23:06	#6 \| Link
communist Registered User Join Date: Jul 2003 Posts: 1,152	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.

18th May 2005, 05:36	#7 \| Link
idanm19 Registered User Join Date: Apr 2003 Location: Israel Posts: 48	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 ?