mjpeg fields help

[mrtj1]

my problem is that when i encode my caps to divx, since i use deinterlace to blend the fields together, the quality is great but not when there is motion. there is some blurring like the fields are not aligned properly or something. i tried using duplicate field 1 or 2 and discard field 1 or 2. this makes the motion problem dissapear,, but the quality is not as good overall.

i checked out smart deinterlace and that lets you 'blend instead of interpolate in motion areas' but that gives me the worse of both - low quality throughout and then the blend makes the motion blurry. is there a way around this - like interpolating in motion areas, but blend throughout the rest or something?

please help.

[zeb7]

Hi mrtj1

First filter;
Smart deinterlace (interpolate in motion)

Second filter
Rescale - 352 x 288 pal / 352 x 240 ntsc (must be half height to work)
or
blend the fields together ( if you want to keep high resolution)

if you want to rescale to an unusual size , you will need to blend the fields together in the 2nd filter
and have a 3rd filter for re-scaling

Q ; is you source VHS or directly from cable/satellite

[mrtj1]

i connected phono video cables direct from my digibox to the marvel box.

i cap to 704x576,

what i used to do then was null transform to crop the black bars off the left and top edges,

then blend fields together,

then resize to either 640x480, or 740x570 for full screen eps that are 1 per cd.

thanx for the reply. any other suggestions?

p.s.

i also have picvideo mjpeg installed just in case that makes a difference since i think that takes over from matrox's one

[zeb7]

Deinterlacing or blend looks good a PC and may fit you're needs ,but have you tried interlaced Divx3 encoding ?
On a g400 playback is prefect .(i assume you're using a g400)
The Dualhead Clone , DVDmax settings are ;
pal
Always scale to full screen
all 3 box's UNchecked

I think these setting get swapped about in different Driver versions
these settings work with Revision 6.28.017 PowerDesk

For correct playback the Divx 3.11 to 3.20 AVI file must be 704 x 576

Divx 4 has slow playback on my setup (a bug) but it can also encode interlaced video

[mrtj1]

i do have a g400, but if i make the clip into 704x576 then i get black bars on the left and right side and the image is squashed which is why i make it 720x540 (wrong size in previous post) which fills the screen up properly.

i prefer the 4th codec to the 3rd - the quality is better i think.

where do you find the dvdmax settings?

you mentioned divx4 and interlacing. what kind of results are you likely to get with choosing 'deinterlace' in the encoding options of divx4?

also, with the picvideo mjpeg codec, what are the best setting to use on that to get the best quality? there are options there like '2 fields if more than ... lines' etc

how much of a diff do they make?

[zeb7]

the dvdmax settings are in Control panel / Display / setting (TAB) / advanced (Button) / Dualhead (TAB)

I have not used the deinterlace filter in divx4 , my think is its a "blend the fields together" filter.

in pic mjpeg the setting "2 fields if more than" should be 566 for PAL and 479 for NTSC
That setting makes the codec split a 704 x 576 into two 704 x 288 frames (mpeg2 and DVD work in the same way)
but if you sent the code a 352 x 288 or a 720 x 540 it will encode the frame as one frame , which would be be ok
because you deinterlaced the 720 x 540 clip already

[mrtj1]

thanks man. the avi does look better now. i'll try the picvideo thing next time i cap.

[zeb7]

I made a mistake last night , a 3rd filter is not necessary.

First filter; Smart deinterlace (interpolate in motion)
Second filter Rescale - 720x540 (you're chosen resolution to fix the aspect ratio problem)

Also for improved quality you should use a newer vision of virtual Dub with interlaced check box
in the resize filter this stops vertical blurring, use the "show preview" button to see if it has the right
effect for you're clip.
The new problem will be the larger AVI filesize because of the clearer picture quality
( a blured picture would compress easier/smaller filesize )

The aspect ratio problem seems to be a AVI format limitation , mpeg1/2 has a playback aspect
ratio setting and the matrox mjpeg displays 4:3 aspect ratio correctly.

Their is a playback aspect ratio setting with divx4 (play a divx4 and click properties / advanced )
?? Hmm.. at last it was there in one of the beta builds ??? anyone know where its gone
I haven't tested it but am sure the divx programers will have that working soon so you shouldn't
need to rescale to correctly display 4:3 on a 1:1 pc monitor

I think Zoomplayer can correctly display 4:3

[mrtj1]

i tried it but without the blend fields, the quality is a lot lower.

the best quality i can get so far is

crop
smart deinterlace 1.7 (no check boxes ticked at all)
deinterlace (blend fields together)
resize
--

without the deinterlace and field blending it looks very poor.

[zeb7]

I didn't think you would want the extra blurring
the blend fields together makes , with the video
coming off a digibox but ,Stay with you're best option

[mrtj1]

i captured roswell off bbc2 yesterday and the end divx looks like a dvdrip. MUCH better quality than i had before.

thanks for the info.

one last q tho, in my digibox i have the setting to show widescreen movies in letterbox because if i didnt it would fill the screen but would be squashed. if i captured that and resized it would it be better quality than capturing from widescreen?

[zeb7]

Yes ,Its the same format used on "Anamorphic" DVD's

Reasons why it will look better;
1 most DVD players (and highly likely didibox's) use a bilinear resize filter
to squash the picture so it's right for 4:3 TV
2 The weakest part of the setup is the A/V cables so squashing the picture
after its been though the A/V cables , makes a picture with lower noise

When i make VCD/SVCD/DIVX/DVD 's i keep the 16:9 transfer and press the
16:9 button on the TV to correct the aspect ratio

[mrtj1]

can i do something like that with divx? encode so that the actual size is 4:3 but when you play it back it resizes it to 16:9? or will i have to encode it to the size i want to play it?

[zeb7]

Yes the "playa" that came with DIVX4

Right mouse button video/AR/16:9

Or Ctrl + 2 for 4:3
Or Ctrl + 3 for 16:9

Remember you screen must be in at least 1024 x 768 to keep the quality

[mrtj1]

yeah, it's 1600x1200