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KDVD: Poor quality on sports programs, even with simple AVS

I am converting some dvb captures of hockey to dvd. However no matter what avs filter I seem to use, the panning of the camera and fast-moving players cause wobbly legs / flickering doubles, horizontally. This happens along the boards/glass and the players as they skate. Very distracting.

The original captures being transport stream mpeg-2 do not have this problem of course.

I have tried vmesquita's kdvd filters, and thought one of the filters might have been causing it so I did a simple script like this:

movie="hockey.d2v"
MPEG2Source(movie)
GripCrop(352,480)
GripSize(resizer="BicubicResize")
GripBorders()
converttoyuy2()

Using tmpg I kept cq at 100. Still, the horizontal flicker.

I thought by using the minimum amount of script and keeping it 100%, the problem would be gone but apparently that doesn't solve it.

Would anyone have any suggestions on filters that might fix this, or a different procedure to use? What would be causing this if not the AVS? I also tried the CCE demo and it did the same thing.

Thank you,

gosens

Hi gosens,

Because you are encoding live sports, they were probably shot "VIDEO". Not FILM.
So you are encoding at 29.97fps Interlaced, instead of 23.976fps, right :?:

-kwag

Thanks for the quick response, kwag... yes it was encoded at 29.97 NTSC, interlaced, 352x480, 4:3, and 2500 kbps.

Any other suggestions appreciated...

thanks

Quote:

Using tmpg I kept cq at 100. Still, the ...

In which mode you're encoding??? I assume mpeg2!! or not???

Quote:

Originally Posted by incredible

In which mode you're encoding??? I assume mpeg2!! or not???

yes of course, mpeg2. using TMPG encoder or CCE, the same thing happens. Has anyone out there successfully encoded sports?

Seems to me like encoding using the wrong fieldorder.
Try one sample using bottom field first.

I have solved the problem! After digging through the forums I tried de-interlacing, and it seems to have done the trick with only a little loss of picture quality (a touch blurry).

FieldDeinterlace(blend=true)

Thanks to kwag and incredible for their suggestions. Incredible - I didn't try your field order suggestion (don't know how anyhow) but the de-interlacing worked so all is well.

gosens

BUT if you got a 29.976 "VIDEO NTSC" interlaced movie ... you shouldn't only deinterlace it, also do a conversation to 23.976 FPS! By this you get a real 23.976 "FILM NTSC" progressive compatible movie and it still looks very fine! Cause encoding at 29.976 needs to much bitrate.

This here IS NOT INVERSE-TELECINING! It just treats the "real" 29.976 FPS so that they become no stuttering/jerky but smooth motion looking 23.976 FPS. Just to avoid misunderstandings.

So use this script

Code:

MPEG2Source("hockey.d2v")

FieldDeinterlace(full=false) # or other prefered de-interlacers

convert60ito24p(2,0) # This calls the function below!

GripCrop(352,480) 

GripSize(resizer="BicubicResize") 

GripBorders() 

converttoyuy2()

# 

############### the function ############# 

# 

function convert60ito24p (clip video, int mode, int offset) 

{ 

work = assumefieldbased(video) 

out = (mode==2) ? interleave( 

\selectevery( 

\layer(trim(work, 1, 0), 

\layer(work, trim(work, 2, 0), "fast"), 

\"fast"), 5, 0 + offset), 

\selectevery( 

\layer(work, trim(work, 1, 0), "fast"), 5, 3 + offset)) : 

\    (mode==1) ? interleave( 

\selectevery(trim(work, 1, 0), 5, 0 + offset), 

\selectevery(layer(work, trim(work, 1, 0), "fast"), 5, 3 + offset)) : 

\    (mode==0) ? selectevery(work, 5, 1 + offset, 4 + offset) : work 

assumeframebased(out) 

} 

#################################

In Fielddeinterlace() I would recommend also to use full=false, so only the combed(moving) parts of the movie will be de-combed!
BTW blend=true .. is also in the default of fielddeinterlace() so it's not needed to be set in the command.

You also can safe this function alone as a "convert60ito24p.avsi" to your AVS2.5x Plugins folder (beggining at the line "############### the function ############# ")
So it will be avaiable everytime you start a script and its just needed to give your Script the command as shown above without everytime copy/pasting the whole function to all your scripts.

convert60ito24p(2,0)

Thanks incredible, I'll try that tonight.

I'm still new to avs filters so now that i'm through the first step of getting the file converted in a satisfactory condition with a fairly simple script, i will start learning about the filters to try to increase the quality while decreasing the file size and encryption times.