MencodeME, Forced Film, Interlaced, etc.

Prodater64 · #1 05-18-2004, 12:18 PM

Hi: When our source is an BIG VOB, the way to obtain it don't deal with what kind of source it is. We don't select PAL, NTSC or Forced Film, interlaced or not.
My question is:
Does MencodeMe deal, in the right way, with source format, no matter what kind of source is it?
What about interlaced or not?

Thank you.

vmesquita · #2 05-18-2004, 01:41 PM

No it doesn't. You have to tell it what to do.

(NTSC) If it's a hard telecined vob, you must select framerate 23.976 and IVTC.
If it's interlaced, you must select deinterlace with the correct field order. No interlacing encode support yet.
(NTSC)If it's soft Telecined you must select output 23.976
(PAL)You must select the correct frame rate and set the deinterlace options with the correct field order is needed.

Zyphon · #3 05-18-2004, 04:31 PM

Quote:

Originally Posted by vmesquita

(PAL)You must select the correct frame rate and set the deinterlace options with the correct field order is needed.

Some of my PAL DVD sources are interlaced how can I check which field order it is in?

Sorry for the dumb question but I havent got a clue lol.

vmesquita · #4 05-18-2004, 06:02 PM

There's an AVS script I got a while ago that helps finding the field order. Actually it's all I use when I need this info. I'll see if I can find and post.

Zyphon · #5 05-18-2004, 06:10 PM

Thanks Vinicius I would appreciate that.

bigggt · #6 05-18-2004, 07:15 PM

edit-wrong answer

bigggt · #7 05-18-2004, 07:23 PM

Actually i have a dumb question about this

Quote:

Originally Posted by VM

NTSC) If it's a hard telecined vob, you must select framerate 23.976 and IVTC.
If it's interlaced, you must select deinterlace with the correct field order. No interlacing encode support yet.
(NTSC)If it's soft Telecined you must select output 23.976
(PAL)You must select the correct frame rate and set the deinterlace options with the correct field order is ne

I don't know what hard and soft telecined is so this is what i want to knw

What would i choose if

i will show what i would do with avisynth ,dvd2avi

hollywood movie with forced film,what would this be in Mencoder

Hope this isn't too confusing

vmesquita · #8 05-18-2004, 08:00 PM

@bigggt
Hollywood movies are generally softelecined. In this case, set field operation to none and framerate to 23.976. This is the equivalent of forced Film in DVD2AVI. Hard telecined stuff is not very commom.

@Zyphon

Code:

function CheckTopFirst(clip v1){
global top_hits=1
global bot_hits=1
global text = ""
global text2 = ""
v1 = assumeframebased(v1)
global tff=assumetff(v1).separatefields().bob()
global bff=assumebff(v1).separatefields().bob()
istff = tff.subtitle("Is frame TFF: TRUE").frameevaluate("top_hits=top_hits+1.0")
isnottff = tff.subtitle("Is frame TFF: FALSE").frameevaluate("bot_hits=bot_hits+1.0")
outclip = conditionalfilter(tff,istff, isnottff, "yDifferenceFromPrevious(tff)+ydifferenceToNext(tff)","<","yDifferenceFromPrevious(bff)+yDifferenceToNext(bff)",false)
outclip = frameevaluate(outclip,"text = "+chr(34)+"STATS: TFF = "+chr(34)+" + string(100.0*top_hits/(top_hits+bot_hits)) + " + chr(34) + "%"+chr(34))
outclip = frameevaluate(outclip,"text2 = "+chr(34)+"STATS: BFF = "+chr(34)+" + string(100.0*bot_hits/(top_hits+bot_hits)) + " + chr(34) + "%"+chr(34))
outclip = scriptclip(outclip, "Subtitle(text,y=50)")
outclip = scriptclip(outclip, "Subtitle(text2,y=70)")
return outclip
}

Just save this as "checktopfirst.avsi" in your avisynth plugins folder. Every time you need to check field order, add checktopfirst() to your script and scan throught the frames in VirtualDub. This is intended mainly for captures.
If your dealing with a VOB, a much better way is get this info from the VOB. You can use ReStream, open the VOB in it and check if topfield first is checked.

EDIT: I don't remember whose I got this script from, unfortunatelly.

bigggt · #9 05-18-2004, 08:38 PM

Thanx VM

incredible · #10 05-19-2004, 02:56 AM

Also the most easy way in avs to find out fieldorder is:

Avisource("xxxxxxxxx-avi") # or mpeg2source("xxxxxxx")
AssumeTFF()
Bob()

Now do open it in Vdub and move in the movie frame by frame forward.
Is the motion ok? If not, means if you got a "back-and forth" effect, then you got a Bottom field first source

BTW: If you got a Telecined movie which (in regular) comes as 29.97 interlaced (dyamical field shifts), the use when inverse telecining in front of ivtc a softpulldown.

softpulldown,ivtc=1

Zyphon · #11 05-19-2004, 03:13 AM

Thanks VM for that script I really appreciate it.

Also thank you to Inc for your method also.

vmesquita · #12 05-19-2004, 06:20 AM

@Inc,

The script I posted does that for you and shows as a nice statistic in the screen.

cweb · #13 07-19-2004, 03:19 PM

Hi,

Just curious, what happens if you are using mencoder and avisynth, plus forced film in dvd2avi ? Is it possible? Or do you always encode without avisynth in this case?