Doubts about IVTC...

[soniv]

When I´m doing my DVD2AVI project I get "Interlaced" as Frame Type, but the video type never stops to change from FILM to NTSC :confused: . Neither values go beyond 85%. So if I´m right I must not set Forced Film in DVD2AVI right? I leave the Field Operation as "NONE" and accordind to the guide I should perform IVTC later on in GKnot. (I forgot to mention, I´m using GKnot 2.6)So my question is : what is this IVTC all about? The only thing I have to do to perform it is check it in Gknot before encode and that´s it? What about my bizzare Video Type :confused: ? Why am I getting these values?
Thanx in advance! :)

[DJ Bobo]

It is OK if it's changing all the time, I got that on a Cowboy Bebop DVD.
Don't enable "Forced Film" in DVD2AVI and tick your IVTC button in GKnot and all will be fine.

[jggimi]

So if I´m right I must not set Forced Film in DVD2AVI right?Correct. I leave the Field Operation as "NONE" and accordind to the guide I should perform IVTC later on in GKnot.yeswhat is this IVTC all about? Telecined video has been converted from 35mm film to NTSC. A standard telecine will blend two fields from adjacent frames in order to bring the frame rate up to 29.97. You will see interlace artifacts in 2 frames out of 5. For more details, see www.doom9.org/synch.htm.

DVD2AVI uses the MPEG2 metadata to determine content, and Force FILM uses the metadata to do an IVTC for you. If you've used it before, it eliminates these extra, blended frames, and provides a project at 23.976fps. However, it needs both correct metadata and a standard telecine process.

In this particular case, the metadata cannot be used.The only thing I have to do to perform it is check it in Gknot before encode and that´s it?Almost. You also must either set the frame rate from 29.97 to 23.976 on the bitrate tab, or check the "IVTC -> adjust frame rate" on the DivX 5(or 3) encoding tab. I prefer changing the bitrate tab, 'cause it's a "set and forget" method. What about my bizzare Video Type :confused: ? Why am I getting these values?Either the metadata doesn't have matching information, or it was a non-standard telecine, or both. The content must be analyzed, frame by frame. It will slow your encoding process, so be prepared for a longer than usual encoding.

Clicking the IVTC check box will use the Decomb filter suite (Telecide and Decimate). I recommend you examine the .avs output prior to encoding, by opening it in vdub or a player that can let you move frame-by-frame. You can then make adjustments to the filters -- to see if it improves things, prior to encoding.

There is a help file for Decomb in the Gknot Docs folder.

[soniv]

ok, I´ve done it... The movie took eleven hours to encode.. man, it´s A LOT ! The image looks fine except for one detail. Do you guys know how the image looks like in DVD2AVI (when you start the preview)? Like, it has some horizontal lines, some kind of distortions... it´s not really hard, but it´s there. Just for the record, I´m not confusing with the black horizontal lines that are mentioned on the DVD2AVI projet guide. The lines are in the same colors of the movie, looks kinda weird, you know? The second thing I´ve noticed is that the final filesize is a lot smaller than it was suppose to be, I mean, I went for 2 cds of 690 Mb, and the output file has 1,1 Gb (I expected ~1,3 at least). Besides, i got some warnings in the encoding log, is that normal ? The warnings were saying that the number of counted frames were different from the settings, (I´ve left 29.970 fps at the bitrate tab and checked the IVTC checkbox in the Divx 5 tab).Other thing that should be remebered is that I got A huge drop on the bitrate during the encode. It fell from 2096 to 1674, but I think it´s due to the IVTC right? If any of you guys need the log file to analyze this case better, just let me know ok? i won´t post if it´s not needed, cos take a hell of space. But anyways, THANX A LOT for you help. :D

[DJ Bobo]

Attach a screenshot for us to see which lines you mean.

Your movie got smaller than expected because it is already saturated, that means it has already reached MAX quality and it can't got any bigger.

On the bitrate tab you have to set 23,976fps when your output is supposed to be 23,976fps (here because of IVTC), then you won't get the error message you got.

[soniv]

let me see if i got it right. to perform the whole IVTC process I must set the FPS to 23.976 AND check the IVTC option.Is that correct? I mean, it´s not enough if I just check the IVTC in avs box? Unfotunately, I´ve tried to make a print screen during the movie in full screen but when I paste I looks smaller, like normal size, and that horizontal lines I see are just viewable in fullscreen and normal size. In normal size, I don´t know why, the image looks ok when I paste in Corel Draw 9. I noticed that the problem agravates (although it´s there all the time) when things start to move faster in the movie, but when I press the print screen button, it´s like, the image freezes for one second and the computer capture it right, w/o the distortions. But I could post the shot I got in DVD2AVI. Well ít´s harder then what I got with Divx player but I´m sure it´s preetty much like it. Would it be useful?
Thanx a lot!

[DJ Bobo]

yeah, activate both 23,976fps and ivtc

If you're getting interlaced output in your DivX, that means IVTC wasn't done correctly (although it can't be perfect, just to let you know)

Post the content of your avs file.

[soniv]

oh shoot, I already deleted all the files 'cos the action scenes were awful. I´ll try to encode the whole movie again following all the instructions and see what I get. Btw, the movie is Jason X, it actually sux but it´s good as a challange ;)
Thanx again

[soniv]

I think I got a problem here... when I change the FPS to 23.976 the IVTC option gets unavaiable, so there´s no possible way I can enable it and choose 23.976 at the same time...

[DJ Bobo]

Hmm.. seems like GKnot has changed, I still have 0.23 and I don't use it (I just use it to tell crop values, nothing more).

Well, anyway, change your ivtc lines to the following:

LoadPlugin("...\ivtc.dll")
ivtc(44,11,95)

You find that filter (IVTC2.2) in the doom9 download page.
Keep in mind, that if you wanna use this filter, you have to delete the telecide & decimate lines (if you have them anyway) from your avs script.
If you want extra security (in 99% of the cases not needed), you may add the following after the ivtc line:

LoadPlugin("...\decomb.dll")
FieldDeinterlace(blend=false)

Keep in mind that adding this will decelerate the encoding session.

[jggimi]

[list=1] Open your .d2v project
Set the bitrate to 23.976
Select the IVTC option in the "Save & Encode" window
Ignore the "IVTC in avs -> adjust frame count" box on the encoder tab.
[/list=1] FieldDeinterlace is included in Decomb's Telecide.

[soniv]

ok, I´ve encoded the movie. The problem is the size. I went for 1 cd of 700 mb and got 590 mb. These movies are hard work aren´t they??:angry: I´ve done everything I was told and didn´t get it right !!! Can you guys tell me (again, I know. but this time all together.) step by step (asking too much already:D )how to proceed in this case. I want to give it another try, maybe something went wrong (hd space, for example). Is it possible??
thanx! :cool:

[DJ Bobo]

YOUR MOVIE IS ALREADY SATURATED AND REACHED MAX QUALITY AND CAN'T GET ANY BIGGER

For the 1000th time: http://forum.doom9.org/showthread.php?s=&threadid=24584

[jggimi]

@ Soniv

Do me a favor, would you, and copy and paste the .avs file into this thread? Remove the comment lines, first, of course.

That way, we can see how your encoding has been set up. We'll get all but the DivX settings.

Thanks.

@ DJ

Wow. You get as cranky as I do. :eek:

[DJ Bobo]

@ jggimi
cranky?! what does this mean? (you may translate to french or german :D)

[jggimi]

Sie erhalten so cranky, wie ich. Hmmm.... Vous recevez aussi d'humeur difficile que je fais.

[DJ Bobo]

It seems that you used some (idiot) automated translators, but hey! I think I understood: you mean nervous?
Yeah, sometimes. I think it's normal for "old rabbits" like you and me, that see the same questions every 3 days :D

[jggimi]

Yes, I use idiot automated translaters. I start with http://translation.langenberg.com -- it points me to many useless translation tools. They're all about the same.

[soniv]

1 - Chill DJ, the movie I mentioned on the last thread was Frequency. I´ve tried it because it had the same problem that I told you guys I had with Jason X. I´m preetty sure the movie wasn´t saturated, the image sux (btw, the movie is freezing)! ! ! But thanx...

2 - What was that thread in german/french all about? ? Wasn´t I supposed to understand? French is a lot more similar to portuguese than you think... :sly:

3 - If you got cranky with my questions man... All I can say is I´m sorry! I didn´t mean to bother anyone with that.:(

4 - Unfortunately I got so pieced off with the whole thing that I forgot to back up the .avs file again. I just got 3 DVDs and all of them have these same problems... I have to encode again and finally get the file...

sorry for making you guys cranky (damn, where did this word come from man?!?!?!) :D

Brazil, FIFA 2002 World Cup CHAMPION ! ! !:cool:

[jggimi]

The phrases in German and French were a rough translation of "You get as cranky as I do."

Since you're having a problem with multiple DVDs, you'll need to provide us with an .avs before we can add any insight into the root cause.

Re: Cranky...ADJECTIVE: Inflected forms: crank·i·er, crank·i·est
1. Having a bad disposition; peevish. 2. Having eccentric ways; odd. 3. Full of bends and turns; crooked: a cranky mountain road. 4. Working unpredictably; erratic: a cranky old truck. 5. Rickety; loose.
OTHER FORMS: cranki·ly —ADVERB
cranki·ness —NOUNSource: The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. :rolleyes:

And where did it come from?E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.

Crank.

An Abram man (q.v.). So called from the German krank (sickly), whence cranky, “idiotic, foolish, full of whims,” and cranks (simulated sickness). These beggars were called cranks because they pretended madness and sickness to excite compassion.

[DJ Bobo]

@ soniv
Sorry if it wasn't what it was supposed to be. But seems like you havn't seen the linked thread before anyway (therefore one point for me too, we're quit :D)
And because of the translation above: don't worry! I only undestood because of "humeur difficile", which doesn't exist but was pretty close to "de mauvaise humeur", which was my case as I replied earlier :D

@ jggimi
Even! because of the similiarity with the word "krank" in german (means "sick"), I was confused.