Deinterlacing Understanding

[danube100]

Hey Guys wanted to know that what does deinterlacing means and how do u know dat the suggested deinterlacer by megui is correct or wrong and if its wrong how to know that which deinterlacer needs to be used.........


its a request plz do not provide me links of other sites as i want to understand with the help of any member and one or two samples with wrong deinterlacer and the correct deinterlacer used by the member....in other words plz explain with a help of example.....

[Blue_MiSfit]

:search:!!!

Deinterlacing means to convert truly interlaced video (i.e. live TV, sports, newscasts, some documentaries) into progressive video.

Interlaced video allows you to double the motion fluidity of a given frame rate. For example, the NTSC standard uses 29.97fps, but due to interlacing it can transmit 59.94 pictures per second. This is a trick that takes advantage of the human visual system, specifically "persistence of vision". The effect only really works on a CRT (tube) TV. All other devices like LCDs etc.. are inherently progressive, and interlaced video must be deinterlaced to be viewed on such a progressive display.

You can do this one of two basic ways - either same rate (aka "deinterlace") or double rate (aka "bob deinterlace", or just "bob"). Single-rate preserves only half the motion - i.e. it outputs 29.97fps in the case of NTSC. Double rate / bobbing preserves all the motion fluidity, and outputs 59.94fps in the case of NTSC. The downside to bobbing is 59.94fps is more information to store than 29.97fps.

There are many many approaches to both methods, each with their own merits. Some excellent deinterlacers for AviSynth (an incredibly useful tool that lots of people here use) are TDeint, YADIF, TempGaussMC, MCBob, and several others.

Again, :search:!!!!! and do some experimentation.

I hope my explanation helped.

~MiSfit

[Inspector.Gadget]

danube100, this is at least the second time you've made a post specifically disclaiming any intent to do your own research. This is a poor use of other forum members' time.

[danube100]

danube100, this is at least the second time you've made a post specifically disclaiming any intent to do your own research. This is a poor use of other forum members' time.

I am really sorry abt dis but its like i dont know exactly to what to search for and i thought there would be someone who could explain.....plz forgive me...

[Blue_MiSfit]

Try searching for "deinterlacing" on google, and you will learn a lot.

http://en.wikipedia.org/wiki/Interlaced

http://en.wikipedia.org/wiki/Deinterlacing

Start there.

Geez... was that so hard?

Try posting with a bit better grammar too... slang is quite difficult to understand, especially for folks who speak another language.

~MiSfit

[saint-francis]

Give over guys. He has a valid question and he very well might not know where to begin. He posted in the newbie section even! It's a difficult topic and there is no good singular source of information on it. He could spend days and months using the search function and have more questions than when he began. It's not so hard to give some good simple information. Searching for "deinterlace" here will give thousands of hits, most of which are completely unintelligible to someone who doesn't even know the basics yet. Newbie whitch hunts aren't going to help anyone.

[Groucho2004]

Give over guys. He has a valid question and he very well might not know where to begin. He posted in the newbie section even! It's a difficult topic and there is no good singular source of information on it. He could spend days and months using the search function and have more questions than when he began. It's not so hard to give some good simple information. Searching for "deinterlace" here will give thousands of hits, most of which are completely unintelligible to someone who doesn't even know the basics yet. Newbie whitch hunts aren't going to help anyone.

There is a difference between a newbie seeking help and a complete moron.
The links which Blue_Misfit provided are a very good starting point and even have references to other sites. The information is there and available.
The OP seems to think that there is some magic way to filter the information into his brain.

[danube100]

There is a difference between a newbie seeking help and a complete moron.
The links which Blue_Misfit provided are a very good starting point and even have references to other sites. The information is there and available.
The OP seems to think that there is some magic way to filter the information into his brain.

its not a thing abt being moron.....put ur self in my position and den say......i just started ripping a month back....so wats wrong if i ask some questions u know......doom9 is meant to help new rippers and old rippers but not to waste their TIME.

[Groucho2004]

its not a thing abt being moron.....put ur self in my position and den say......i just started ripping a month back....so wats wrong if i ask some questions u know......doom9 is meant to help new rippers and old rippers but not to waste their TIME.

There's nothing wrong with asking questions. I was in your position a long time ago and I started searching this site and others including Google. That's how you gain knowledge.

For crying out loud, the INTERNET is at your disposal, start using it!

[danube100]

There's nothing wrong with asking questions. I was in your position a long time ago and I started searching this site and others including Google. That's how you gain knowledge.

For crying out loud, the INTERNET is at your disposal, start using it!

i have already searched it but if i am unable to find what i am looking for den its something different and i never complained abt the links i got...dey are pretty useful...i was looking for kinds of links....

[CWR03]

i have already searched it but if i am unable to find what i am looking for den its something different and i never complained abt the links i got...dey are pretty useful...i was looking for kinds of links....
You aren't helping your case when you continually use lazy slang appreviations like "wat," "dey" or "den" instead of going to the trouble of typing one more letter and turning it into an intelligible sentence, especially when it was pointed out to you politely that it makes understanding your posts easier for non-native English speakers to understand. It's also been pointed out to you here and in other threads like this that you have to put forth some effort in learning instead of expecting others to hand feed you everything.

To answer your original question: you know when the wrong deinterlacer was used when the end file doesn't play back properly. Experiment and learn, and the answer will come to you, unless you plan to post a sample of every file you encode to let someone else see if it's right.

[TwoToad]

I thought Blue Misfit's first post was very informative. It helped me understand a few things that I didn't understand at first. This may have been a subject that has been beat to death in the past, but sometimes if things are worded differently, it makes something "click" for somebody else. danube may have been the OP, but he wasn't the only one benefiting from this post.

[LoRd_MuldeR]

Hey Guys wanted to know that what does deinterlacing means and how do u know dat the suggested deinterlacer by megui is correct or wrong and if its wrong how to know that which deinterlacer needs to be used.........

For the basic understanding on what interlaced video is and how to deal with it, have a look here:
http://www.100fps.com/

Furthermore this (German) site has some excellent info on the bizarre interlacing you may encounter in "real life" TV captures:
http://home.arcor.de/scharfis_brain/ExotischesInterlacing/

[Blue_MiSfit]

That's a great link also, Lord Mulder! I thought it was called 120fps, but couldn't find the sucker ;)

~MiSfit