Is it possible to know if a video has been encoded either by 1pass or 2pass

[ss213]

Hi, I found some tvrips in the internet wich are in avi containers (which has HD), and I also found more tvrips (for the collection) which are in ts containers. The thing is that those avi files come from the original ts files, and I wanted to use MeGui to converte the ts files into avi files so I can have all the videos in the same format (I want them in avi).
The thing is that I know all the codecs and everithing from the avi file (I use gspot) but the thing is that all the videos have diferent sizes and diferent bitrates, so I believe I should use 1pass, but I don't now how many quantizers I should use.
So here goes my questions:
- Is there any way to know if a video has gone throw a 1pass or a 2pass or a CQ 1pass (does this one have any difference with the single 1pass)?
- Is there a way to know how many quantizers the video has passed?

Thank you!!

[edDV]

Why do you want to know?

What would you do differently if you knew?

[ss213]

because if I know how many quantizers I have to use I could convert the ts file into an avi file the same way all the other files where converted
I know it my sound stupid, just want to know if there was any way to know.

[edDV]

I'll let others comment but unless this is camcorder video, it has passed though several decodes - encodes before you got it.

[Cornucopia]

I've got a tan. Can you tell that I got it from the sun, or from a tanning bed? Unless you're an expert, you probably can't tell.

Same with the "results" of 1-pass, 2-pass, CQ. Unless you're an expert...
There are a few telltale signs, but unless you have good bitrate analysis tools, it would be pretty hard.

And again, why?
You shouldn't choose CBR, 1-passVBR, 2-passVBR, or CQ on some titles merely because that's what was used on some other ones. The point of those choices is to pick what's best for the material (also within the constraints of time, filesize, and bitrate), and they'll constantly change because the material changes.
If you want to create a "template" (say, 2passVBR at 8Mbps AVG, 15Mbps Peak) and apply that to all subsequent material, you can. Note, however, that some material you may have wasted too much bitrate and other material may not be high quality enough.
There is NO reason why you can't have multiple forms of bitrate within your various AVIs, especially if the codec and some other parameters (like resolution and framerate) is the same. Especially if they follow an accepted consumer standard.

And "Quantizers"?
You're either referring to the various coefficients in a quantizing matrix (there's usually at least 16, IIRC) or the compression/quantizing cycle (like Baldrick said). If it's the 1st, stick with the codec's default until you know MUCH MORE about how it affects picture quality. If it's the 2nd, hopefully you'll only be 2 generations down. (And the point is the keep the generations to a minimum for best quality)

Scott

[ss213]

thanks to all of you, you were helpful!