motion search precision

[svdf]

what is motion search precision? does it have much to do with the quality of the movie?

[mikk]

this is the setting that affects quality the most. if you actually tried it yourself you would know.

maybe you would also know if you read the 'tmpgenc explained' tutorial in one of the sections on the left.

if you're using tmpgenc you could try reading the tooltips within the program too.

there are a multitude of ways to find out, but please make some kind of attempt to solve problems on your own before posting here.

[svdf]

well you know... i've watched the tooltips, i searched the faq's read the tutorials, bot in none of them is explained well what it really does. i also tried it, but i couldnt see any big difference, so therefor i wanted to know what it actually does...

i mean, the resolution affects the quality, the bitrate too, but i what way the motion search precision?

so i hope you could geveme a better answer now, because i'm not as lazy as you think... (i'm only not so good in english so my questions are always a bit short and primitive... )

[Mark W.]

Hey Mikk

LAY OFF!!!!

Last time I checked, this was a Forum. A forum is a place of discusion. If you have enough time to flick someone that much crap, why don't you use it try and help. Or were you?

Mark

[Whoosh25]

I believe they are the encoding rates of frames per second (fps):

9.7 fps (very fast)
8.5 fps (fast)
6.9 fps (normal)
5.2 fps (slow)
3.5 fps (very slow).

I usually use High Quality 5.2 fps (slow) but a friend says he can see no difference so he sets his to normal.

[mikk]

that was the ol' righteous saviour reply from Mark W.

Thank you Mark W...

I have helped thousands of people through my posts here and my vcd stills tutorial (in the AUTHOR section on the <-- right), but i get sick of people that are too lazy to find answers for themselves. i could count the number of times i've asked for help on this forum on one hand, and usually the question i ask isn't answered fully because it really is a hard question. i don't mind that because i then know i asked a good question.

svdf understands this and explained this in his 2nd post.

on to motion search precision...
1. short version
low motion search precision: low quality, blocky, fast to encode
high motion search precision: high quality, less blockiness, slow to encode

2. long version
motion search precision adjusts how much the encoder searches for motion between different frames. this means it looks at a block in a frame and then looks at the next frame for the same (or similar, depending on other settings) block somewhere else in the picture. if a similarity is found, information on the direction and how much the mpeg block moved between the 2 frames is put into the mpeg stream, so that the block is used in a different place in frame 2. by doing this the same thing isn't encoded twice. this means that less bits are used when things are repeated. then bits can go to other things like encoding the block better in the 1st frame.

setting the motion search precision to the highest quality (slowest) setting will make the encoder search really hard for repetition between frames. this makes the picture a lot better when things are moving.

but if you encode a video with only small amounts of movement, you can sometimes get away with lower settings to save time. but even in low motion pictures, different parts of the image might be the same, so i always use the highest setting to give the best picture.

professional dvd authoring hardware uses extremely sophisticated methods to search for motion, and that's what makes them so expensive, but so high quality.

[mikk]

whoosh25, did u get that from http://tangentsoft.net/video/mpeg/reviews/tmpgenc.html ?

those fps figures vary hugely dpending on your cpu. that site measured the fps with a 1.2GHz Athlon.

u will see the quality difference when things are moving.

remember that professional hardware decoders that cost hundreds of thousands of dollars (e.g. ones used by cts to encode dvds) encode considerably better than even the highest setting in tmpgenc.

[svdf]

well i don't think i will buy such an encoder but thanks for the help.. and i think i wil use the normal setting... (becaus my computer is not very fast... 800 Mhz) but will this also make difference in the size of the file?

[Whoosh25]

WoW...that's one of the best explanation of motion search precision I've seen!...thanks mikk.

Yes I got those fps rates from that site in my feeble attempts to answer svdf's original post

Hey God! ..aka the moderators ...how about putting what mikk wrote on somewhere on the TMPGEnc Explained site before it's buried in the forums?
http://www.vcdhelp.com/tmpgencexplained.htm

Anyways I'm going to print this out...

Cheers