2-pass VBR vs CBR

[Syndrome]

Hay all,

I asked a question a few days ago about the pixelation effect that occurs in high motion scenes using th CBR encoding technique. A few people have told me to use this 2-pass VBR.

I want to hear your opinions on this, and/or any other means of eliminating this pixelation effect.

I have used 2-pass VBR and it seems to work quite well, although it takes twice as long to encode a movie (roughly 5-6 minutes for every 1 min of movie). Which i dont mind at all.

Syndrome

[Faceman101]

Do a search. You're going to start another 10 page thread that will come to the same conclusion of the other "vs" threads.

CBR and 2-pass VBR have their own benefits. It depends on the situation.

[PyRoMaNiA]

A well adjusted CQ will be even better than 2-pass VBR.

[puertorican138]

I hope this topic doesn't start another VBR vs. CBR war...

[Syndrome]

lol i just wanted to know that advantages and disadvantages of both, since i couldnt find it on this site..

i didnt mean to start a war!!

[puertorican138]

Constant Bit Rate(CBR): This means that your bitrate will have a fixed setting, and during high motion scenes, due to being fixed, block noise may occur. It is encoded by TMPGEnc reading a few frames and then encoding them.

2-pass Variable Bitrate (VBR): This means that your bitrate has an minimum, maximum, and average bitrate. On this one you can set the average to a fixed setting and have it either raise to the maximum you set during high motion scenes or fall to the minimum you set when there is little motion. This setting is good for figuring out the size of the file that is being outputted and to have it reach higher bitrates yet still maintaining a lower file size. under the settings of this setting is where
you would put in everything you need to. There is also a setting, "Enable padding When falling below the minimum bitrate", if checked. forces the rate of the movie not to fall under the minimum bitrate you entered. Also this setting will go over the whole movie first then at 50% it will start to encode it, and this takes time...Allot of time! Why would anyone do this you ask. Well I do this because I know approx. what the file size will be and I feel that I will get the most out of my movie.

Hope That Helps!!! :P