Advantage of 3pass to 2pass

[Qudus]

Hi, NG

Can you tell me how much longer the 3pass encoding will last if the 2pass encoding needs 8 hours? Which advantages does it bring to the movie? Does it filter away the midgeswarms around humans?

greetz

Qudus

[adam]

Each pass should take roughly the same amount of time. If 2=8hrs then 3 should be right around 12hrs.

VBR encoding adjusts bitrate so that more or less is allocated according to the priority of the scene. The encoder uses a constantly updated algorithm to determine which scenes need what amount of bitrate. Multipass VBR works by analyzing the source at least once before encoding the final product. So the more passes it does the more info it gathers and theoretically, the better it can allocate bitrate.

Obviously beyond a certain # of passes the benefits of an additional pass are going to be null because there is only so much information that can be obtained, and this # may depend on your particular source.

a 3 pass vs a 2 pass vs cbr won't have any particular benefit in any particular area... if the encoder does its job then the quality should just plain be better with each additional pass up to a point, but even this depends on many factors.