Why does YouTube Export with Filters greatly increase file size

[kagsundaram]

@codeowl

I then added the filters:

• Old Film - Scratches
• Old Film - Dust
• Old Film - Grain
• Saturation

Wow!
That is a LOT of video information added uniquely to each frame of your video.
Video size is a function of many things, one of which is the amount of difference between successive frames. These filters have added significant differences between each sequential frame. In order to maintain the Quality specified, the codec software must increase the percentage of I-Frames, correspondingly reducing the number of small, efficient P-Frames and B-Frames

@Elusien has explained this in another thread…

@Elusien

A GOP (Group Of Pictuires) always starts with an I-frame (Intra frame).
An I-frame contains all the information needed to produce the picture for that frame, it does not depend on the contents of any other frame. If the GOP consists of only I-frames it would emulate an old cinematographic spool of tape, where e.g. damage to one frame would not affect any other frame.

The GOP can also contain zero or more B-frames (Bi-directional frame).
B-frames consist of information that describes the changes in the picture between this frame and the previous one. So damage or corruption of an I-frame or B-frame would affect the validity of subsequent consecutive B-frames.

The GOP can also contain zero or more P-frames (Predictive frames).
P-frames consists of information that describes the changes in the picture beween this frame and the previous I-frame and also the following I-frame. In this way any discrepancies or corruption within previous B-frames are eliminated from this P-frame onwards.

…which it would do well to read in its entirety.