Frame Control
Various frame types are used under the MPEG-4 standard, which can be seen as fixed points, to which motion changes are referenced.
- I-frame - This is the fundamental and most complete frame type, which stores all data and from which motion changes are described.
- P-Frame - Stores differences between I-Frames or other P-frames.
- B-frame - This is a bidirectional frame, which stores the differences between past or future frames. The most compressible frame type, holding least information, typically used in fast action sequences. Not enabled in all profiles.
For bidirectional (B-frame) encoding the DivX codec offers two options:
- Adaptive Single Consecutive - This typically offers the best overall compression, since it limits the number of B-Frames that can be inserted close together in fast moving sequences. Since the human eye perceives details more accurately in slow moving or stationary scenes, the bits are more effectively allocated to those scenes.
- Adaptive Multiple Consecutive - Will give smoother motion, but at the expense of file size, since no limit on consecutive frames is imposed.
Read more about this topic: Dr. Div X
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