User Tools

Site Tools


using:b-frames

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
using:b-frames [2010/04/15 18:27]
j.m
using:b-frames [2012/11/11 08:51] (current)
Line 5: Line 5:
 Video frames can be divided among 3 types: Video frames can be divided among 3 types:
  
-  - [[I-frames|I-Frame]]:​ Intra frame, also called keyframe. They have no reference frame and can be decoded on their own. They can be thought of as a JPEG image. +  - **[[I-frames|I-Frame]]:​** Intra frame, also called keyframe. They have no reference frame and can be decoded on their own. They can be thought of as a JPEG image. 
-  - P-Frame: Predicted frame. They are deduced from the previous frame (I or P) and cannot be built if the decoder has not decoded the previous frames. +  - **P-Frame:** Predicted frame. They are deduced from the previous frame (I or P) and cannot be built if the decoder has not decoded the previous frames. 
-  - B-Frame: They are decoded from the previous and next I-P frames. ​+  - **B-Frame:** They are decoded from the previous and next I-P frames. ​
  
 B-frames are interesting for two facts. First, they have a slightly better prediction. And second and more important, they do not impact the quality of following frames, so they can be encoded with lower quality without degrading the whole sequence. B-frames are interesting for two facts. First, they have a slightly better prediction. And second and more important, they do not impact the quality of following frames, so they can be encoded with lower quality without degrading the whole sequence.
Line 23: Line 23:
 <​code>​I-0 P-3 B-1 B-2</​code>​ <​code>​I-0 P-3 B-1 B-2</​code>​
  
-To keep thing simple, the file is encoded with DTS order.+To keep things ​simple, the file is encoded with DTS order.
  
 ===== The problem ===== ===== The problem =====
using/b-frames.1271348873.txt.gz · Last modified: 2012/11/11 08:51 (external edit)