using:b-frames
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using:b-frames [2010/04/15 18:27] j.m |
using:b-frames [2012/11/11 08:51] (current) |
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| 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. | ||
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| <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)
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