H.264 - Codec: B-Frame Settings

B-frames are a powerful video compression technique because they significantly reduce image data through prediction and motion compensation using neighboring frames. They offer high compression efficiency and improve video quality at low bitrates, making them particularly useful for video transmission and storage. However, processing complexity and higher latency are drawbacks that must be considered when applying B-frames.

Number of B-Frames

Number of B-frames between I and P

B-Frame mode

Motion vector prediction method for B-Frames.

Auto selects the best method per-frame

• None
• Spatial
• Temporal
• Auto

Adaptive B-Frames

Allows to use a dynamic number of consecutive B-Frames.

• Off
• Fast
• Optimal

B-Frame Pyramid

Allows use of B-Frames as references.

• None (do not allow B-frames to be used as references)
• Strict (allow one B-frame per minigop to be used as reference; enforces restrictions imposed by the Blu-ray standard)
• Normal (allow numerous B-frames per minigop to be used as references)

Weighted B-Prediction

When combined with multiple consecutive B-frames, this improves the prediction of fades.

Weighted B-Prediction improves the prediction accuracy of B-frames by providing a weighted prediction for the motion and color value of the B-frame based on the neighboring reference frames.

B-Frame bias

Modify the bias for use of Adaptive B-Frames.

Higher values increase use, lower values decrease