Examples of using B-frames in English and their translations into German
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Colloquial
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Official
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Ecclesiastic
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Medicine
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Financial
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Ecclesiastic
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Political
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Computer
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Programming
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Official/political
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Political
Do not use QP from B-frames default.
B-frames: QuickTime 7 supports a maximum of 1 B-frame, i. e.
Use weighted prediction in B-frames.
Use QP from B-frames too may cause flicker.
Quantizer factor between P- and B-frames default: 1.3.
MPEG4CCTV only generates B-frames as difference pictures, uni-directionally focussed on the previous I-frame.
Max. 25fps or 30fps when b-frames are used.
This setting allows you to specify what priority to place on the use of B-frames.
Like 0, but also use B-frames' QP may cause flicker.
The encoder rarely chooses to use more than 3 or 4 B-frames;
Automatically decides when to use B-frames and how many, up to the maximum specified above default: on.
If this option is disabled,then the maximum number of B-frames is used.
Using weighted prediction in B-frames makes it possible to turn at least some of these into much smaller B-frames.
A higher b_bias produces more B-frames default: 0.
Nonref: Skip frames that are not referenced(i.e. not used for decoding otherframes, the error cannot"build up"). bidir: Skip B-Frames.
Do not forget that B-frames usually have a higher quantizer, and therefore aggressive production of B-frames may cause worse visual quality.
Each GOP contains three types of frames: I-Frames, P-Frames(pictures) and B-Frames.
This setting allows vector candidates for B-frames to be used for the encoding chosen using a rate distortion optimized operator, which is what is done for P-frames by the vhq option.
Determines the type of motion prediction used for direct macroblocks in B-frames.
It is interesting to note that using B-frames usually speeds up the second pass somewhat, and may also speed up a single pass encode if adaptive B-frame decision is turned off.
Adjusts how sensitively vb_strategy=1 detects motion and avoids using B-frames default: 40.
HINT: To do constant quantizer encoding with different quantizers for I/P- and B-frames you can use: lmin=: lmax=: vb_qfactor.
However, if you need to be compatible with standalone players that only support old DivX profiles(which only supports up to 1 consecutive B-frame),this would be your only way to increase compressibility through using B-frames.
If you are bitrate-starved, you should increase both max_bframes and bf_threshold, while you may increase max_bframes and reduce bf_threshold so thatthe encoder may use more B-frames in places that only really need them.