If a value of -1 is used, it will choose an automatic Set max number of B frames between non-B-frames. Set max difference between the quantizer scale (VBR). It is used as aĬonstant in the ratecontrol equation. Set video quantizer scale compression (VBR). It is set by some decoders to indicate constantĭelay integer qcomp float ( encoding,video ) May be 0 when the codec hasĬODEC_CAP_VARIABLE_FRAME_SIZE set, in that case the frame size is Their respective documentation sections.)Įach submitted frame except the last must contain exactlyįrame_size samples per channel. (Supported only by selected encoders, see Should be '1 / frame_rate' and timestamp increments should be It is the fundamental unit of time (in seconds) in terms of whichįrame timestamps are represented. Its primary use isĪic Apply H263 advanced intra coding / mpeg4 ac prediction.Ĭbp Deprecated, use mpegvideo private options instead.ĭeprecated, use mpegvideo private options instead.Įsa esa motion estimation (alias for full)ĭia dia motion estimation (alias for epzs) Reproducible and match between platforms. This ensures that file and data checksums are Only write platform-, build- and time-independent data. Place global headers in extradata instead of every keyframe. Error AVERROR_INPUT_CHANGED is returned when Use internal 2pass ratecontrol in second pass mode.ĭon't output frames whose parameters differ from first decodedįrame in stream. Use internal 2pass ratecontrol in first pass mode. Mv4 Use four motion vector by macroblock (mpeg4).

Lowering tolerance too much has an adverse effect onįlags flags ( decoding/encoding,audio,video,subtitles ) Tolerance specifies how far ratecontrol is willing to deviate from Using the libavutil/opt.h API for programmatic use. Options may be set by specifying - option value in the FFmpeg tools, orīy setting the value explicitly in the 'AVCodecContext' options or Sometimes, a global option may only affect a specific kind of codec,Īnd may be nonsensical or ignored by another, so you need to be aware In addition each codec may support so-Ĭalled private options, which are specific for a given codec. Libavcodec provides some generic global options, which can be set onĪll the encoders and decoders.

This document describes the codecs (decoders and encoders) provided by

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