![]() ![]() (Supported only by selected encoders, see their respective documentation sections.) frame_size integer ( encoding,audio )Įach submitted frame except the last must contain exactly frame_size samples per channel. For fixed-fps content, timebase should be 1 / frame_rate and timestamp increments should be identically 1. It is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented. Output even potentially corrupted frames. aicĪpply H263 advanced intra coding / mpeg4 ac prediction. Its primary use is for regression testing. This ensures that file and data checksums are reproducible and match between platforms. Only write platform-, build- and time-independent data. Place global headers in extradata instead of every keyframe. Error AVERROR_INPUT_CHANGED is returned when a frame is dropped. drop_changedĭon't output frames whose parameters differ from first decoded frame in stream. Input bitstream might be randomly truncated. ![]() Use internal 2pass ratecontrol in second pass mode. Use internal 2pass ratecontrol in first pass mode. Use four motion vector by macroblock (mpeg4). flags flags ( decoding/encoding,audio,video,subtitles ) Lowering tolerance too much has an adverse effect on quality. In 1-pass mode, bitrate tolerance specifies how far ratecontrol is willing to deviate from the target average bitrate value. The list of supported options follow: b integer ( encoding,audio,video ) Options may be set by specifying - option value in the FFmpeg tools, or by setting the value explicitly in the AVCodecContext options or using the libavutil/opt.h API for programmatic use. Also some options are meant only for decoding or encoding. Sometimes, a global option may only affect a specific kind of codec, and may be nonsensical or ignored by another, so you need to be aware of the meaning of the specified options. In addition each codec may support so-called private options, which are specific for a given codec. ![]() Libavcodec provides some generic global options, which can be set on all the encoders and decoders. This document describes the codecs (decoders and encoders) provided by the libavcodec library. ![]()
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