Ar: set the audio sample rate, the default is 0.g: set the video GOP size, key frame interval, the default is 12 frames a gop.
Ab: set the bit rate of the audio, the default is 128k. Use this parameter to set the video bitrate according to b:v and b:a to set the audio bitrate b: set the audio and video bit rate, which can be considered as the bit rate of audio and video added, the default is 200k. All the parameters under this option are the parameters that the codec can use: You can see AVCodecContext AVOptions by looking at the ffmpeg help full parameter. There are many kinds of multimedia encoding formats, but there are still many basic operating parameters that can be set together. The encoding and decoding operations are carried out through the libavcodec library. The codec part of FFmpeg is mainly through the library of libavcodec. Format_whitelist: Sets a whitelist of formats that can be parsed. Codec_whitelist: Sets a whitelist of codecs that can be parsed. If you want to reduce the delay in live broadcast, this can be set lower. The higher the value set here, the more accurate the parsing. Analysisuration: Specify the time spent on parsing media. Seek2any: support free seek, this seek can not be referenced by keyframe. Bitexact: does not write random or unstable data. Nobuffer: directly read or write, no buffer. Fastseek: quick seek, but not precise enough. Sortdts: Try to output in the order of dts. Discardcorrupt: discards corrupted frames. Nofillin: Do not fill in the value that can accurately calculate the missing. Flush_packets: Immediately flush the packets data into the file. Fflags: Sets the format of the format read or written in a variety of ways: -flush_packets, ignidx, genpts, nofillin, noparse, igndts, discardorrupt, sortdts, keepside, fastseek, lamt, nobuffer, bitexact, below These format read and write methods are explained in detail. Formatprobesiz: Set a format to get the size of the file to parse the file. Probesize: Get the size of the file content. Avioflags: The buffer setting of format, the default is 0, which means there is buffer:. 
All the parameters below this parameter are the parameters that can be used for the package conversion. Explain these common parameters in detail:įind the AVFormatContext parameter section by looking at the ffmpeg help full parameter. There are many formats of multimedia files, but there are still many demux and mux operating parameters are common. The mux and demux operations are performed through the libavformat library. The package conversion part of FFmpeg is mainly through the function of libavformat. Dynamic text with t (time second) variable.
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