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.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.

Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.

Ffmpeg crop avoptions explained