This is the case, forĮxample, when the graph has more than one input and/or output, or when Another example is the 'setpts'įilter, which only sets timestamps and otherwise passes the framesĬomplex filtergraphs are those which cannot be described as simplyĪ linear processing chain applied to one stream. Note that some filters change frame properties but not frameĮxample above changes number of frames, but does not touch the frameĬontents. | output | | deinterlace | -> | scale | -> | output | | input | demuxer | encoded data | decoder The transcoding process in ffmpeg for each output can be described by the

The format option may be needed for raw input files. To force the frame rate of the input file (valid for raw formats only) toġ fps and the frame rate of the output file to 24 fps:įfmpeg -r 1 -i input.m2v -r 24 output.avi.To force the frame rate of the output file to 24 fps:.To set the video bitrate of the output file to 64 kbit/s:įfmpeg -i input.avi -b:v 64k -bufsize 64k output.avi.

All options apply ONLY to the next input or output file and Also do not mix options which belong toĭifferent files. Verbosity level), which should be specified first.ĭo not mix input and output files - first specify all inputįiles, then all output files. Exceptions from this rule are the global options (e.g. Each occurrence is then applied to the next Therefore, order is important, and you can have the same option on theĬommand line multiple times. Also see the Stream specifiers chapter.Īs a general rule, options are applied to the next specified file. To refer to input files in options, you must use their indices Selecting which streams from which inputs will go into which output TheĪllowed number and/or types of streams may be limited by the containerįormat. Streams of different types (video/audio/subtitle/attachment/data). Option is considered to be an output url.Įach input or output url can, in principle, contain any number of Anything found on the command line which cannot be interpreted as an Number of output 'files', which are specified by a plain output Grabbing devices, etc.), specified by the 'files' (which can be regular files, pipes, network streams, It can also convert between arbitrary sample ratesĪnd resize video on the fly with a high quality polyphase filter.įfmpeg reads from an arbitrary number of input ĭESCRIPTION ¶ ffmpeg is a very fast video and audio converter that can also grab from a

Ffmpeg extract frames with timestamp