the first input file is 0, the second is 1, etc. To refer to input files in options, you must use their indices (0-based). Selecting which streams from which inputs will go into which output is either done automatically or with the -map option (see the Stream selection chapter). The allowed number and/or types of streams may be limited by the container format. Anything found on the command line which cannot be interpreted as an option is considered to be an output url.Įach input or output url can, in principle, contain any number of streams of different types (video/audio/subtitle/attachment/data). It can also convert between arbitrary sample rates and resize video on the fly with a high quality polyphase filter.įfmpeg reads from an arbitrary number of input “files” (which can be regular files, pipes, network streams, grabbing devices, etc.), specified by the -i option, and writes to an arbitrary number of output “files”, which are specified by a plain output url. Descriptionįfmpeg is a very fast video and audio converter that can also grab from a live audio/video source. For the best quality, use a CRF value (recommended range 15-35) and -b:video MUST be 0: ffmpeg -i input_video.mp4 -codec:video libvpx-vp9 -crf 30 -b:video 0 -codec:audio libopus -vbr on -threads number_of_threads output_video.webmįfmpeg. Remux MKV video to MP4 without re-encoding audio or video streams: ffmpeg -i input_video.mkv -codec copy output_video.mp4.AAC Audio 128kbit, h264 Video CRF 23: ffmpeg -i input_video.avi -codec:audio aac -b:audio 128k -codec:video libx264 -crf 23 output_video.mp4 Trim a video from a given start time mm:ss to an end time mm2:ss2 (omit the -to flag to trim till the end): ffmpeg -ss mm:ss -to mm2:ss2 -i video.mp4 -codec copy output.mp4.Quickly extract a single frame from a video at time mm:ss and save it as a 128x128 resolution image: ffmpeg -ss mm:ss -i video.mp4 -frames 1 -s 128x128 -f image2 image.png.Combine numbered images ( frame_1.jpg, frame_2.jpg, etc) into a video or GIF: ffmpeg -i frame_%d.jpg -f image2 video.mpg|video.gif.Save a video as GIF, scaling the height to 1000px and setting framerate to 15: ffmpeg -i video.mp4 -vf 'scale= -1: 1000' -r 15 output.gif.Extract the sound from a video and save it as MP3: ffmpeg -i video.mp4 -vn sound.mp3.
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