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acodec copy says use the same audio stream that's already in there. ffmpeg -i example.mp4 -f webm -c:v libvpx -b:v 1M -acodec libvorbis example.webm - 23 Mar 2017 Ffmpeg Command Tutorial With Examples For Video and Audio . We can extract audio stream from the video file and save audio as a ffmpeg -i video.mp4 -i audio.wav -c copy output.mkv If your audio stream is for example longer than the video stream, you have to cut it or 15 Dec 2009 It should also be mentioned that your source video file may have multiple audio channels or streams. For example, you may have both English 5 Jun 2017 FFmpeg is a great tool for quickly changing an AV file's format or quality, extracting audio, creating GIFs, and more. 05 Jun For example, to set the audio stream to be Vorbis, you would use the following command: ffmpeg -i 10 May 2017 These commands are just enough to getting started with FFMpeg. to do various audio and video transcoding, conversion operations with examples. tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(und): Audio: aac . To extract images from a video file, use the following command:14 Mar 2017 To extract the audio stream without re-encoding: ffmpeg -i input-video.avi . To encode mp3 audio ffmpeg.org shows the following example: ffmpeg -i input.wav ffmpeg -i vidui.mkv -c:v libx264 -c:a ac3 -crf 20 -map 0:0 -map 0:4 Here, 0:v:0 is the first video stream and 0:a:1 is the second audio stream. If we want to extract only audio streams, from the same input file, then we can do it like this: ffmpeg -i input.mkv -map 0:1 -map 0:2 -c 25 Nov 2016 ffmpeg -i input_video.mp4 -vn -acodec copy output_audio.aac Note that this video must have an audio stream to extract. the audio stream so it is much slower than just extracting the audio stream like in previous example.