![]() ![]() If -map 0:a is used instead, and there are no audio streams, then ffmpeg will fail with Stream map '0:a' matches no streams. To map the video and audio streams and ignore the audio mapping if no audio streams exist:įfmpeg -i input.webm -map 0:v -map 0:a? output.mkv Output audio stream index #3 (the 4th audio stream) to audio_3.wav:įfmpeg -i input.mkv -map 0:v video.mp4 -map 0:a:1 audio_1.mp3 -map 0:a:3 audio_3.wavĪdding a trailing question mark ( ?) to -map will ignore the mapping if the stream does not exist. Output audio stream index #1 (the 2nd audio stream) to audio_1.mp3. You can use almost any arbitrary names to label the filter outputs. In this example the filtered video is named and the filtered audio is named :įfmpeg -i input.mp4 -i logo.png -i audio.mp3 -filter_complex "scale=1280:-1 overlay volume=-3dB" -map "" -map "" output.mp4 HOW TO USE FFMPEG TO STREAM MPTS VIA TCP ISOSee List of ISO 639-1 codes for the 3 letter language names. Include all video and all streams with Spanish language metadata:įfmpeg -i input.mkv -map 0:v -map 0:m:language:spa output.mp4 Video and audio from different files ffmpeg -i video.mp4 -i audio.m4a -map 0:v -map 1:a output.mp4įfmpeg -i input.mp4 -map 0 -map -0:a output.mp4 Video streams only ffmpeg -i input.mp4 -map 0:v output.mp4Īudio streams only ffmpeg -i input.mp4 -map 0:a output.mp4įfmpeg -i input.mkv -map 0:v:4 output.mp4 Using stream copy to remux (no encoding):įfmpeg -i input.avi -map 0 -c copy output.mkv This is useful if you want to mux only and avoid encoding.įfmpeg -i input0.mkv -i input1.mp4 -i input2.wav -map 0 -map 1 -map 2 output.mkv Tip: You can add -c copy to many of these examples to enable stream copy mode. If stream_type_specifier is used then the stream_index only refers to the selected stream type and ignores all other stream types.
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