In this example the input file has audio as stream #0 and video as stream #1 (which is possible but unusual). The order of your -map options determines the order of the streams in the output. To ignore this, add a trailing '?' to the map. 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 See 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. stream_index (optional) will select a specific stream.Most of the examples below use stream specifiers. Stream specifiers include video, audio, subtitles, data, a ttachments. stream_type_specifier (optional) is a stream specifier which will limit the selection to a specific stream type.input_file_index refers to an input and by default will include all of its streams.map input_file_index:stream_type_specifier:stream_index Using the -map option disables the default stream selection behavior and allows you to manually choose streams. The default stream selection will choose streams based upon specific criteria.For example, if the input has 3 video streams it will only choose 1.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |