![]() You can use the command in the third example to replace the default audio stream in a video file using FFmpeg. ![]() map 0:v:0 -map 1:a:0 -map 2:a:0 OUTPUT_FILE.mp4 Replace audio in video file using FFmpeg ffmpeg -i INPUT_FILE1.mp4 -i INPUT_FILE2.mp4 -i AUDIO2.aac You can clearly see how we select each input file (index 0,1,2) and decompose them with -map. On the other hand, it can contains multiple audio stream as well as subtitles, metadatas.īelow is an example where we take the video stream from INPUT_FILE1.mp4 and pair it with the audio streams from INPUT_FILE2.mp4 and AUDIO2.aac to make a new video file with multiple audio. Typically, a video file contains only one video stream. You can put literally unlimited number of input files and leverage -map to select separate streams from those files and include them in the output file. If you read the examples above, you will now have a glimpse of how -map works. Combine video with multiple audio using FFmpeg To re-encode the audio or video stream with a different codec, replace copy with the name of an audio encoder, such as aac or libvorbis. map 1:a:0, similarly, means select from the second input file (INPUT_FILE2.mp4, index number 1) the first audio stream (index number 0) to include in the output file. The first number (0) is the index of the first input file, the latter is the index number of the video stream. map 0:v:0 means that select the first input file (INPUT_FILE.mp4, index number 0), then select the first (0) video stream. A command line example would look like this : ffmpeg -i INPUT_FILE1.mp4 -i INPUT_FILE2.mp4 -c:v copy -c:a copy -map 0:v:0 -map 1:a:0 OUTPUT_FILE.mp4 Just like replacing audio stream with a separate audio file, you can leverage -map option to simultaneously extract audio stream in another video file and combine with the video stream to make another file. With the -map option, you are able to select any stream, no matter it’s video, audio, subtitle or metadata, to include in the output file. Replace audio in files with another audio stream using FFmpeg map 1:a:0, similarly, means select from the second file (index number 1) the first audio stream (index number 0) to include in the output file. map 0:v:0 means that select the first input file (INPUT_FILE.mp4), then select the first (0) video stream. ffmpeg -i INPUT_FILE.mp4 -i AUDIO.aac -c:v copy -c:a copy -map 0:v:0 -map 1:a:0 OUTPUT_FILE.mp4 The example will replace the audio in video.mp4 with audio.aac and output OUTPUT_FILE.mp4. Let’s suppose we have a video file with audio named video.mp4 and an audio file named audio.aac encoded with the AAC codec. The -map option can also be used to exclude specific streams with negative mapping. The -map option is used to choose which streams from the input/inputs to be included in the output/outputs. If your video file already contains one or more audio stream and you want to replace the default audio with another (external) audio file, you need to use FFmpeg’s -map option. In case you don’t want any audio conversion, just drop the aac part in the command and replace it with copy, so it would look like this ffmpeg -i INPUT_FILE.mp4 -i AUDIO.aac -c:v copy -c:a copy OUTPUT_FILE.mp4 Extract video from file and combine with another audio file using FFmpeg c:a aac means select all the audio stream from source files, then encode it with AAC encoder. c:v copy is a short form of -codec:v copy which means copy the video stream from the source files to the destination file. Similarly, -i AUDIO.wav tells FFmpeg to take AUDIO.wav as an input source. ![]() i INPUT_FILE.mp4 specify INPUT_FILE.mp4 as an input source If you want to combine them AND re-encode the audio to AAC format, you can use this command : ffmpeg -i INPUT_FILE.mp4 -i AUDIO.wav -c:v copy -c:a aac OUTPUT_FILE.mp4 Let’s suppose our video file name is INPUT_FILE.mp4 and the audio file name is AUDIO.wav. How to use ffmpeg to stream audio mp4#To ensure compatibility, we recommend using MP4 or MKV as the container. Please do note that the container (file extension) must accept the video and audio codec. If you have separate audio and video file, and the video file contains no audio, you can use this command to combine them into one video file. 6 Conclusion Combine separate video and audio using FFmpeg ![]()
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