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I want to merge an audio file (.wav or .au format) with a video file (.mp4 format).

Please suggest me a open-source utility to achieve this. I want to merge these file to new .mp4 video file. An ffmpeg command would be very welcome.

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There's a decent article here that might be helpful too... cfc.kizzx2.com/index.php/muxing-audio-and-video-with-ffmpeg –  Simon Feb 8 at 2:57

2 Answers 2

up vote 21 down vote accepted

See this example, taken from this blog entry but updated for newer syntax. It should be something to the effect of:

ffmpeg -i video.mp4 -i audio.wav \
-c:v copy -c:a aac -strict experimental output.mp4

You should transcode the audio in some way, since MP4s cannot have PCM audio streams. You can use a desired audio codec if you want. See the AAC Encoding Guide for more info.

If your input video already contains audio, and you want to replace it:

ffmpeg -i video.mp4 -i audio.wav \
-c:v copy -c:a aac -strict experimental \
-map 0:v:0 -map 1:a:0 output.mp4

The map option makes ffmpeg only use the first video stream from the first input and the first audio stream from the second input for the output file.

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I tried it but ffmpeg is freezing while merging –  Sandy May 1 '11 at 11:41
    
i don't think mp4 containers can have wav audio streams. Try ffmpeg -i audio.wav -i video.mp4 -acodec copy -vcodec copy -f mkv output.mkv –  Luke Mar 12 '13 at 23:29
    
I am using this and it is replacing the origional audio from the input audio. What if I want to merge input audio with the audio of input video? –  Iqbal Malik Jan 31 at 7:00
    
Very sweet command lines... –  Chandra Nakka Sep 3 at 4:37

Try using mencoder (Yes it is ffmpeg based, but you never know). I use the -audiofile argument. I generally use ffmpeg, though, so take this advice with a pinch of salt.

And, if you use Windows, Mediacoder (not open source anymore sadly) works... its basically a frontend for a lot of gnu encoders and a few non-free ones.

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