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. If your input video already contains audio, and you want to replace it, you need to tell ffmpeg which audio stream to take: ffmpeg -i video.mp4 -i audio.wav -c:v copy -c:a aac -map 0:v:0 -map 1:a:0 output.mp4 mp4 -vf scale 640: -1 04 d.png For example, the command above sets the width to 640 pixels. ffmpeg -i input.mp4 output.avi Discover more News January 17th, 2022, FFmpeg 5.0 'Lorentz' FFmpeg 5. ![]() Download Converting video and audio has never been so easy. If your output container can handle (almost) any codec – like MKV – then you can simply copy both audio and video streams: ffmpeg -i video.mp4 -i audio.wav -c copy output.mkv The scale filter is a very powerful feature of FFmpeg which let you specify either the width or the height of the image and set the other component to -1 to keep the same ratio. FFmpeg A complete, cross-platform solution to record, convert and stream audio and video. If your audio or video stream is longer, you can add the -shortest option so that ffmpeg will stop encoding once one file ends. See the FFmpeg Wiki: AAC Encoding Guide for more info. You can use any other desired audio codec if you want. ![]() The above command transcodes the audio, since MP4s cannot carry PCM audio streams. ffmpeg -i input.mp3 -ss S -to E -c copy output1.mp3 -ss S -to E -c copy output2. Here, we assume that the video file does not contain any audio stream yet, and that you want to have the same output format (here, MP4) as the input format. ![]() It should be something to the effect of: ffmpeg -i video.mp4 -i audio.wav -c:v copy -c:a aac output.mp4 See this example, taken from this blog entry but updated for newer syntax. Merging video and audio, with audio re-encoding The streaming works fine but after few minutes ffmpeg exit (see the ffmpeg log file) printing: 'Exiting normally, received signal 15.
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