ffmpeg examples in clear description

To combine 1.mp3 and 2.mp3 into one mp3 file with stereo 4 channels use this:

ffmpeg -i 1.mp3 -i 2.mp3 -filter_complex amerge -ac 2 -c:a libmp3lame -q:a 4 3.mp3

To create a video from an image and mp3 that is exactly 1 minute and 30 seconds. The output format can be either mp4 or flv,… Audio bit rate 192k and we use streaming H.264 format

ffmpeg -loop 1 -f image2 -i 1.jpg -i 1.mp3 -c:v libx264 -c:a aac -strict experimental -b:a 192k -t 00:01:30.000 -r 1 1.flv

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Another way to do the same from the image and from the mp3

ffmpeg -i 1.jpg -i 1.mp3 -c:v libx264 1.mp4

This will create third mp3 by concatenation of 1.mp3 and 2.mp3

ffmpeg -i "concat:1.mp3|2.mp3" -acodec copy 3.mp3

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