combine mp4 ffmpeg code example

Example 1: ffmpeg add two videos together

$ cat mylist.txt
file '/path/to/file1'
file '/path/to/file2'
file '/path/to/file3'
    
$ ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4

Example 2: merge gif with mp4 using ffmpeg

ffmpeg -i input.mp4 -i eq.gif -filter_complex "[1]format=rgba,colorchannelmixer=aa=0.5[front];[0][front]overlay=x=(W-w)/2:y=H-h,format=yuv420p" output.mp4

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