Ffmpeg: Combine/merge multiple mp4 videos - not working?

From the ffmpeg man page "Examples" section.

From the ffmpeg man page "Examples" section: · You can put many streams of the same type in the output: ffmpeg -i test1. Avi -i test2. Avi -vcodec copy -acodec copy \ -vcodec copy -acodec copy test12.

Avi -newvideo -newaudio In addition to the first video and audio streams, the resulting output file test12. Avi will contain the second video and the second audio stream found in the input streams list. The "-newvideo", "-newaudio" and "-newsubtitle" options have to be specified immediately after the name of the output file to which you want to add them.

If you meant you want to concatenate them, the FAQ has instructions. I'm not sure if this question/answer belongs on SuperUser.

You have to convert them into an MPEG format that can be easily concatenated. Below is a script I use and call "ffcat" for my GoPro videos. It essentially runs several "ffmpeg -i" commands which produce concatenate-able MPEG, which is piped to an ffmpeg command that then converts them to an H.264 mp4 file.

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