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What is best way, to join a Video-Only file, .m4v with m4a audio file, and output as mp4

Want to join them, without losing original quality, both file have same time length.

any good software.etc?

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ffmpeg -i audiofile.m4a -i videofile.m4v  -c copy  combined.mp4

Here -c copy tells to copy the stream instead of re-encoding. So the streams are as before. It is fastest and lossless.

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