ffmpeg -i input.mkv -c copy -map 0 output.mp4 (Note: This may keep both audio tracks; specify map if needed.)

I notice you're asking about a guide related to a specific movie file: .

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Passengers.2016.720p.dual.audio.hin-eng.mkv File

ffmpeg -i input.mkv -c copy -map 0 output.mp4 (Note: This may keep both audio tracks; specify map if needed.)

I notice you're asking about a guide related to a specific movie file: . Passengers.2016.720p.Dual.Audio.Hin-Eng.mkv