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Assuming the two mono files are named "track1.wav" and "track2.wav", and the desired output name for the .mov file is "combined.mov", the following FFmpeg command can be used:

ffmpeg -i track1.wav -i track2.wav -filter_complex "[0:a][1:a]amerge=inputs=2[a]" -map "[a]" combined.mov

Explanation:

• "-i track1.wav -i track2.wav": specifies the input files to be combined
• "-filter_complex": applies a filtergraph for audio combining/filtering
• "[0:a][1:a]": specifies the audio streams from the two input files to be combined
• "amerge=inputs=2": merges the two audio streams into a single output stream
• "[a]": names the output audio stream as "a"
• "-map "[a]"": specifies that "a" is the audio stream to be included in the output file
• "combined.mov": specifies the output file name and format.