FFmpeg - Scale and Letterbox

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ffmpeg -i <input.file> -c:v libx264 -filter:v "scale=(iw*sar)*min(640/(iw*sar)\,480/ih):ih*min(640/(iw*sar)\,480/ih), pad=640:480:(640-iw*min(640/iw\,480/ih))/2:(480-ih*min(640/iw\,480/ih))/2" -f mp4 <output.file>

Reference: FFMPEG - Encoding Optimal Videos for Streaming#Change_Resolution_and_add_Letterbox
Reference: [stackoverflow: Proper way to letterbox with ffmpeg]

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