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An honor code certificate of achievement certifies that you have successfully completed a course, but does not verify your identity (ref
Merging video and audio, with audio re-encoding
See this example, taken from this blog entry
but updated for newer syntax. It should be something to the effect of:
ffmpeg -i video.mp4 -i audio.wav \
-c:v copy -c:a aac -strict experimental output.mp4
Here, we assume that the video file does not contain any audio stream yet, and that you want to have the same output format (here, MP4) as the input format.
The above command transcodes the audio, since MP4s cannot carry PCM audio streams. You can use any other desired audio codec if you want. See the AAC Encoding Guide
for more info.