When I replay a recording on GO4 the audio comes through but when I transfer the MP4 file to a Windows 10 PC there is no audio.  Video is fine.
Am I missing an audio CODEC?  Why does the audio track not play in Windows?

Audio is only recorded on the phone. The Spark records no audio. You would have to move the audio file form the phone to a pc and use a third party program to join audio with the flight video.

stuka75 Posted at 9-28 07:41
Audio is only recorded on the phone. The Spark records no audio. You would have to move the audio file form the phone to a pc and use a third party program to join audio with the flight video.

Thank you.  That explains it.

idanort@hushmai Posted at 9-28 10:57
Thank you.  That explains it.

Welcome. Actually, I've never done it as my in flight narrative would normally be quite boring, so I never record the audio on my phone. I do admit, soundless videos leave me felling deaf, even the noise of prop would be preferable. Enjoy

Hi. Thank you for reaching out to DJI Forum. With regards to this query, As stuka75 advised since the DJI Spark does not have any built in microphone, you will need to use a third party video editing software to add audio on the video. Thank you.