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You can solder it to the ground of the audio output (I imagine that being a IC). WIth short wire to it. Avoid it touching anything. Alternatively, fixing it to the IC heatsink also may work.
But, if insufficient to isolate the audio sector in this plane (above PCB), some shield below the PCB where the audio circuits are located will help, also.
In sum, any shield between the video out cables and circuits and the audio circuits.
Unless the audio are coming from a "jungle" IC having bad surrounding ground layout; then, is more difficult to solve.
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