decreasing volume of video without decreasing vol. of everything else?

[Bob Bob11]

How can I mute a video without muting anything/everything else I have playing on my galaxy s3?
Every single app I can play a video on has a volume control, but its NOT independent from the phone's master volume control.
If I decrease the video's volume via the app's control/setting, the whole phone is being turned down, not just the video.

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[Bob Bob11]

Why does everybody else's questions get answered but mine don't? What did I do wrong?

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