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In google chrome developer tools:
Network -> Media
and as you are viewing the page you can see the audio files and video files are being played on the page.
Please add the same filter to filters of fiddler.
I'm not entirely sure what you're asking for-- can you explain specifically how you'd use this?
I don't see a "Media" option in the Network tab of Chrome's developer tools.
Fiddler offers a very extensive list of filtering options including the Filtering tab and elsewhere; perhaps you're asking that the Response Type and Size box offer a "Show only video/*" and "Show only audio/*" option?
FWIW, it's trivial to emulate those today. Click Rules > Customize Rules. Scroll to OnBeforeResponse and add something like:
if (!oSession.ResponseHeaders.ExistsAndContains("video/")) oSession["ui-hide"] = "Not a video";
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