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I think doing your own research and making your own observations is perfectly legitimate. You can also get a bunch of friends over and have everyone listen to the same video/audio recordings and ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/21436 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I think doing your own research and making your own observations is perfectly legitimate. You can also get a bunch of friends over and have everyone listen to the same video/audio recordings and take notes, and then discuss afterwards. This will allow you to note similarities (e.g., does everyone think German is harsh, or just me?) and also hear how other people word their observations (one says "harsh," one says "lots of fricatives," one says "why does he always sound angry?") so you have a range of verbiage to draw on.