One of the first YouTube video I remember is Hyperactive by Lasse Gjertsen:
You know that effect in some videos where objects moving in the scene leave a trail of their old position?
A vocoder is basically a tool to turn any sound into something which can “speak”, some examples can be seen in this Collin's Lab episode about MIDI, or in this classic from the Kraftwerk (the vocoder effect starts at 1:06):
Whether you are planning to ask for a ransom, or joining the Daft Punk, or taking a time travel to the '70s: a vocoder is always handy.
If you need to generate test samples in different YUV formats you can use GStreamer's ffmpegcolorspace plugin like in the following snippet; for instance, in order to get an image in the NV12 raw format you can do:
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