The VP4 codec is developed for an entirely different market. For it to be useful for videoconferencing, the cell phone has to be able to encode in real-time.
I'm sure they could achieve more compression by converting to grayscale, but if the bit rate is already low enough to send using cell phones, there is no need to reduce quality further.
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The VP4 codec is developed for an entirely different market. For it to be useful for videoconferencing, the cell phone has to be able to encode in real-time.
I'm sure they could achieve more compression by converting to grayscale, but if the bit rate is already low enough to send using cell phones, there is no need to reduce quality further.