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Adds VAAPI and VideoToolbox hardware encoders. Abstracts hardware related field accesses from the encoder and decoder to put them in HardwareAccel. They are freed in ~HardwareAccel. Limits bitrate when hardware encoding h264, else it can easily go up to a few MiB/s. Change-Id: I7d847d8ab3e4c9692341f038ce6d5dd76562e606
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