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FCP editing interframe codecs… How?
I’m very familiar with the difference between intraframe and interframe compression, their respective codecs and their respective implementation. I’m curious to know what FCP is doing under the hood to make interframe codec acquisition formats like HDV, XDCAM EX, etc. editable with single-frame accuracy. Anyone know how this is achieved?
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2 Replies
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Extrapolation from the last keyframe. Very computer intensive and almost useless while editing unless you have the hardware to support it. Easier to convert to a directly-editable format. Most of us transcode to something ProRes upon ingestion, often in realtime.
bogiesan
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I assumed as much about the compute-intensive aspect of the process. I’m just curious about the math of it, how the original frames are extrapolated from the GOP structure. I assume that interframe acquisition always uses a fixed length GOP structure, but what exactly is the structure of HDV and XDCAM EX in terms of I, P and B frames? Are all three types of frames even implemented? Thanks in advance.
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