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improve API docs, including caveats and bugs

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For #178
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Scott Lamb
2021-10-10 15:58:55 -07:00
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design/glossary.md
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# Moonfire NVR Glossary
*GOP:* Group of Pictures, as
[described](https://en.wikipedia.org/wiki/Group_of_pictures) on wikipedia.
Each GOP starts with an "IDR" or "key" frame which can be decoded by itself.
Commonly all other frames in the GOP are encoded in terms of the frames before,
so decoding frame 5 requires decoding frame 1, 2, 3, and 4. Many security
cameras produce a new IDR frame (thus start a new GOP) at a fixed interval of
1 or 2 seconds. Some cameras that use "smart encoding" or "H.264+" may produce
GOPs that vary in length, up to several seconds.
*media duration:* the total duration of the actual samples in a recording. These
durations are based on the camera's clock. Camera clocks can be quite
inaccurate, so this may not match the *wall duration*. See [time.md](time.md)