Pre-recording feature (raw_rec)
This looks simple enough to be included in main builds. To me, it looks like a pretty useful feature, so I think it's time to give it a little more testing (otherwise it may end up buried deep in the commit history).
http://www.magiclantern.fm/forum/index.php?topic=17069
Notes:
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@mk11174 requested a slightly different version - record a few seconds before AND after a trigger signal, then pause the recording. Maybe somebody has an idea how to implement it easily?
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there is a merge conflict with mlv_lite (easy to fix)
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if you want it in mlv_rec, you are welcome to port the implementation