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Injected Video Subtitles for the Mavic Mini
450 6 1-4 22:30
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BobWinNV
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Flight distance : 195558 ft
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Turning on the subtitle option on the Mavic Mini will write data every second which is encoded into the video as subtitles.

The data can be extracted into an SRT file and will look like this:

60
00:00:59,000 --> 00:01:00,000
F/2.8, SS 202.82, ISO 110, EV -0.7, GPS (-115.1745, 36.3032, 16), D 9.47m, H 41.50m, H.S n/a, V.S n/a

61
00:01:00,000 --> 00:01:01,000
F/2.8, SS 60.30, ISO 200, EV -0.3, GPS (-115.1745, 36.3032, 15), D 9.43m, H 41.60m, H.S n/a, V.S n/a


These two examples were picked because they are consecutive (seconds 60 and 61) but different.  I understand most of the data but have not figured out the SS field.
SS sure sounds like Shutter Speed but I have not been able to figure out the relationship of the numbers shown above ( SS 202.82 and SS 60.30) to shutter speeds expressed as fractions.  At first I guessed that they might be expresed in miliseconds but they did not convert to any common shutter speed fraction.

Does anyone here know what the SS field is and if it is in fact Shutter Speed how is it converted to a more meaningful fraction representation?

Thanks.
1-4 22:30
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djiuser_aAbZcEJUqGw0
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Wondering this as well!
1-11 19:50
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TDZHDTV
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Flight distance : 1469495 ft
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Shutter Speed maybe?
1-12 00:00
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Sigmo
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Now I'm curious, too.  Did the exposure change two stops between seconds 60 and 61?

With this being an electronic "shutter", the shutter speeds don't necessarily need to be constrained to the usual shutter speed progression we're used to from "normal" cameras.  So odd values might be used.

These might be microseconds.  The first one, 1/4930th of a second, and the second one 1/16584th of a second.  I know some of these digital video cameras like in the security cameras go upwards of 1/100,000th of a second for the high end of the shutter speed.  Without being able to stop down a mechanical aperture, they have to be able to use very fast shutter speeds to deal with bright daylight scenes.

1-12 00:14
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BobWinNV
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Flight distance : 195558 ft
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Sigmo Posted at 1-12 00:14
Now I'm curious, too.  Did the exposure change two stops between seconds 60 and 61?

With this being an electronic "shutter", the shutter speeds don't necessarily need to be constrained to the usual shutter speed progression we're used to from "normal" cameras.  So odd values might be used.

I changed the EV from -0.7 to -0.3 between 60 and 61 and ISO went from 110 to 200.
1-12 12:14
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BobWinNV
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TDZHDTV Posted at 1-12 00:00
Shutter Speed maybe?

That is what I had initially thought.
1-12 20:23
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Sigmo
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Can't delete a post.
1-12 21:07
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