file="/Users/sw/Dropbox/Events/2017/Eclipse/IMG_0126-smaller.MOV";
framecount=Import[file,"FrameCount"]
19791
Import[file,"FrameRate"]
29.9848
ListPlot[Table[ImageMeasurements[Import[file,{"ImageList",n}],"MeanIntensity"],{n,10}]]
0
2
4
6
8
10
0.5720
0.5725
0.5730
ListPlot[Table[ImageMeasurements[Import[file,{"ImageList",n}],"MeanIntensity"],{n,10}]]
Import[file,{"ImageList",n}]
Import[file,{"ImageList",8006}]
Table[Import[file,{"ImageList",8000+n}],{n,0,10}]

,
,
,
,
,
,
,
,
,
,


Calculation

starttime=FileDate["/Users/sw/Dropbox/Events/2017/Eclipse/IMG_0126.MOV"]
Mon 21 Aug 2017 11:30:33GMT-4.
DateObject[Today,TimeObject[{11,35,2}]]
Mon 21 Aug 2017 11:35:02GMT-4.
%-starttime
4.48333
min
Import[file,"FrameRate"]
29.9848
Quantity[%,1/"Seconds"]
29.9848
per second
%*%89
8065.92
Import[file,{"ImageList",8065}]
Import[file,{"ImageList",8000}]
Import[file,{"ImageList",7900}]
Import[file,{"ImageList",7950}]

End of Eclipse

Whole Eclipse