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Jul 13, 2017, 11:27 PM
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The return of 'pro video


Compared to what Bezos was offering for $400, B&H threw in an extra battery & viewfinder for $300. Either they must be having a hard time getting rid of the pros or Bezos is milking an extraordinarily inefficient market fueled by The Janet. People must prefer what the Chinese cams offer, despite the limitations.


This is still the action cam that Casey Neistat, Ginger Runner, Billy Yang & all the greats used during the peak of the goo tubes. After the Goog slashed profit sharing, the quality of the content dropped like a lead weight & the golden age ended too soon for the Hero 5 & the DJI gimbals.



Well, the free charger is only a battery charger in the academic sense. Similar to the Wasabe charger, you're better off using the camera.


The viewfinder is only a viewfinder in the academic sense. It's a touch screen. It stays on for a few seconds, but not long enough to frame a shot. Resolution & screen size aren't high enough to frame anything accurately or judge exposure. It bobs up & down like interlaced video. It's most useful for configuration.


It records 4k 24fps off a 2A USB power supply with no viewfinder. It requires a battery to record with the viewfinder. 4k 24fps goes down at 60 megabits.


The lion kingdom was immediately confronted by the mysterious 4k superview mode. The problem is the Ambarella only has enough clockcycles to encode 3840x2160 pixels, but the full sensor has a lot more pixels in a 4:3 chip. They seem to be spherically mapping the 4000x3000 sensor onto 3840x2160 pixels, giving little distortion in the center but extreme distortion on the edges. There's a little extra information in the sides & a lot more information in the vertical edges. This can be reversed in software to give 3840x2880. Then this can be cropped into a 16:9 3840x2160, but the intermediate spherical mapping has reduced the vertical information to the equivalent of 1620 pixels, with most of the information lost from the vertical edges & no information lost from the sides.


The highest official 4:3 mode is 2704x2028 or 5.5 megapixels. This gives many options for cropping into 2704x1520 & scaling down to get super sharp detail. The 4k modes have 8.2 megapixels so there's still some marginal gain after cropping to 16:9. Since the most information is lost from the vertical edges, anything outside the center is going to be hugely degraded, so there's little point in using the 4k superview for cropping.


They could have simply used nonsquare pixels like generations as recent as generation X experienced in DVD video. This would have been a game changer, but the current generation has no memory of non square pixels & no knowledge of how to fudge the video between extracting it from the camera & uploading it to the goog. They would have given negative reviews.


The experience of actually paying for a camera was a huge motivation to always keep it in the armor case.
Last edited by Jack Crossfire; Jul 14, 2017 at 02:32 AM.
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