Nano & Cam bat running out ?

[Robin Probyn]

Hasnt happened to me.. but just wondered.. what happens with CF cards when the camera suddenly has no power.. during recording? you lose that clip/recording? totally.. ?

I have Delkin 64GB cards. if that makes any difference ,and HDX900 camera..

Thanks

[Dave Sperling]

My best guess would be that when the Nano stops gettign a video feed it closes the current file.
If the Nano is getting power from the camera, it cuts off at a lower voltage than most cameras, so it should have enough power to close and save the file.

[Dan Keaton]

Dear Robin,

If you are power both a camera and a nanoFlash with professional battery power, say an IDX or Anton Bauer Battery, the camera will most likely shut off before the nanoFlash.

The nanoFlash will continue to record as low as around 5.5 volts.

The camera will most likely shut off at a much higher voltage.

The nanoFlash will then detect the loss of the video feed and close the file gracefully.

And yes, there was a reason why we designed it this way!

And yes, Dave was 100% correct.


The nanoFlash voltage input is around 5.5 VDC to 19.5 VDC, and is protected from short duration over voltage conditions. It is also protected from short duration reverse voltage conditions.

[Robin Probyn]

Roger and copy that.. thanks gents

[Gints Klimanis]

Dan, what should we expect if the power plug is pulled out? I don't expect much.

[Dan Keaton]

Dear Gints,

If you are recording, and remove the power plug, the last segment of the Clip will be unusable.

But you do not lose the entire file, unless it is a short file.

[Robin Probyn]

Hi Dan

So nano records with the FAT system.. file max 4GB I believe.. at 50 Mbps Long GOP.. 1080p 25p .. if the power cable got ripped out.. what would be approx max file length destroyed..

Hope this makes sense !!

Thanks

[Dan Keaton]

Dear Robin,

The length of each one of segments (files) in a clip (overall recording), depends mainly on the bit-rate, but also depends on how many audio channels are being recorded.

May I suggest that you just set up your nanoFlash as you would normally, then run a test?

Then it is easy to the length (in minutes and secords) each file.

Then there is the File Size menu option which can be set from 20% to 100%.

In some cases, such as shooting news in a helicopter with a live feed back to a station, it is desirable to record short files.

This allows a short file of an important news event to be retransmitted via a microwave link back to the station.

[Andy Mangrum]

Hello Robin,

When Recording 1080p25 @ 50Mb at 100% File Size, With 2 Channels of Audio ,

the nanoFlash will create a new file about every ~10 Minutes, so in a Loss of power situation, that is the most amount of footage that could be lost.

Your Test should appear give you the same results.

Best Regards

[Robin Probyn]

Ok thanks.. I very rarely use AC power.. but just wondered.. any approx for the above but 4 channels sound.

Thanks again

Im shooting now with the nano for Through the Wormhole with Morgan Freeman.. in Japan..

[Dan Keaton]

Dear Robin,

Relative to the size required for video, the audio portion is relatively small.

I just love the "Through the Wormhole" with Morgan Freeman.

Thank you for letting us know that at least one episode is being shot with the nanoFlash.

[Robin Probyn]

Actually quite a few have been.. or parts of anyway..

The show has switched to Sony XDCAM 800,as the primary camera.. but they are fine with HDX900,or Varicam recording to nanoflash.. they have a few units of their own..