On 15/05/18 02:17, Dennis Lee Bieber wrote:
> On 14 May 2018 23:12:41 GMT, A. Dumas 
> declaimed the following:
>
>>
>> One jpeg will *easily* fit in system RAM. Also it’s in the filesystem.
>> Write to RAM at /run/shm/ and avoid all sd card writes. (Unless there’s
>> heavy swapping.)
>
>  A true JPEG would... But closer look at the provided code indicates it
> is not a JPEG, but a variant of h.264 VIDEO... That's likely to get a bit
> larger ... Depends upon resolution and frame rate (which aren't
> specified in the code -- the V2 Pi Camera module is 8MP as stills, and
> supports 1080p30 video. I've not found a good source for estimating file
> size -- Wikipedia seems to show around 20-50kbps for those resolutions...
> Which should still hold 10 seconds worth of video (but note that the
> original code does not seem to ever delete anything, it just creates new
> time-stamped 10-second files with 25-second skips as long as motion
> continues to be detected).
>
>  However, given the OP's statement of trying to put the files on a NAS
> device -- it should be possible to directly address the NAS storage and
> touch neither the SD card nor RAM; and that avoids the complication of
> having to delete the file(s) after transfer. I don't know how much overhead
> the NAS access would inflict upon the camera capture... 50kbps shouldn't
> have much of a hit on WiFi or 100Mbps Ethernet. If it does, using RAM for
> the capture, and using the 25 second gap to do a transfer/delete may be
> viable.
>
>  I'd probably also change the OP's delay logic by capturing the start
> time after motion is detected and then, after capture (~10 seconds) and
> post-processing (assuming RAM to NAS/delete RAM), using initial capture
> time + (say 30 seconds) - current time to determine the sleep time before
> checking for motion again. This would result in evenly spaced clips as long
> as there is motion... OP's code, if there were not post-capture processing,
> is resulting in ~35 second spacing...
>
>

The main problem I have is that ftp returns an invalid syntax.

If there some other way of uploading the pictures automatically , I
would certainly try it.

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