[Elphel-support] EXIF data from .mov file + other questions

[Bader AlKahtani]

Also, I can see that Quicktime pro has an Export to Image Sequence feature
but it wont capture the GPS information for each JPEG. I also found a few
other splitters online but all disregard any EXIF data. Would love to get
your thoughts.

On Wed, Mar 2, 2011 at 1:22 PM, Bader AlKahtani <bader at kahtani.com> wrote:

> Thanks a lot for this.
>
> - I was wondering with regards to splitting the JPEGs with the EXIF data
> (the geotag information), is there by any chance another solution that is
> more friendly for someone with little technical expertise? Is there a way of
> running Movie2dng on windows? I'm a very fast learner but I really could not
> understand how to get the process going.
>
> - I tried splitting the .mov using quicktime pro, it did the process fine
> but without the EXIF information - is there anyway of doing the same but
> with the EXIF information included?
>
> Any input would be highly appreciated.
>
> Best Regards,
>
> Bader
>
> On Wed, Mar 2, 2011 at 1:56 AM, Oleg K Dzhimiev <oleg at elphel.com> wrote:
>
>> Dear Bader,
>>
>>
>>> 1) Splitting a video file to individual jpegs and linking Geo information
>>> to each jpeg. What is the best practice for doing so? I read that recording
>>> a .mov then extracting the exif data is a solution but how would that be
>>> done - I would really love a step-by-step (I read that there is a php that
>>> does this, can you forward that to me?).
>>>
>>
>> If the GPS receiver is connected to the camera - each frame will be
>> geotagged by default. So, if you save a .mov of .jpegs just split it.
>>
>> As an alternative to php there's a program movie2dng (
>> http://wiki.elphel.com/index.php?title=Movie2dng) but it splits .movs and
>> sets the extension to .jp4. I wrote more about it in the end of the letter,
>> from the command line it'll look like:
>>
>>> movie2dng file.mov
>>>
>>
>> I also have a php version - I'll polish it a bit and upload somewhere.
>>
>> 3) I read in one of the threads about not needing to record a KML file in
>>> order to geotag video frames and it also because it might make the processor
>>> to go over capacity. What would I need to do to disable the KML file? Do I
>>> uncheck geotagging in the Disk writing tool? Or do I uncheck 'Save Exif
>>> Data' in the advanced tab?
>>>
>>
>> With GPS attached to the camera each frame's exif header is geotagged.
>> And, by default, the KML file is not generated.
>>
>>
>>> 4) How do I upgrade the SD Card? Where is the slot? Do I need to actually
>>> take apart the case?
>>>
>> http://wiki.elphel.com/index.php?title=File:10353-10369-assy_blowup.jpeg
>>
>> You'll need to unscrew the top cover only. If there's a compass inside
>> it'll be installed instead of the top CF card - please, careful with the
>> compass cable.
>>
>> Some of the CF cards will not work because of not supporting DMA.
>> We use *SanDisk Extreme III* series - works fine.
>>
>>
>> More about movie2dng and jp4:
>>
>> Instead of jpeg you could try jp4 format.  It's a kind of a raw format -
>> that should give better quality -
>> http://wiki.elphel.com/index.php?title=JP4
>> To split it use: http://wiki.elphel.com/index.php?title=Movie2dng
>>
>> PHP code (well, not really PHP) to convert jp4->dng->jpeg:
>>
>> exec("movie2dng --dng image.jp4");
>>> exec("dcraw -q 1 -f -c image.dng | cjpeg -quality 100 > image.jpeg");
>>>
>>
>> "-q 1 -f" - are for VNG 4 color demosaicing. Additional programs are dcraw
>> & cjpeg. If you use (K)Ubuntu:
>>
>>> sudo apt-get install dcraw
>>> sudo apt-get install libjpeg-progs
>>>
>>
>> Best regards,
>> Oleg
>>
>>
>
>
> --
>
> ________________________________*
> Bader K. AlKahtani*
>
> E-mail: Bader at Kahtani.com <bader at kahtani.com>
>
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-- 

________________________________*
Bader K. AlKahtani*

E-mail: Bader at Kahtani.com <bader at kahtani.com>

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