[Elphel-support] Elphel performance, Framerate / JP4

[Andrey Filippov]

On Sun, May 23, 2010 at 1:54 PM, Andreas Bean <office at beanbox.com> wrote:

> Hello Andrey,
>
> Thank you for the detailed explanation. So it seems that the limiting
> factor is the hdd.
> How can I measure the write speed? hdparm has no option...
>
> Andreas,

I'm not that Linux guru to tell you the exact answer, I used "dd" command
(looking into ttp://linux.die.net/man/1/dd or similar page). Just remember
thet "dd"  is a dangerous for the disk contents - you can easily erase the
drive (including format), make sure you are in telnet/ssh session with the
camera, not in your computer console (and you are not running your computer
as root)

You can copy data, I would recommend to use "/dev/circbuf" as a source file
- it is 19MB pseudo-file that is just contents of the system memory, so the
result speed reported by dd  will not be influenced by reading from the
drive, just writing


> How can I decode jp4? The binary elphel_dng can't handle it.
>
> I did not use it much myself so far (will do that shortly - after finishing
upgrading the camera fpga/drivers fro the mulrtisensor modes ). Meanwhile I
would have to  search our wiki myself to find an answer. Paulo will be able
to help you more with this - he developed the latest decoding software.


> Does the jp4-hdr mode work with the MT9P001? What gain is set for G2 and
> how can the data be decoded?
>

Yes, it was designed and tested with that sensor, but tehre definitely may
be some software glitches. And you'll need to disable automatic control of
the second green (by default it is adjusted so the output from both G1 and
G2 are the same (on the histogram)


> Can the parts of the Eyesis project already be bought?
>

We are still struggling to get all the parts for the first 3 prototypes,
some are still missing. And we are deep in the software development - the
code is written, but there are still some bugs that have to be dealt with.
You may write Olga about particular parts, she can help you better with
their status


Andrey
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