[Elphel-support] Record full res and stream compressed at the same time?

[David McPike]

Andrey, can you give me some advice or point me to documentation on how I
would accomplish the following:

- Run two compressors
- The compressor used by camogm would write JP4 raw or 100% JPEG quality
MJPEG images to disk
- Imgsrv would serve images at various JPEG qualities as we set them

Do I need to read circbuf frame metadata to figure this out?  What's the
right way?  Running multiple sensors in each camera isn't achievable at
this time.

Thanks!
David


On Sat, Jul 22, 2017 at 10:12 PM David McPike <davidmcpike at gmail.com> wrote:

> Hi Andrey,
>
> Our use case would be one sensor per camera, running around 10-12fps,
> recording video on local disk, and surface ROV pilot viewing streamed
> images.  I would like to maximize image quality stored on disk, while
> minimizing latency for images delivered to the surface on a limited
> bandwidth network path.  Using a single fps is totally fine.
>
> I can't recall our typical resoluition.  I don't feel like we ran the
> camera at full resolution in the past, so I'll keep your input in mind and
> try to finalize our requirements.
>
> Thanks much!
>
>
>
> On Sat, Jul 22, 2017 at 9:53 PM Elphel Support <
> support-list at support.elphel.com> wrote:
>
>> David,
>>
>> Do you mean resolution or JPEG quality?
>>
>> Different JPEG quality can be achieved with the same FPGA code, but
>> different software if you use less that all 4 channels - run 2 compressors
>> from the same sensor channel.
>>
>> Different resolution simultaneously can only be achieved if the sensor
>> runs at full resolution, and FPGA reduces resolution. That mode is not
>> implemented as it is limited to the same (lowest of 2) frame rate, defined
>> by the sensor. So it is not possible to combine low fps/high resolution and
>> high fps/low resolution from the same sensor, only what can be done is
>> similarly to 353 - short interruptions of the stream to get full resolution
>> images (simple application can record them to the ssd).
>>
>> Probably the most practical solution (having 4 sensor channels on the
>> same camera - dedicate one sensor for streaming, others - for high-res
>> recording.
>>
>> Andrey
>>
>> ---- On Sat, 22 Jul 2017 18:45:23 -0700 *David McPike
>> <davidmcpike at gmail.com <davidmcpike at gmail.com>>* wrote ----
>>
>> Hi All,
>>
>> I can't seem to find a clear explanation on this.  We are still primarily
>> using the 353 cameras.  Is there a way to locally record high quality
>> images via camogm and at the same time retrieve JPEG images with higher
>> compression via imgsrv?
>>
>> Thanks much,
>> David
>>
>>
>>
>> _______________________________________________
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>>
>>
>>
>>
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