Experimental Physics and
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<== Date ==>		<== Thread ==>

Subject:	Compressed image without NDPluginCodec
From:	"Nariyoshi, Pedro via Tech-talk" <tech-talk at aps.anl.gov>
To:	"tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date:	Fri, 13 Feb 2026 20:29:04 +0000

Hello all,

I have been trying to create a records to display an image on a CS-Studio Phoebus screen. The problem is that transmitting the waveforms directly is quite bandwidth intensive. For our cameras, we tend to use NDPluginCodec with NDPluginPva, which works fairly well, but I would like to avoid having to write some glue code to send the waveforms to a dummy asynNDArrayDriver. I have been trying (without much success) to do it. I have tried creating a json to load via dbLoadGroup and via p4p, but as soon as I set the codec to jpeg and try to send compressed data, everything stops working: nt.wrap doesn't like the compressed data, and I am having trouble getting the json to have a structure that Phoebus will recognize. Does anyone have experience with this? Or maybe a suggestion on how to get compressed data to display on Phoebus screens?

Best regards,

Pedro Nariyoshi

Software Controls Engineer

Facility for Rare Isotope Beams

Michigan State University

640 South Shaw Lane

East Lansing, MI 48824, USA

Tel. 517-908-7352

Email: nariyosh at frib.msu.edu

1633986722804