Comments (8)
@bartbutenaers You might be interested to hear that Node-RED has recently introduced Debian-based images and ImageScript works fine with them.
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I assume I am completely using this library in the wrong way.
Because the wasm index.js file only contains 1 statement (throw new Error('todo!');
):
And even if would have passed through that point, then further on I would have got the same exception a bit further in the code (whether I set the environment variable or not doesn't matter):
My creativity has reached its limit. Hopefully you can illuminate me ;-)
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Ok it seems to work when I don't use @imagescript/codecs
directly, but instead the imagescript
which also seems to contain the codecs.
- So I assume the
@imagescript/codecs
is not to be meant to use as a standalone library? - And is it correct that I need simply to add
process.env['CODECS_FORCE_WASM'] = 1;
before I load imagescript?
Thanks!!
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The ImageScript codecs currently don't include a WASM implementation (it's still WIP), so i'm not sure if it will work with node-red (not sure if it would be running server side or in a node-red dashboard (client side)). It would have to run on a supported platform
() with the native modules (./codecs/node/index.js
), but accessing those directly isn't really supported (or documented) right now.
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Hi @matmen,
Thanks for your quick response!!
The ImageScript codecs currently don't include a WASM implementation (it's still WIP)
Ah I wasn't aware of that. Because from the benchmarks on the readme page, I had concluded that WASM was already implemented for encoding and decoding... I am certainly not going to ask an open-source developer for an ETA ;-). But is this something you are working on, or is in the category 'maybe later maybe never'? In the latter case, I need to look for another solution? Which would be a pity, because I don't think there is another wasm solution ...
not sure if it would be running server side or in a node-red dashboard (client side)
Are you familiar with Node-RED somehow?
I would like to use this on the server side. Currently almost all image processing nodes in Node-RED handle their own encoding/decoding (mostly with jpeg-js). Although that is a very nice library, I have two problems with it:
- It is just too slow when you want to do video surveillance with a bunch of cameras.
- If every node does decode -> image processing --> encode, then a lot of cpu is being wasted because you get a series of decodings and encodings after each other.
I had hoped to develop a new node that could decode/encode images based on your library and wasm. So I first would decode the jpegs to raw images, then add multiple nodes in a chain that do processing on that raw image, and at the end a node to encode the (processed) raw images back to a jpeg:
This way we would only have one decoding, and one encoding. And both based on wasm for better performance.
Do you think something like that is a bit realistic? Because I would like to avoid native libraries (like sharp....), because when you e.g. run Node-RED in an (Alpine Linux Docker) there aren't even build tools available. So wasm would be a great alternative ...
from imagescript.
codecs package wasm support is blocked by ongoing imagescript port to rust
for now you can vendor in and modify our current wasm jpeg encoder/decoder to fit your needs
from imagescript.
@bartbutenaers Are you currently using ImageScript successfully with Node-RED? Can you offer any guidance in my issue #30?
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@AndreKR,
Unfortunately - due to lack of free time - I did not continue with this.
Bart
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