Save images as jpeg on a background thread

We want to save images as jpeg on a background thread. The method that unity sdk exposes cannot be run on a different thread. Do you know any other plugins/ open source projects of saving images as jpeg that we can use? (we found quite a few libraries that do not run on android)

 

I converted a javascript jpeg enconder a while ago (https://forum.unity.com/threads/convert-png-to-jpg-without-writing-to-disk.31737/) and someone else tidied it up and put the code here: https://github.com/AndreasBroager/unity-jpeg-encoder/releases/tag/Version1

It's all done in software so I don't see any reason why it wouldn't work on a thread.

 

Thanks. We did try it. It throws errors in the latest unity version and after some work it eventually encodes a cropped image

 

Ah, ok - it's been ages since I used it. If I get any free time I'll have a look at updating it.

 

p.s. I just loaded that github project into Unity 2018.2.21f1 and it seems to work fine for me (using the Test Encode scene). I didn't see any cropping and it worked threaded too. Are you testing the project on a PC? I also didn't spot any errors when it converted to 2018 from Unity 5.

If you want to post a cut down version of your project I can have a look at it and see if I spot any problems.

 

To be clear. I ported it from from unity javascript (as an exercise)
The repo is here: https://bitbucket.org/AndreasBL/unity-jpeg-encoder/src/master/ (With credits and etc)

But I don't do any active dev on it. Even though it is tempting, you know how it feels to look at your own old code
Anyway, unity has its own jpg encoder now.

 

It has its own jpg encoder but it's on the main thread, yours is multithreaded which is like a godsend, but indeed it throws errors at me too in JPGEncoder.cs.
Mainly :
IndexOutOfRangeException line 653 :

for (; (DU[i]==0) && (i<=end0pos); i++) {}

and
NullRefException Line 880:

mainBuffer.WriteBuffer( kvp.Value.buffer.GetAllBytes() );    

After some tests I noticed that sometimes the Value is null.

Tested on 2020.1.7f1.