Premature end of JPEG file

General Discussion Other

corpuscal..

in General Discussion • Other • 2 years ago

Hello,

I am trying to load JPEG files into processing while they are constantly being written onto my machine form an external camera. Problem is that sometimes, I load an image before it has finished being written to the machine. As a result, I load an image that is half gray, and is missing pixel data. When this happens, in the terminal, I get the warning message

"Premature end of JPEG file"

Which is good to know, but I need to check to see if the JPEG file is complete, before loading it, and if it is not a complete file, I need to wait for it to be finished written before I load it.

Any suggestions on how this can be achieved?

Thanks,

Jack

Replies(2)

PhiLho

Re: Premature end of JPEG file

2 years ago

If you can control the process of writing the files, you can write the files in a temp folder, then move them to the target directory. Move is much faster (if happening on same partition), so it should be OK.

corpuscal..

Re: Premature end of JPEG file

1 year ago

I was able to solve this simply by checking the color of the last pixel of the file. I found that when a file was not finished writing, the unwritten pixels would default to a specific gray color. If the last pixel of the file was this gray color, then I assume the file did not finish writing, and I try to read it again, until the color is not that gray color.

Not full-prood, but worked for me. As there is a 1 in 255x255X255 = 16.5 million chance that this color would naturally appear in the image. Those a pretty good odds, I think.

www.jackkalish.com

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