{"OCRExitCode":99,"IsErroredOnProcessing":true,"ErrorMessage":["Some
> internal processing error occurred. Please give us some time, we are
> looking into
> this!"],"ErrorDetails":"","ProcessingTimeInMilliseconds":"343"}
The OCR API can not automatically determine the image file type (here: JPG). So the solution is to tell the OCR API about it. You do this with the filetype=JPG parameter.
That said, the filetype parameter does not work since the last update due to a regression bug - we found out about this last week and already fixed it. The fix will be available on the production servers in a few days. I will update this ticket once available. The PRO and PRO PDF endpoints are not affected by this issue.