We are migrating DAM content from 6.1 to 6.4 and most of the existing DAM images in 6.1 have jcr:mimeType as application/octet-stream. (Ex: /content/dam/projects/we-retail/cover/jcr:content/renditions/original/jcr:content) Issue: AEM6.4 DAM Asset Update Workflow does not generate thumbnails for images having jcr:mimeType (application/octet-stream) but AEM 6.1 does.
Expected: AEM6.4 DAM Asset Update Workflow should generate thumbnails for 'application/octet-stream' mime type images.
Please refer to "jcr:mimeType" property, if you change from application/octet-stream to image/png and re-run the Update Asset workflow the thumbnail images are generated.
Note: Applied AEM 6.4.3 service pack.
Any workaround would be helpful, apart from writing script to update jcr:mimeType from 'application/octet-stream' to 'image/jpeg' (image/jpeg, image/jpg, image/png, image/gif, tiff, etc.,).