Media files with .jpeg, .gif, .ogg, .webm formats cannot be viewed in preview

[jasson99]

Describe the bug

Media files with extensions such as .jpeg, .gif cannot be viewed, only the ones with .jpg and .png can be viewed.

Steps to reproduce

Steps to reproduce the behavior:

1. upload an image file, say screenshot.jpeg to https://localhost:9200/

2. The thumbnail for screenshot.jpeg is not visible
   

3. Click on screenshot.jpeg

4. The image is not visible, and a red-exclamation sign is present.
   

5. Rename screenshot.jpeg to screenshot.png or screenshot.jpg

6. The thumbnail is visible (try reloading)

7. Click on the renamed file screenshot.jpg
8. The image is visible
   

Expected behavior

The thumbnail and image should be visible for all media formats including .jpeg

Actual behavior

Thumbnail and image are not visible in the case of .jpeg files

[jasson99]

The previews are not visible in all of the above-mentioned file formats. However, when clicked on the file, .ogg and .webm media files can be viewed while the .jpeg and .gif file contents are not visible and a red exclamation sign can be seen.

[swoichha]

@jasson99 For latest master jpeg image is supported. We can see the previews and the image can be viewed when opened in media viewer .

[C0rby]

jpeg and gif files should be working now.

[pascalwengerter]

Look at #4667 for more information

[kulmann]

Not reproducible anymore (for the image types). The preview app still doesn't support webm files, but that is because there is no reliable native browser playback support, so that's "unsupported by product decision" as of now. Might be added later as a feature.