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Do you have a live test case? If not, can you share the response from api.php?format=jsonfm&action=query&prop=imageinfo&iiprop=extmetadata&titles=<filename> ?

The problem is still present in version 0aab988 (10.07.2014).

I am now going to try the api.php?format=jsonfm&action=query&prop=imageinfo&iiprop=extmetadata&titles=<filename> call.

(In reply to Tisza Gergő from comment #1)
> Do you have a live test case?
No
> If not, can you share the response from
> api.
> php?format=jsonfm&action=query&prop=imageinfo&iiprop=extmetadata&titles=<file
> name> ?

Yes please:


{
    "query": {
        "pages": {
            "-1": {
                "ns": 0,
                "title": "Greensmoothie1.jpg",
                "missing": ""
            }
        }
    }
}

This image results in 

[object Object] [object Object]

on the MMV page.

Could you paste the API response again, with "File:" included on the file name? i.e.

api.php?format=jsonfm&action=query&prop=imageinfo&iiprop=extmetadata&titles=File:Greensmoothie1.jpg

{
    "query": {
        "pages": {
            "15668": {
                "pageid": 15668,
                "ns": 6,
                "title": "File:Greensmoothie1.jpg",
                "imagerepository": "local",
                "imageinfo": [
                    {
                        "extmetadata": {
                            "DateTime": {
                                "value": "2014-05-26T17:09:14Z",
                                "source": "mediawiki-metadata",
                                "hidden": ""
                            },
                            "ObjectName": {
                                "value": {
                                    "_": "160592163"
                                },
                                "source": "file-metadata",
                                "hidden": ""
                            },
                            "iimVersion": {
                                "value": 2,
                                "source": "file-metadata",
                                "hidden": ""
                            },
                            "Source": {
                                "value": {
                                    "_": "iStockphoto"
                                },
                                "source": "file-metadata",
                                "hidden": ""
                            },
                            "Artist": {
                                "value": {
                                    "_": "pilipphoto"
                                },
                                "source": "file-metadata"
                            },
                            "SpecialInstructions": {
                                "value": {
                                    "_": "NR"
                                },
                                "source": "file-metadata",
                                "hidden": ""
                            },
                            "Credit": {
                                "value": {
                                    "_": "Getty Images/iStockphoto"
                                },
                                "source": "file-metadata",
                                "hidden": ""
                            },
                            "ImageDescription": {
                                "value": {
                                    "_": "Healthy green smoothie"
                                },
                                "source": "file-metadata"
                            }
                        }
                    }
                ]
            }
        }
    }
}

Thanks! The expected format would be

    "Artist": {
        "value": "pilipphoto",
        "source": "file-metadata"
    }

so something weird must be going on with the EXIF data. Could you share the image?

This is still happening, e.g. on this file:
https://en.wikipedia.org/wiki/Guglielmo_Marconi#mediaviewer/File:Guglielmo,_Marchese_Marconi._Colour_lithograph_by_Sir_L._War_Wellcome_V0003849.jpg