WIC return WINCODEC_ERR_PROPERTYUNEXPECTEDTYPE when it tried to load the file.
Since it is not my code I can't dig down to exactly what, AI also said it had bad metadata. and then I did not tell it what WIC also said that. so both of them say that.
I don't care exactly what in meta data is bad. It does not matter for me. It is not my code so I can't modify it anyway.
The code is part of Windows, All MC do is to use API calls provided by Windows. So if it is a bug in the loader. Then It is in Microsoft code. And I don't have access to that.
However, What I might be able to do is it add a fallback load method that will try to load the image without the metadata.
Told AI to analyze it again.. and to show where the error is, And it wrote script to validate it and gave this result
----------------------------------------------------
JPEG segments:
FFE0 at 2 len 16 b'JFIF\x00\x01\x01\x01\x00H\x00H'
FFFE at 20 len 63 b'CREATOR: gd-'
FFE1 at 85 len 2005 b'Exif\x00\x00II*\x00\x08\x00'
FFDB at 2092 len 67 b'\x00\x06\x04\x05\x06\x05\x04\x06\x06\x05\x06\x07'
FFDB at 2161 len 67 b'\x01\x07\x07\x07\n\x08\n\x13\n\n\x13('
FFC0 at 2230 len 17 b'\x08\x02\xbc\x01\xd3\x03\x01"\x00\x02\x11\x01'
FFC4 at 2249 len 31 b'\x00\x00\x01\x05\x01\x01\x01\x01\x01\x01\x00\x00'
FFC4 at 2282 len 181 b'\x10\x00\x02\x01\x03\x03\x02\x04\x03\x05\x05\x04'
FFC4 at 2465 len 31 b'\x01\x00\x03\x01\x01\x01\x01\x01\x01\x01\x01\x01'
FFC4 at 2498 len 181 b'\x11\x00\x02\x01\x02\x04\x04\x03\x04\x07\x05\x04'
SOS at 2681
TIFF header b'II' magic 42
[IFD0] at offset 8, 2 entries
0x0132 DateTime ASCII count=20 @38 b'2012:03:07 10:23:20\x00'
0x8769 ExifIFDPointer LONG count=1 inline (58,)
[ExifIFD] at offset 58, 0 entries
[IFD1 (thumbnail)] at offset 64, 3 entries
0x0103 Compression LONG count=1 inline (6,)
<-- WRONG TYPE, expected SHORT 0x0201 JPEGInterchangeFormat LONG count=1 inline (106,)
0x0202 JPEGInterchangeFormatLength LONG count=1 inline (1891,)
PROBLEMS:
IFD1 (thumbnail) tag 0x0103 Compression: LONG count=1 <-- WRONG TYPE, expected SHORT
parsed the file's EXIF data with a script. One thing is actually wrong: the thumbnail's Compression tag is stored with the wrong data type.
The file is small (14,665 bytes, 700×467). It was saved by PHP's GD library (the comment says CREATOR: gd-jpeg), with a short EXIF block added afterwards
┌───────────────────┬────────────────────────────────────┬─────────────────┬──────────────────────────────────────────────────────┐
│ Block │ Tag │ Stored as │ Status │
├───────────────────┼────────────────────────────────────┼─────────────────┼──────────────────────────────────────────────────────┤
│ IFD0 (main image) │ DateTime = 2012:03:07 10:23:20 │ ASCII, 20 chars │ OK │
├───────────────────┼────────────────────────────────────┼─────────────────┼──────────────────────────────────────────────────────┤
│ IFD0 │ ExifIFDPointer → offset 58 │ LONG │ OK │
├───────────────────┼────────────────────────────────────┼─────────────────┼──────────────────────────────────────────────────────┤
│ Exif IFD │ (0 entries) │ — │ Empty but parses fine │
├───────────────────┼────────────────────────────────────┼─────────────────┼──────────────────────────────────────────────────────┤
│ IFD1 (thumbnail) │ Compression = 6 (JPEG) │ LONG │ ❌ The EXIF/TIFF spec requires SHORT │
├───────────────────┼────────────────────────────────────┼─────────────────┼──────────────────────────────────────────────────────┤
│ IFD1 │ JPEGInterchangeFormat = 106 │ LONG │ OK │
├───────────────────┼────────────────────────────────────┼─────────────────┼──────────────────────────────────────────────────────┤
│ IFD1 │ JPEGInterchangeFormatLength = 1891 │ LONG │ OK; the thumbnail fits exactly inside the EXIF block │
└───────────────────┴────────────────────────────────────┴─────────────────┴──────────────────────────────────────────────────────┘
The value itself (6 = JPEG) is correct; only the type is wrong. Lenient readers like libexif, exiftool and browsers just read the number. WIC checks the type against its schema and returns WINCODEC_ERR_PROPERTYUNEXPECTEDTYPE.
The rest of the file is fine: the JPEG structure, quantization and Huffman tables, and frame header are all valid.
----------------------------------------------------
and looking at
http://www.fifi.org/doc/jhead/exif-e.html#IFD1Tags for spec
0x0103 Compression
unsigned short 1 Shows compression method. '1' means no compression, '6' means JPEG compression.
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