Decoder chain should output specific error messages instead of the generic "Unable to decode input"

[olivervogel]

Solution approach (draft).

Premature termination of the decoder chain by “final” DecoderException, if it is clear that no further decoder will be successful.

For example

• Input is string
• Input is file path
• File path is not an image (no further decoding attempts necessary!)

[kamranlhr30]

is it fixed or not ?