fetchart: Choose / convert image formats

[translit]

At present, the fetchart plugin is oblivious to the format of the images it downloads. While JPG is most common, one may come across cover art in other formats too. For example, MusicBrainz carries GIF, JPG, JPEG, PNG, HTM, HTML, JPE, JFIF and PDF.

Some players, notably in-car entertainment systems, may be picky about the format they display. For example, BMW supports JPG but not PNG. Hence the need to convert the downloaded cover art.

It would be useful if the fetchart configuration had two extra options:

• format: Download images of this format only (gif, jpg, jpeg, png, htm, html, jpe, jfif, pdf)
• convert_to: Convert downloaded image to this format (gif, jpg, jpeg, png, htm, html, jpe, jfif, pdf)

[sampsyo]

Thanks! FWIW, the plugin is not entirely unaware of formats. It actually has a hard-coded list of legal file formats: currently, just PNG and JPEG. Others will not be downloaded:

beets/beetsplug/fetchart.py

Lines 44 to 47 in ce40d85

	CONTENT_TYPES = {
	'image/jpeg': [b'jpg', b'jpeg'],
	'image/png': [b'png']
	}

But making this configurable, and supporting conversion, would be a good idea.

[fabsmusicjunkie]

i would be interested in this feature or a workaround, too.