Support m4a cover art

[TenLeftFingers]

An album I downloaded from 7digital does not display album art for the m4a version, but does for the mp3 version. m4a art displays fine in the file manager on the desktop (win / Ubuntu).

I've tried other m4a in my collection and get the same result.

[Victor Thompson (vthompson)]

Hi, the ability to display the cover art for differing files is either a function of the Thumbnailer or possibly the Mediascanner service. I've marked the Thumbnailer service as affected so they can take a look if possible.

[Michi Henning (michihenning)]

Can you tell us exactly what artist and album you used or, even better, could you attach the media file.

This would help us figure out what's going on.

Thanks,

Michi.

[TenLeftFingers (tenleftfingers)]

Apologies, my email reply didn't make it to launchpad it seems. Maybe because of the attachments.

I'll attach two files. One from The Art of Mindful Living by Thich Nhat Hanh (don't remember where I got that one) and Space Trix, Vol. ' by Various Artists (purchased from 7 Digital using the scope on a BQ E4.5).

Thanks guys,
Jarlath

[James Henstridge (jamesh)]

So, running gst-discoverer-1.0 over one of your files, I get:

  Tags:
      ...
      preview image: buffer of 86005 bytes, type: image/png

In contrast, one of my MP3s with cover art

  Tags:
      ...
      image: buffer of 190244 bytes, type: image/jpeg, width=(int)800, height=(int)800, sof-marker=(int)0

So it looks like the image is exposed as GST_TAG_PREVIEW_IMAGE instead of GST_TAG_IMAGE via GStreamer.

To fix this, I'll need to (a) update mediascanner2 to check for both tags when deciding whether a file contains embedded art, and (b) update thumbnailer to extract from the preview image tag too.

[Michi Henning (michihenning)]

We have a fix for the thumbnailer, which now correctly deals with the breathing m4a.