I noticed that when I converted FLAC music with cover images into OGG, they wouldn't play on my smartphone anymore. After corresponding with the author of my music player app, I decided to create a small test suite to investigate.
Re-compile the samples using assemble_samples.sh (note the requirements).
In addition, create the _ET files by adding the respective images to
no_image.ogg using easyTag.
Here are the results:
| File | Mimetype | AMF | VLC |
|---|---|---|---|
| large_image.flac | audio/flac | ✓ | ✓ |
| large_image.mp3 | audio/mpeg | ✓ | ✓ |
| large_image.ogg | video/x-theora+ogg | ❌ | ✓ |
| large_image_ET.ogg | audio/x-theora+ogg | ✓ | ✓ |
| no_image.flac | audio/flac | ✓ | ✓ |
| no_image.mp3 | audio/mpeg | ✓ | ✓ |
| no_image.ogg | audio/x-vorbis+ogg | ✓ | ✓ |
| small_image.flac | audio/flac | ✓ | ✓ |
| small_image.mp3 | audio/mpeg | ✓ | ✓ |
| small_image.ogg | video/x-theora+ogg | ❌ | ✓ |
| small_image_ET.ogg | audio/x-theora+ogg | ✓ | ✓ |
| tiny_image.flac | audio/flac | ✓ | ✓ |
| tiny_image.mp3 | audio/mpeg | ✓ | ✓ |
| tiny_image.ogg | video/x-theora+ogg | ❌ | ✓ |
| tiny_image_ET.ogg | audio/x-theora+ogg | ✓ | ✓ |
Mimetype derived using mimetype.
Note that ffmpeg-built OGGs with image resolve to video!
Tried playing with Music Folder Player which uses Android Media Framework (AMF) and VLC. We note that AMF does not play ffmpeg-create OGGs with image, but it does the easyTag-tagged. VLC plays everything.
Ffmpeg-created OGGs do not carry the image; not even VLC shows them!
Another observation ID3 tags of ffmpeg-created OGGs with image seem to be broken on AMF; VLC has no problem.
It seems that ffmpeg or libvorbis have a problem,
or my parameters -codec:a libvorbis -qscale:a 6 -map_metadata 0 are somehow bad.
I posted a question on unix.SE.
easytag 2.4.2
ffmpeg 2.8.10
lame 3.99.5
libvorbis0a 1.3.5
metaflac 1.3.1
mimetype 0.27
Example files from publicdomainproject.org.