On the slim devices forum it is suggested that there are two different methods for embedding cover art into a flac file, one of which is preferable:
"If you're going to embed cover art, I'd use FLAC's preferred method over the Vorbis comment method. The former is more likely to enjoy widespread support with the passing of time."
Is this true? If so, which method does MP3tag use?
On a related question, does the compression level of a jpg cover image affect how much space the image takes in the flac file? If the image is 300x300 pixels and takes 50KB of space on disc as a jpg image, how much padding should one insert into the file to accommodate the image? (The compression question relates to whether the 50KB matters, or whether all that matters is the image size (300x300).) One persion on the slimserver forum suggested adding 20KB of padding which seems too little.