Extract cover image from OGG file

I need to extract cover from OGG file.

I try to decode base64 string stored in METADATA_BLOCK_PICTURE tag, which I'm getting with following command:

vorbiscomment -R -e 1.ogg

Base64 decoding is working without errors, but resulting binary file is not opening neither like JPG, nor like PNG.

Example file: http://regress78.com/1.ogg