def _embedded_frames(frame_list, frame_format):
    """frame_list should be a list of base64-encoded png files"""
    template = '  frames[{0}] = "data:image/{1};base64,{2}"\n'
    embedded = '\n'
    for i, frame_data in enumerate(frame_list):
        embedded += template.format(i, frame_format, frame_data.replace(
            '\n', '\\\n'))
    return embedded
