def get_file_info(f, stream, field):

    discoverer = GstPbutils.Discoverer()
    discoverer.connect('discovered', on_discovered)
    info = discoverer.discover_uri(f)

    for vinfo in info.get_video_streams():
        ftype = (vinfo.get_stream_type_nick())
        width = vinfo.get_width()
        height = (format(vinfo.get_height()))
        depth = (format(vinfo.get_depth()))
        framerate = ('Frate: {}'.format(vinfo.get_framerate_num()))
        bitrate = ('Brate: {}'.format(vinfo.get_max_bitrate()))
        par = vinfo.get_par_num()
        fname = vinfo.get_caps().to_string().split(',')[0]

    if stream == 'video':
        if field == 'duration':
            return str(convert_time(info.get_duration(), 'hh:mm:ss'))
        elif field == 'width':
            return str(width)
        elif field == 'height':
            return str(height)
        elif field == 'type':
            return str(ftype)
        elif field == 'depth':
            return str(depth)
        elif field == 'framerate':
            return str(framerate)
        elif field == 'bitrate':
            return str(bitrate)
        elif field == 'par':
            return str(par)
        elif field == 'name':
            return str(par)