I suspect 'BBC World' are merely producing the broadcast and that the live coverage will be available on the following channels in there respective countries. (As per fa website)
The FA Cup will be broadcast in the UK on BBC and BT Sport
The FA Cup Abroad
France: beIN Sport;
Greece: TBC
Holland: Eredivisie;
Norway: TV2;
Iceland: 365 Media;
Denmark: SBS Media;
Sweden: Viasat
Austria: ORF (Final only)
Belgium: Telenet & BETV;
Germany: Eurosport;
Italy: Fox
Portugal: Sport TV;
Turkey: TRT & TT Net;
Middle East: BeIN Sport;
Israel: Charlton;
Mexico, Guatalemala, Honduras, Nicaragua, Costa Rica, Panama, Dominican Republic, El Salvador: Sky Mexico;
Brazil, Argentina, Bolivia, Chile, Colombia, Ecuador, Paraguay, Peru, Uruguay: ESPN;
Australasia: ESPN;
Indian Subcontinent: Star Sports;
Malaysia: Astro;
Japan Fox;
South Korea: SBS;
Myanmar: Shwe Lan Thin Sky Net;
Indonesia: BeIn, SCTV (Semi & Final Only)
Hong Kong: PCCW
Singapore: SingTel;
Vietnam: Ho Chi Minh TV; SCTV: VSTV, VTV
Phillipines: BeIn Sport
China: GDTV, Tencent (online), Sohu (Online) PPTV (online) and Sina (online);
Russia: RTR;
Armenia: Armenian Second TV Channel;
Azerbaijan: AZTV;
Bosnia: Sportklub;
Bulgaria: Nova Sport;
Croatia: Sportklub;
Czech Republic: Nova Sport;
Georgia: Setanta;
Hungary: Sport1
Kazakhstan: Setanta;
Tajikistan: Setanta;
Turkmenistan: Setanta;
Uzbekistan: Setanta;
Kyrgyzstan: Setanta;
Macedonia: SportKlub;
Moldova: Setanta ;
Montenegro: Sportklub;
Romania: Pro TV;
Serbia: Sportklub;
Slovakia: Nova Sport;
Slovenia: Sportklub;
Ukraine: TRK;
Poland: Orange;
US & Caribbean: FOX Sports 1, FOX Sports 2 and FOX Soccer Plus
Canada: Rogers Sportsnet;
Africa: Supersport;
Thailand: BBTV
Mauritius: MBC
Read more at
http://www.thefa.com/thefacup/more/tv#f5P9W3LRQCbKrM4Y.99