Chaza kafushane ukuthi ziyini izinhlaka ze-I, izinhlaka ze-B, nezinhlaka ze-P?
Context:Emkhakheni wokucindezela ividiyo ifreyimu yevidiyo icindezelwe kusetshenziswa ama-algorithms ahlukene anezinzuzo ezahlukahlukene kanye nokungalungi, okugxile kakhulu enanini lokucindezelwa kwedatha. Lawa ma-algorithm ahlukene amafreyimu evidiyo abizwa ngokuthi izinhlobo zesithombe noma izinhlobo zefreyimu. Izinhlobo ezintathu eziyinhloko zezithombe ezisetshenziswa kuma-algorithm ehlukene wevidiyo ngu-I, P no-B. Zihlukile kulezi zici ezilandelayo:  Amafreyimu e-I yiwona acindezeleka kancane kodwa awadingi amanye amafreyimu wevidiyo ukuze ahlukaniswe. Ama-P-frames angasebenzisa idatha evela kumafreyimu angaphambilini ukuze anciphise futhi acindezeleke kakhulu kunama-I-frames. Ama-B-frames angasebenzisa kokubili amafreyimu angaphambili nangaphambili ukuze kubhekiswe kudatha ukuze kutholakale inani eliphakeme kakhulu lokucindezela idatha.  Kunezinhlobo ezintathu zezithombe (noma amafreyimu) ezisetshenziswa ekucindezelweni kwevidiyo: amafreyimu e-I, e-P, ne-B.  I-I-frame (isithombe esifakwe ikhodi ngaphakathi) isithombe esiphelele, njengefayela lesithombe le-JPG noma le-BMP.  Uhlaka lwe-P (Isithombe Esibikezelwe) lugcina kuphela izinguquko esithombeni esivela ohlakeni olwedlule. Ngokwesibonelo, endaweni yesehlakalo lapho imoto ihamba khona phezu kwesizinda esimile, kuphela ukunyakaza kwemoto okudingeka kufakwe ikhodi. I-encoder ayidingi ukugcina amaphikseli angaguquki angemuva ku-P-frame, ngaleyo ndlela yonga isikhala. Ama-P-frame aziwa nangokuthi ama-delta-frame.  Uhlaka lwe-B (Isithombe Esibikezelwe Okwamabili) longa ngisho nendawo eningi ngokusebenzisa umehluko phakathi kohlaka lwamanje nohlaka lwangaphambilini nolulandelayo ukucacisa okuqukethwe kwalo.  Amafreyimu e-P ne-B abizwa nangokuthi amafreyimu e-Inter. Indlela amafreyimu e-I, e-P ne-B ahlelwe ngayo ibizwa ngokuthi iQembu Lezithombe.
Amafreyimu e-I, amafreyimu e-B, namafreyimu e-P yizinhlobo zamafreyimu evidiyo asetshenziswa kuma-codec evidiyo. Amafreyimu e-I angahlukaniswa ngaphandle kokubhekisela kwamanye amafreyimu. Ziyizincazelo ezizimele zohlaka olulodwa lwevidiyo. Ngakolunye uhlangothi amafreyimu e-P namafreyimu e-B abhekisela kwamanye amafreyimu futhi kufanele ahlukaniswe ngemuva kokuba amafreyimu abhekisela kuwo ahlukanisiwe. Amafreyimu e-P abhekisela kuphela kumafreyimu asekuqaleni kwevidiyo kanti amafreyimu e-B angabhekisela kumafreyimu asekuqaleni noma kamuva. Ngakho-ke ukuhumusha amafreyimu e-B kudinga ukuhumusha amafreyimu e-video ngokulandelana okuhlukile kokulandelana kokudlala.