Leyo nombolo ngayinye isho ukuthini
Isilinganiso samafremu yizingane zezithombe eziboniswa ngomzuzwana owodwa. Ezine ozihlangabezana nazo kakhulu:
Lapho u-0.1% uvela khona
23.976 = 24 × 1000/1001, kanti 29.97 = 30 × 1000/1001. Leyo-1000/1001 iyinsalela yokungeza umbala ku-NTSC: ukuze ufake isithwali sombala ngaphandle kokuphula abamukeli abamnyama nabamhlophe abakhona, isilinganiso senkundla sehliswa sisuka ku-60 Hz saya ku-59.94 Hz (60 × 1000/1001), kanti isilinganiso samafremu sehle kanye naso.
Umphumela: amafilimu asakazwa ku-23.976 ezifundeni ze-NTSC esikhundleni sika-24. Umehluko ngu-0.1%, noma imizuzwana engu-3.6 ngehora — ubonakala kanzima yedwa, kodwa ungawudida no-4% ongezansi futhi ungalokothi uhlanganise lezi zibili ekubaleni okukodwa.
Lapho u-4% uvela khona
Izifunda ze-PAL zibukisa ku-25 fps. Amafilimu adutshulwa ku-24 fps futhi adlalwa nje ku-25 — akukho fremu eyodwa eyengeziwe noma esusiwe, ngakho ukudlala kusebenza ngokushesha ngo-4% (25/24 ≈ 1.0417). Ifilimu yemizuzu eyi-100 isebenza imizuzu engu-96 enguqulweni yayo ye-PAL.
Lowo ungumgogodla wesi progressive drift: amagama-ncinci enzelwe umthombo wokuqala nevidiyo enguqulweni ye-PAL afana ncamashi ekuqaleni futhi ahlukene ngemizuzu emine ngesikhathi samakhredithi. Akukho ukushintsha komhlaba wonke okungasindisa lokho; kufanele kulinganiswe kabusha ngesilinganiso.
Uyiguqula kanjani
Ukuguqula kusho ukubuyabuyelela ngesilinganiso esisodwa esisebenza kuyo yonke ifilimu:
Ukutshela ukuthi uneyiphi
Esikhundleni sokuqagela isilinganiso, thola izikhathi ezimbili isikhathi sazo esifanele oqinisekile ngaso — ngokuvamile imigqa yokuqala neyokugcina yengxoxo — bese utshela ithuluzi "lo mugqa kufanele ube ku-00:00:12 kanti lowo ku-01:35:40"; liyelula ifilimu yonke ngomugqa oqondile phakathi kwalokho okubili. Lokho kuthiwa "i-two-point anchoring", futhi akudingi i-arithmetics yesilinganiso samafremu kuwe.
Ukuze uqinisekise isilinganiso samafremu wena uqobo, hlola umdlali wakho noma ithuluzi lolwazi lwemidiya. Uma igama lefayela elifana ne-`1080p.WEB` lingaphethi icebiso ngesilinganiso samafremu, i-two-point anchoring iyindlela ephephile.
Amathuluzi ahlobene nemihlahlandlela
Ukuguqulwa kwesilinganiso samafremu uqobo — Subtitle frame rate conversion; ukulungiswa kwesivinzi — Subtitle speed conversion; ungaqiniseki ukuthi kuwukushintsha komhlaba wonke noma ukukhula okuqhubekayo — Subtitles drifting further out of sync.