Mataki na 1: Loda naka MP4 fayiloli ta amfani da maɓallin da ke sama ko ta hanyar ja da sauke su.
Mataki na 2: Danna maɓallin 'Maida' don fara hira.
Mataki na 3: Sauke fayil ɗin da aka canza 3GP fayiloli
MP4 zuwa 3GP Tambayoyin da ake yawan yi game da Canzawa
Ta yaya zan canza MP4 zuwa 3GP ba tare da sake-saukar da saukar bidiyo ba?
+
Idan MP4 da 3GP na iya ɗaukar codec guda (H.264, H.265, VP9, AV1), mai maida zai koma zuwa wani remux: ana kwafe maganganun farko bayt-by-bayt cikin 3GP kuma kawai mai riƙe da shi ya canja. Wani remux na 1 GB MP4 zuwa 3GP na iya ƙarewa cikin sakan 5-15 da asarar inganci. A kusa da kowace MP4 a cikin daji ne H.264 bidiyo da AAC sauti; da kwandon kuma doka da aka riƙe HEVC, AV1 da VP9. 3GP yana da H.263 ko MPEG-4 Sashe na 2 bidiyo tare da AMR narrowband magana sauti, duk tuned ga mafi ƙarancin bitrate fiye da inganci.
An iya canja MP4 zuwa 3GP ba tare da sake encoding bidiyo ba?
+
Ya, kuma wannan shi ne hanya mai sauri. MP4 da 3GP suna raba irin wannan tsari na akwatin da ke ƙasa, don haka ana kwafe bidiyon da sauti a cikin bayt-by-byte kuma kawai an sake rubuta ƙofar ƙofar. Ba a decode komai ba kuma ba a sake ƙuntata komai ba, don haka fayil mai tsawo na fasali zai ƙare cikin minti daya a maimakon awa daya, tare da ingancin fitarwa na daidai da na asali. MP4 ne ISO/IEC 14496-14, standardized a cikin 2001 da kuma dauke daga irin QuickTime akwatin zane MOV amfani. 3GP shi ne mai riƙe da 3GPP standardized ga farko wayar hannu, lokacin da bidiyo ya kamata ya dace da 176x144 allon da 2G data plan.
Me ya faru da waƙoƙin sunaye-na-ƙasa a cikin fayil ɗin MP4 na?
+
Ba za su iya zama masu zabar, saboda 3GP ba ta da wani maɗauki na sautin-ƙasa don a riƙe su. Akwai hanyoyi biyu na fita: ka ƙona su cikin bidiyo yayin canjawa, wanda zai sa su zama na daɗaɗɗa kuma ba za a iya amfani da su ba, ko ka fitar da su kamar wani.srt daban tare da 3GP domin mai wasa ya kunna. Mai canjawa zai gaya maka abin da ya yi ba tare da ya rufe su ba. An hana 3GP a cikin matsaloli masu ƙaranci da sauti mai darajar magana; ƙara girman shi ba zai dawo da bayani ba wanda ba'a taba kamawa ba.
Shin, zan iya shigar da fayil a cikin wani shafi na yanar gizo bayan na canja MP4 zuwa 3GP?
+
Ba kai tsaye ba. MP4 yana wasa cikin layin cikin duk wani mai bincike; 3GP ba haka ba ne, don haka wani shafi mai shigar da shi zai koma zuwa wani alaƙa na saukewa ko wani firam na mai wasa ba. Idan fayil ɗin ya kasance an tsara shi ga wani shafin yanar gizo, ka riƙe MP4 don yanar gizo kuma ka yi amfani da 3GP kamar arshiya ko gyara kwafin.
Me ke faruwa da sauti mai 5.1 surround idan an canja MP4 zuwa 3GP?
+
An yi masa haɗewa zuwa stereo, saboda 3GP ba shi da hanya mai aminci ta kananan hanyoyi da yawa. An yi amfani da ma'aunin ITU na gabaɗaya don haka zauren magana a cikin kananan hanyoyi na tsakiya yana da fahimta kuma masu kewaye suna zuwa a matakin da aka rage ba tare da su faɗi ba. Duk wani abu da ya dogara da wurin kananan hanyoyi na daban ya tafi bayan wannan.
Shin waƙoƙin sauti masu yawa za su iya tsira daga canji daga MP4 zuwa 3GP?
+
Na'am — duk waƙoƙin sauti a cikin MP4 (waƙoƙin mai shiryawa, yarukan dabam, waƙoƙin bayani) ana kiyaye su a cikin 3GP idan mai nema na goyon bayan waƙoƙin sauti masu yawa. MKV da MOV suna kula da waƙoƙin sauti ba tare da iyaka ba; MP4 yana goyon bayan da yawa amma wasu masu wasa da na'urorin haɗi suna ganin waƙoƙin 1 kawai; WebM ana hana shi a waƙoƙin Opus / Vorbis guda.
An riƙe waƙoƙin sunaye-na-ƙasa idan an canja MP4 zuwa 3GP?
+
Subtitles soft (tracks da ake iya zãɓewa) suna tsira idan 3GP zai iya ɗaukar su: MKV yana da SRT, ASS, SSA, PGS, VobSub a matsayin native; MP4 yana da mov_text kawai (farashin da aka rufe). Canja MKV tare da ASS styled subs zuwa MP4 zai iya sa su kasa zuwa mov_text ko kuma a toshe su. Hardsubs (an toshe su cikin bidiyo) suna tsira duk da haka.
Shin MP4 zuwa 3GP na dauke da alamomin babi / DVD-style nasarar?
+
Metadata na babi na canja tsakanin MP4 da 3GP duk lokacin da bangarorin biyu ke goyon bayan wani atom na babi (MKV, MP4, MOV). WebM na adana babi a cikin wani ɓangaren da ya dace da Matroska, don haka MKV <-> WebM na dauke da babi-zuwa-baya cikin tsabta. AVI ba shi da wani bayani na babi, don haka canja AVI zuwa 3GP zai samar da fayil da ba a raba shi ba sai idan ka ƙara alamun shafi da hannu.
Me ya faru da canzawa daga MP4 zuwa 3GP?
+
MKV shi ne mai sarrafa maɓallin maɓalli kawai wanda ke adana fayilolin da aka haɗa (TTF fonts for ASS subs, JPG cover art, fan-translated PDF inserts). Zuwa daga MP4 zuwa 3GP yana daure waɗannan maɓallan idan 3GP bai zama MKV ba — maɓallan elemental na canjawa, amma nauyin da aka haɗa yana zaune a cikin tushen. Ka riƙe MP4 a matsayin madadin idan kana dogara da maɓallan da aka haɗa.
Mene ne kodeki na fitarwa 3GP ke amfani da shi bisa diff?
+
An zaɓi codec ɗin diff don ya haɗu da mai riƙe 3GP da kyau: MKV diff zuwa H.265 (HEVC) don mafi kyawun ƙuntata; MP4 diff zuwa H.264 don mafi faɗin goyon baya na na'ura; WebM diff zuwa VP9; AVI yana amfani da MPEG-4 ASP (DivX/Xvid lineage). Yaƙin neman zaɓe ta hanyar jerin kayan aikin codec na ci gaba — AV1 yana da samuwa ga MKV / WebM inda kake so mafi girman ƙuntata kuma zaka iya jira ta hanyar ƙuntata. 3GP fayiloli ne ƙarami da decode a kan mafi rauni kayan aiki iya tunanin, wanda shi ne dalilin da sauki wayoyin da low-end wayoyin hannu har yanzu rikodin shi.
Ta yaya HDR (HDR10, Dolby Vision) zai iya tsira daga MP4 zuwa 3GP?
+
Metadata na HDR na canzawa (HDR10 masu nuna kimar, matsakaicin matsakaicin matsakaici) yana tafiyar da 3GP idan kowace ƙuƙumma da codec ɗin da aka zaɓa suna goyon baya (HEVC, AV1 a cikin MKV / MP4). Dolby Vision yana da tsananin rauni — siffar DV 5 / 7 / 8.1 a cikin MP4 tana da ƙarfi kawai a cikin MKV tare da HEVC; canjawa zuwa ƙuƙumma 3GP da ba ta da ɗakin DV yana daidaita zuwa HDR10.
Shin mai canza MP4 zuwa 3GP zai riƙe saurin firam mai canzawa (VFR)?
+
MKV da WebM suna rikodin lokaci-da-firam na gaskiya kuma suna kula da VFR na asali, don haka MP4 VFR yana tsira cikin 3GP daga cikin waɗannan sifofin ba tare da sake-samuwa ba. MP4 na adana lokaci-da-samuwa kuma amma wasu masu wasa suna tsammanin CFR; mai maida yana nuna wani "ciwon CFR" toggle wanda ke sake-samuwa VFR MP4 zuwa 24 / 30 / 60 fps 3GP ga burin da ke da matsala.
3GP shine tsarin kwantena multimedia da aka kirkira don wayoyin hannu na 3G. Yana iya adana bayanan sauti da bidiyo kuma ana amfani da shi don sake kunna bidiyo ta hannu.
