3GP → WebM

Na'am — duk waƙoƙin sauti a cikin 3GP (waƙoƙin mai shiryawa, yarukan dabam, waƙoƙin bayani) ana kiyaye su a cikin WebM 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.

Subtitles soft (tracks da ake iya zãɓewa) suna tsira idan WebM 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.

Metadata na babi na canja tsakanin 3GP da WebM 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 WebM zai samar da fayil da ba a raba shi ba sai idan ka ƙara alamun shafi da hannu.

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 3GP zuwa WebM yana daure waɗannan maɓallan idan WebM bai zama MKV ba — maɓallan elemental na canjawa, amma nauyin da aka haɗa yana zaune a cikin tushen. Ka riƙe 3GP a matsayin madadin idan kana dogara da maɓallan da aka haɗa.

An zaɓi codec ɗin diff don ya haɗu da mai riƙe WebM 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.

Metadata na HDR na canzawa (HDR10 masu nuna kimar, matsakaicin matsakaicin matsakaici) yana tafiyar da WebM 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 3GP tana da ƙarfi kawai a cikin MKV tare da HEVC; canjawa zuwa ƙuƙumma WebM da ba ta da ɗakin DV yana daidaita zuwa HDR10.

MKV da WebM suna rikodin lokaci-da-firam na gaskiya kuma suna kula da VFR na asali, don haka 3GP VFR yana tsira cikin WebM 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 3GP zuwa 24 / 30 / 60 fps WebM ga burin da ke da matsala.

Same-codec remux na samar da girman da ya kusan daidai (cikin kwandon da ke da bambanci na 0.1-2%). Canjin codec na iya juya girman da 50% ko fiye: H.264 zuwa H.265 na iya raba fayil din da rabi da ingancin gani na daidai; H.264 zuwa AV1 na raba shi da rabi a kan wani ƙananan ƙayyadadden. Zuwa daga high-bitrate 3GP (Blu-ray rip) zuwa low-bitrate WebM (web upload) shi ne dalilin da ya fi yawa na daina aiki.

Na'am har zuwa 8K (7680x4320) akan Premium. Mataki na kyauta yana kula da 4K (3840x2160) har zuwa iyakar fayil na 1 GB. Remuxes na tsarki (dauke da codec guda) na 3GP mai girma zuwa WebM ana iyaka da shi ta hanyar I/O na diski, ba CPU ba — 3GP mai 30 GB na iyakance zuwa WebM cikin minti daya ko da yake da ma'aunin. Ana sake-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sauya-sa

Na'am — an yi aiki da fayilolin 3GP da aka tura a cikin masu aiki masu tsalle-tsalle kuma an share su cikin mintina na kammalawa. Ba za mu taba ganin, adana, riƙe, ko raba abun cikin ba. Ka duba /privacy/ don taga riƙe bayanan. Tashar canja wurin tana tafiya akan kayan aiki da muke kula da su daga ƙarshe zuwa ƙarshe; babu wani API na ɓangare na uku da zai karɓi fayil ɗinka.

Ba a cikin aikin guda ba - ka riƙe canji mai maida hankali kan kwandon / codec. Yi amfani da /trim/ don kakkabe 3GP farko, sa'an nan ka sanya mataki na 3GP -> WebM cikin jerin. Don haɗuwa da wasu kakkaben zuwa cikin WebM guda, kayan aikin /merge/ na haɗa su a kan tsarin kodeki-da-kodeki (ya sake haɗawa idan shigarwa suna raba kodeki, sake haɗawa idan ba haka ba) kuma ya fitar da fayil ɗaya WebM a ƙarshe.