MP4 → 3GP

He, ā, ko te huarahi tere. MP4 me 3GP e tiritiri ana i te hanganga kāwai ā-roto ōrite, kia tārua ai ngā aho whakaata me te oro oro puta noa i te paepae-ki-paepae, ā, ka tāruatia anō anake te whākōkī kāwai. Kāore he mea whakakōkī, ā, kāore he mea whakawhāiti anō, kia oti ai tētahi pūranga āhuatanga roa i raro i te minu i te wā o te wā kotahi, me te huaputa ā-whakahaere ki te pūtake. Ko MP4 te ISO/IEC 14496-14, i paerewa i te tau 2001, ā, i puta mai i te āhua o te kāwai pēnei i te QuickTime e whakamahia ana e MOV. Ko te 3GP te taiwhanga i whakaritea e te 3GPP mō ngā pūrere pāpāho o mua, i te wā e tika ana kia ōrite te ataata ki tētahi mata 176x144 me tētahi mahere raraunga 2G.

Kāore e taea te tīpako, nā te mea kāore he pūwhitinga pūāhua-whakaahua mārō a 3GP hei pupuri i a rātau. E rua ngā ara kia puta mai: ka whakamārō i a rātau ki roto i te ataata i te wā o te tahuritanga, e noho ai rātau ki te noho tonu, ki te kore āhua, ki te whakawātea rānei i a rātau hei.srt motuhake i te taha o te 3GP mō te pūpāho hei whakarewa. E kī ana te kaiwhakarere ki a koe he aha i mahi ai, kaua e whakawātea i a rātau. E whakawhāititia ana te 3GP ki ngā rongoā iti me te oro-whakahaere-whakahaere; kāore e whakaora ana i ngā taipitopito kāore anō kia whiwhi.

Kāore i te hāngai. MP4 e whakatangitangi ana i roto i ia kaitiaki; 3GP kāore, nā reira ka uru mai tētahi pou e whakatū ana ki tētahi pātahitanga whakahua, ki tētahi tākaro rānei. Mēnā kua whakaritea te faila mō tētahi wāhi, ka pupuri i te MP4 mō te Wīwī, ā, ka whakaarotia te 3GP hei pūranga, hei tārua whakarākei rānei.

Ka whakawāteatia ki te pūoro, nā te mea kāore he ara ā-maha e whakawhirinaki ana ki te 3GP. Ka whakamahia e te whakatata te taurite ITU paerewa kia noho ai te kōrero i te pūtoro matua, ā, ka tae mai te rohe ki te taumata iti iho, kaua e ngaro. He mea katoa e whakawhirinaki ana ki te tauwāhi pūtoro motuhake, kua ngaro i muri mai.

He — ko ia whakataki oro i roto i te MP4 (whakaaro a te kaiwhakahaere, reo whirinoa, oro whakaahua) ka tiakina ki te 3GP ina tautokona e te pūrere te oro-maha. MKV me MOV e whakahaere ana i ngā whakataki oro kāore i te whakawātea; he maha ngā MP4 e tautoko ana, engari ko ētahi kaiwhakaari pūrere e kite ana i te whakataki 1 anake; Ka whakawāteatia te WebM i te whakataki Opus / Vorbis kotahi.

Ka ora ngā whakahuatuhi māmā (ngā rererangi ka tīpakohia) ina taea e 3GP te mau i a rātou: MKV kei roto i te SRT, ASS, SSA, PGS, VobSub māori; MP4 kei roto anake i te mov_text (he hanga whakawātea). Ko te tahuritanga o tētahi MKV me ngā whakahuatuhi āhua ASS ki MP4 ka whakaiti i a rātou ki te mov_text, ka whakarewa rānei i a rātou. Ko ngā whakahuatuhi matatini (i whakarewatia ki roto i te ataata) ka mau i a rātou ahakoa pēhea.

Ka whakawhitia ngā raraunga meta i waenganui i te MP4 me te 3GP ina tautokona e ngā kāwai e rua tētahi ngota wāhanga (MKV, MP4, MOV). Ka penapena te WebM i ngā wāhanga i roto i tētahi kōpaka Matroska-hōpū, kia mārama ai ngā wāhanga MKV <-> WebM. Kāore he whakapūtā wāhanga a AVI, nā reira ka tahuri te tahuri AVI ki te 3GP i tētahi pūranga kāore i te whakarārangi, engari rawa ka tāpiri i ngā tohu ā-ringa.

Ko MKV te mea anake e pupuri ana i ngā pūkete whakapiripiri (ngā tātuhi TTF mō ngā tātai ASS, ngā toi kāwai JPG, ngā tāurunga PDF i whakamāoritia). E haere ana mai i te MP4 ki te 3GP ka whakapeka ēnei tātai ina kore te 3GP he MKV — ka tahuri ngā rerenga taketake, engari ka noho te utu whakapiripiri i te pūtake. Whakataki MP4 hei tiaki i ētahi atu tātai mēnā e whakawhirinaki ana ki ngā tātai whakapiripiri.

E kōwhiritia ana te pūnaha waeheretanga pūnoa hei ōrite ki te 3GP kaitakawaenga: MKV ngā pūnoa ki H.265 (HEVC) mō te whakawhāititanga pai ake; MP4 ngā pūnoa ki H.264 mō te tautoko pūrere whānui rawa; WebM ngā pūnoa ki VP9; AVI e whakamahi ana i te MPEG-4 ASP (DivX/Xvid lineage). Ka whakawātea mā te whakawātea codec hōhonu — Kei te wātea te AV1 mō MKV / WebM i reira e hiahiatia ana e koe te whakawhāititanga nui rawa, ā, ka taea te tūmanako mā te waehere. He iti noa iho ngā pūkete 3GP, ā, he whakakōrero i runga i ngā pūrere iti rawa e taea te whakaaro, ko te take e whakataki ana tonutia ana e ngā tātari me ngā pūrere iti.

Ko te metadata HDR takoto (HDR10 nga uara whakaaturanga matua, te taumata mārama ihirangi) e mau ana ki te 3GP ina tautokona e ngā kāwai me te pūāhua kōaro i kōwhiria (HEVC, AV1 i MKV / MP4). He nui ake te pōturi o Dolby Vision — ko te tātai DV 5 / 7 / 8.1 i te MP4 e ora noa ana ki te MKV me HEVC; te tahuri ki tētahi 3GP kāwai kāore e mau ana i te apa DV ki te HDR10.

MKV me te WebM e whakataki ana i ngā rārangi wā-whāiti tūturu, ā, ka whakahaeretia e VFR māori, nā reira MP4 VFR e ora ana ki tētahi 3GP o ēnei hanga kāore i te tāurunga. MP4 e pupuri ana hoki i ngā rārangi wā, engari ko ētahi kaitapere e whakaaro ana ki te CFR; Ka whakaaturia e te tahuri tētahi "pūngao CFR" e whakamātau ana i te VFR MP4 ki te 24 / 30 / 60 fps 3GP mō ngā ūnga raruraru.