Teknụzụ vidiyo agbanweela ngwa ngwa n'ime iri afọ ole na ole gara aga. Tupu mgbe ahụ, e ji nnukwu nchịkọta foto ndị na-adịghị arụ ọrụ mee vidiyo, ha jikwa nnukwu faịlụ buru ibu mee ka ha bụrụ dijitalụ. Mana ugbu a, nhazi vidiyo ewetala mgbanwe teknụzụ - ịpịkọta faịlụ ndị a ka ha ghara iri obere ohere. O kwekwara omume ikiri vidiyo na ịntanetị, ma n'oge na n'oge achọrọ.
Otu n'ime teknụzụ koodu kachasị ewu ewu bụ H.264 (AVC – Advanced Video Codeing) nke nwere ike idozi ọtụtụ nsogbu dị mma gbasara mgbasa ozi vidiyo. Na blọgụ nke taa, ka anyị mụta ihe koodu vidiyo H.264 bụ, otu o si arụ ọrụ, na uru ya n'ụzọ zuru ezu.
Kedu ihe bụ H.264/AVC?
A na-akpọkwa H.264 Advanced Video Codeing (AVC) ma ọ bụ MPEG-4 Part 10. Ọ bụ teknụzụ mkpakọ vidiyo nke International Telecommunications Union (dị ka H.264) na International Organization for Standardization/International Electrotechnical Commission Moving Picture Experts Group mepụtara (dị ka MPEG-4 Part 10, Advanced Video Codeing, ma ọ bụ AVC).
Taa, a na-ejikarị koodu H.264 eme ihe na mgbasa ozi vidiyo. Koodu a bụ ọkọlọtọ ụlọ ọrụ maka mkpakọ vidiyo nke na-enyere ndị okike aka idekọ, mpịachi, na kesaa vidiyo ha n'ịntanetị. Ọ na-enye ezigbo mma vidiyo na obere ọnụego bit ma e jiri ya tụnyere ọkọlọtọ gara aga. Ya mere, a na-ejikarị ya eme ihe na mgbasa ozi TV USB na diski Blu-ray.
Dịka koodu vidiyo, a na-emepụta H.264 ugboro ugboro n'ụdị akpa MPEG-4, nke na-eji ndọtị .MP4, yana QuickTime (.MOV), Flash (.F4V), 3GP maka ekwentị mkpanaaka (.3GP), na MPEG transport stream (.ts). Mgbe ụfọdụ, a na-etinye vidiyo H.264 na koodu Advanced Audio Codeing (AAC), ọkọlọtọ ISO/IEC (MPEG4 Part 3).
Kedu ka H.264/AVC si arụ ọrụ?
Ihe ntinye vidiyo H.264 na-eme usoro amụma, mgbanwe, na koodu iji mepụta bitstream H.264 agbakọrọ agbakọ. Ọ na-eji ọkọlọtọ nke na-elekwasị anya na blọk yana asọmpi mmegharị iji hazie okpokolo nke ọdịnaya vidiyo. Ihe a ga-arụpụta ga-abụ macroblocks nke nwere nha blọk dị ka pikselụ 16×16.
Ugbua, onye na-emepụta vidiyo H.264 na-arụ ọrụ ndị ọzọ dịka ịgbanwe, ịgbanwe agbanwe, na imegharị iji mepụta usoro vidiyo e decoded. Ọ na-enweta obere iyi H. 264 a gbakọrọ agbakọ, na-akọwapụta ihe ọ bụla e ji mee syntax, ma na-ewepụta ozi dị ka nhazi mgbanwe quantized, ozi amụma, wdg. Ọzọkwa, a ga-eji ozi a gbanwee usoro koodu ma mepụta usoro onyonyo vidiyo. E gosiri usoro nhazi na nhazi vidiyo H.264 n'okpuru.
Uru nke H.264
1.Ojiji bandwidth dị ala na nlekota mkpebi dị elu - Ọ na-enye nnyefe dị elu nke vidiyo mmegharị zuru oke yana obere ihe achọrọ na obere oge karịaụkpụrụ vidiyo ọdịnaladị ka MPEG-2. H.264 na-eji koodu dị irè nke na-enye onyonyo dị elu ma na-eji obere bandwit.
2.Obere ọnụego bitrate H.264 karịa usoro ndị ọzọ - O nwere obere ọnụego bitrate 80% karịa vidiyo Motion JPEG. A na-eme atụmatụ na nchekwa bitrate nwere ike ịbụ 50% ma ọ bụ karịa ma e jiri ya tụnyere MPEG-2. Dịka ọmụmaatụ, H.264 nwere ike inye mma onyonyo ka mma na otu bitrate a kpọchiri akpọchi. Na obere ọnụego bitrate, ọ na-enye otu mma onyonyo ahụ.
3.Mbelata ọchịchọ maka nchekwa vidiyo - Ọ na-ebelata nha ọdịnaya faịlụ vidiyo dijitalụ site na 50% ma na-eji obere nchekwa iji chekwaa vidiyo ma e jiri ya tụnyere ụkpụrụ ndị ọzọ nke dị mkpa iji nye ohere maka nnyefe vidiyo dị mfe site na IP.
4.Vidiyo dị egwu - Ọ na-enye ọdịnaya vidiyo doro anya ma dị elu na ọnụego data nke ¼, nke bụ ọkara nha nke usoro vidiyo ndị ọzọ.
5.Ka mma - Ọ dị irè okpukpu abụọ karịa, nha faịlụ ahụ pere mpe ugboro atọ karịa codecs MPEG-2 - nke na-eme ka usoro mkpakọ a dịkwuo irè. Koodu a na-eme ka obere bandwidth nnyefe maka ọdịnaya vidiyo dị.
6.Dabara adaba maka ọdịnaya vidiyo nwayọ nwayọ - Ọ dị oke irè maka codecs vidiyo obere ngagharị site na iji igwefoto megapixel.
Oge ozi: Nọvemba-20-2022
