Teknụzụ vidiyo emeela mgbanwe ngwa ngwa n'ime afọ iri abụọ gara aga.Tupu mgbe ahụ, a na-eji nnukwu foto ndị a ka dị iche iche mee vidiyo, ha na-ejikwa faịlụ buru ibu buru ibu mee ka ha bụrụ dijitalụ.Mana ugbu a, ntinye vidiyo ewetala mgbanwe teknụzụ - ịpịkọta faịlụ ndị a iji rie obere ohere.O nwekwaara ike ịkwanye vidiyo n'Internet, ma ozugbo ma mgbe achọrọ ya.
Otu n'ime teknụzụ ntinye koodu kachasị ewu ewu bụ H.264 (AVC - Advanced Video Coding) nke nwere ike dozie ọtụtụ okwu dị mma gbasara mgbasa ozi vidiyo.Na blọọgụ nke taa, ka anyị mụta ihe ntinye vidiyo H.264, ka o si arụ ọrụ, yana uru ya n'ụzọ zuru ezu.
Kedu ihe bụ H.264/AVC?
A na-akpọkwa H.264 Advanced Video Coding (AVC) ma ọ bụ MPEG-4 Nkebi 10. Ọ bụ teknụzụ mkpakọ vidiyo jikọtara ọnụ nke International Telecommunications Union (dị ka H.264) na International Organisation for Standardization/International Electrotechnical Commission Moving Picture Ndị ọkachamara Group (dị ka MPEG-4 Part 10, Advanced Video nzuzo, ma ọ bụ AVC).
N'oge a, H.264 codec na-ejikarị eme ihe na nkwanye vidiyo.Codec a bụ ọkọlọtọ ụlọ ọrụ maka mkpakọ vidiyo na-enyere ndị okike aka ịdekọ, mpikota onu ma kesaa vidiyo ha n'ịntanetị.Ọ na-anapụta àgwà vidiyo dị mma na obere bitrates tụnyere ụkpụrụ ndị gara aga.N'ihi ya, a na-eji ya na mgbasa ozi USB TV na diski Blu-ray.
Dị ka a video codec, H.264 na-emekarị na-emepụta na MPEG-4 akpa format, nke na-eji .MP4 ndọtị, nakwa dị ka QuickTime (.MOV), Flash (.F4V), 3GP maka mobile phones (.3GP), na iyi ụgbọ njem MPEG (.ts).Mgbe ụfọdụ, ihe H.264 video na-encoded na audio abịakọrọ na Advanced Audio Coding (AAC) codec, ihe ISO/IEC ọkọlọtọ (MPEG4 Part 3).
Kedu ka H.264/AVC si arụ ọrụ?
Ihe mkpuchi vidiyo H.264 na-arụ amụma, mgbanwe, na usoro ntinye iji mepụta H.264 bitstream abịakọrọ.Ọ na-eji ọkọlọtọ gbadoro ụkwụ na ngọngọ nwere asọmpi ngagharị iji hazie okpokolo agba nke ọdịnaya vidiyo.Nsonaazụ a ga-abụ macroblocks nke nwere nha mgbochi buru ibu dịka 16 × 16 pikselụ.
Ugbu a, ihe ngbanwe vidiyo H.264 na-arụ usoro mmekọ dị ka ngbanwe, mgbanwe mgbanwe, na nrụzigharị iji mepụta usoro vidiyo decoded.Ọ na-enweta mpikota onu H. 264 bitstream, decodes nke ọ bụla syntax element, na-ewepụta ozi dị ka quantized transform coecients, amụma amụma, wdg. Ọzọkwa, a ga-eji ozi a tụgharịa na nzuzo usoro na megharịa a usoro nke video oyiyi.E gosipụtara usoro ntinye vidiyo na ntinye koodu H.264 n'okpuru.
Uru nke H.264
1.Ojiji bandwidth dị ala na nleba anya mkpebi dị elu - Ọ na-enye mgbasa ozi dị elu nke vidiyo ngagharị zuru oke yana chọrọ bandwidth dị ala na obere latency karịa.ụkpụrụ vidiyo ọdịnaladị ka MPEG-2.H.264 na-eji codec na-arụ ọrụ nke ọma na-enye ihe oyiyi dị elu ma na-eji obere bandwidth.
2.Lower H.264 bitrate karịa usoro ndị ọzọ - Ọ nwere 80% obere bitrate karịa vidiyo Motion JPEG.A na-eme atụmatụ na nchekwa ego bitrate nwere ike ịbụ 50% ma ọ bụ karịa ma e jiri ya tụnyere MPEG-2.Ọmụmaatụ, H.264 nwere ike inye mma oyiyi mma na otu abịakọrọ bitrate.Na obere bitrate, ọ na-enye otu àgwà oyiyi ahụ.
3.Mbelata ọchịchọ maka nchekwa vidiyo - Ọ na-ebelata nha ọdịnaya faịlụ vidiyo dijitalụ site na 50% ma na-eji obere nchekwa chekwaa vidiyo ma e jiri ya tụnyere ụkpụrụ ndị ọzọ na-egosi na ọ dị mkpa iji kwe ka nnyefe vidiyo dị mfe site na IP.
4.Ogo vidiyo na-enweghị atụ- Ọ na-ewepụta ọdịnaya vidiyo doro anya, dị elu na ọnụego data nke ¼, nke bụ ọkara nha nke usoro vidiyo ọzọ.
5.More ịrụ ọrụ nke ọma - Ọ bụ ugboro abụọ ọzọ nke ọma, na faịlụ size bụ 3X ugboro obere karịa MPEG-2 codecs - na-eme ka nke a mkpakọ format ọzọ nke ọma.Codec a na-ebute obere bandwidth nnyefe maka ọdịnaya vidiyo.
6.Kwesịrị ekwesị maka ọdịnaya vidiyo na-eme ngwa ngwa- Ọ na-arụ ọrụ nke ọma maka codecs vidiyo dị ala na-eji igwefoto megapixel.
Oge nzipu: Nov-20-2022