To taub Lossy Video Lossis thiab Lossless
Yeeb yaj duab siv ntau qhov chaw-qhov ntau npaum li cas sib txawv raws li hom ntawv yees duab, qhov kev daws teeb meem thiab tus naj npawb ntawm cov ntu thib ob uas koj xaiv. Uncompressed 1080 HD video footage yuav siv li 10.5 GB ntawm qhov chaw ib feeb ntawm video. Yog hais tias koj siv lub xov tooj tua koj cov yees duab, 1080p cov duab yuav siv li 130 MB ib feeb ntawm cov duab, thaum 4K yees duab yuav siv li 375 MB ntawm qhov chaw rau txhua zaj yeeb yaj kiab. Vim tias nws siv ntau qhov chaw, yuav tsum tau yees duab yees ua ntej nws muab tso rau hauv lub vas sab. "Compressed" tsuas yog txhais tau hais tias cov ntaub ntawv muab ntim rau hauv ib qho chaw me me. Muaj ob hom kev ywj pheej: ploj thiab poob.
Lossy Compression
Lossy compression txhais tau hais tias cov ntaub ntawv compressed muaj tsawg dua cov ntaub ntawv nyob rau hauv nws tshaj li cov thawj cov ntaub ntawv. Qee zaum, qhov no txhais tau tias yuav txo cov ntaub ntawv zoo, vim hais tias cov ntaub ntawv tau raug "poob lawm," li no lub npe. Txawm li cas los xij, koj tuaj yeem plam cov ntaub ntawv tseem ntau ua ntej koj pib pom qhov txawv. Lossy compression ua rau cov poob hauv kev zoo los ntawm ua cov ntaub ntawv me me comparatively. Piv txwv, DVDs tau siv cov qauv MPEG-2 , uas tuaj yeem ua cov ntaub ntawv 15 txog 30 npaug me dua, tab sis cov neeg saib xyuas tseem pheej pom cov DVDs kom muaj duab zoo.
Feem ntau cov yees duab uas muab tso rau hauv internet siv cov lus dag lossis kom tswj cov ntaub ntawv me me thaum xa khoom zoo.
Tsis Ncaj Ncees
Tsis yuam kev nrawm yog raws nraim li nws suab zoo li, compression twg tsis muaj cov ntaub ntawv ploj. Qhov no tsis yog ze li qhov tseem ceeb los ua kom compression vim hais tias cov ntaub ntawv feem ntau mus ua qhov loj tib yam li lawv tau ua ntej compression. Qhov no yuav zoo li pointless, li txo cov ntaub ntawv loj yog lub hom phiaj ntawm kev sib txuam. Txawm li cas los xij, yog tias cov ntaub ntawv me me tsis yog qhov teeb meem, siv qhov tsis ua kom yuam kev los ntawm cov duab zoo meej. Piv txwv, ib qhov video xa tawm cov ntaub ntawv los ntawm ib lub computer mus rau lwm tus siv lub zog tsav tsheb yuav xaiv siv qhov tsis ua kom yuam kev los tiv thaiv zoo thaum nws ua haujlwm.