{"id":85242,"date":"2020-06-14T13:42:23","date_gmt":"2020-06-14T11:42:23","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/kak-my-delali-tanczevalnyj-bal-onlajn"},"modified":"2020-06-14T13:42:23","modified_gmt":"2020-06-14T11:42:23","slug":"kak-my-delali-tanczevalnyj-bal-onlajn","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/administrirovanie\/kak-my-delali-tanczevalnyj-bal-onlajn","title":{"rendered":"Cum am organizat un bal de dans online","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"Cum
\n
\nBalul Mare Ofi\u021beresc din Sevastopol are loc \u00een mod tradi\u021bional \u00een iunie, dar de data aceasta preg\u0103tirile nu au decurs bine. Organizatorii au decis s\u0103 lanseze \u201eBalul din Sevastopol Online\u201d. Deoarece transmitem evenimentul de c\u00e2\u021biva ani \u00eencoace, nu aveam de ales. Spectatorii din Facebook, VK \u0219i YouTube, 35 de perechi danseaz\u0103 acas\u0103.<\/a><\/noindex><\/p>\n

De fapt, dup\u0103 o vreme de c\u00e2nd ne ocup\u0103m cu transmisiunile online, am observat o tendin\u021b\u0103 c\u0103 aproape fiecare proiect necesit\u0103 (sau ne cerem noi) o anumit\u0103 inova\u021bie. Odat\u0103 folosim SDI pentru prima dat\u0103, alt\u0103 dat\u0103 un video sender, sau transmitem semnalul folosind mai multe modemuri 4G de pe mare, un nou mixer, o matrice de semnale, capt\u0103m video de la un drone, restream pe 25 de grupuri VK \u0219i a\u0219a mai departe. Fiecare nou proiect ne for\u021beaz\u0103 s\u0103 ne aprofund\u0103m \u0219i mai mult \u00een lumea stream-urilor. Vorbim despre asta pe YouTube la VidMK, a\u0219a c\u0103 am decis s\u0103 scriem \u0219i pe Habr.<\/p>\n

Deci, sarcina...<\/h2>\n

\nBalul de dans din cauza epidemiei se desf\u0103\u0219oar\u0103 online. Exist\u0103 o pereche principal\u0103, iar ceilal\u021bi participan\u021bi danseaz\u0103 urm\u00e2ndu-i, adic\u0103 trebuie s\u0103 vad\u0103 \u0219i s\u0103 aud\u0103 perechea principal\u0103 \u00eempreun\u0103 cu muzica. <\/p>\n

\"Cum
\n
\nLa \u00eenceput se al\u0103tur\u0103 guvernatorul din Sevastopol pentru a deschide balul. Transmisiunea regizat\u0103 este difuzat\u0103 pe YouTube, Facebook \u0219i VK.<\/p>\n

\"Cum
\n
\nCea mai evident\u0103 op\u021biune a fost s\u0103 ne \u00eent\u00e2lnim cu to\u021bii \u00eentr-un video-chat. Primul care mi-a venit \u00een minte a fost Zoom, dar de obicei \u00eencerc s\u0103 nu m\u0103 apuc imediat de ceea ce este popular, ci caut alternative. Este posibil ca marketing-ul lor s\u0103 fie bun \u0219i chiar dac\u0103 instrumentul este decent, cu siguran\u021b\u0103 exist\u0103 ceva mai bun. \u00cen chat-ul AVstream s-a discutat de c\u00e2teva ori despre TrueConf, a\u0219a c\u0103 am decis s\u0103 \u00eel \u00eencerc.<\/p>\n

Este important de men\u021bionat c\u0103 ne afl\u0103m \u00een Crimeea \u0219i multe servicii populare nu func\u021bioneaz\u0103 aici. Trebuie s\u0103 c\u0103ut\u0103m \u0219i adesea alternativele se dovedesc a fi mai bune. De exemplu, \u00een loc de Trello, care este blocat, am \u00eenceput s\u0103 folosim Planfix, care este foarte performant. <\/p>\n

TrueConf m-a convins imediat prin posibilitatea de a ne ridica propriul server. \u00cen teorie, acest lucru ar \u00eensemna c\u0103 nu suntem afecta\u021bi de cre\u0219terea general\u0103 a \u00eenc\u0103rc\u0103turii asupra centrelor de date \u00een perioada de autoizolare, ne a\u0219ez\u0103m lini\u0219ti\u021bi \u00een Sevastopol, conect\u00e2nd \u00een principal utilizatori locali \u0219i c\u00e2\u021biva din alte ora\u0219e, \u0219i totul func\u021bioneaz\u0103 stabil. \u00cen plus, utilizarea propriei servere a fost mai avantajoas\u0103 din punct de vedere financiar. Iar \u00een cazul clien\u021bilor no\u0219tri, l-au oferit gratuit, deoarece organizatorii balului sunt ONG-uri.<\/p>\n

\u00cen general, am testat produsul \u0219i am \u00een\u021beles c\u0103 ni se potrive\u0219te. De\u0219i nu am realizat o sarcin\u0103 complet\u0103 de 35 de persoane \u00een teste, ne-a fost pu\u021bin fric\u0103 de cum se va comporta un computer mai vechi \u00een rolul de server. Cerin\u021bele sistemului sunt destul de ridicate pentru o astfel de sarcin\u0103, a\u0219a c\u0103 am adus un computer pe baz\u0103 de AMD Ryzen 7 2700, \u0219i cu acesta am fost mai lini\u0219ti\u021bi. <\/p>\n

Serverul s-a aflat fizic acolo unde a avut loc transmisiunea balului. Principala aplica\u021bie pentru videoconferin\u021b\u0103 a fost conectat\u0103 pe aceea\u0219i re\u021bea cu serverul<\/a>. Aceasta ne-a oferit mai mult\u0103 siguran\u021b\u0103 c\u0103 imaginea server<\/a> va ajunge cu siguran\u021b\u0103, iar apoi va fi transmis\u0103 online c\u0103tre ceilal\u021bi participan\u021bi. Apropo, internetul trebuie s\u0103 fie bun. Pentru cei 35 de participan\u021bi ai no\u0219tri, viteza de upload a ajuns la 120 Mbit, adic\u0103 un internet obi\u0219nuit de 100 Mbit nu va fi suficient. \u00cen general, serverul func\u021bioneaz\u0103, s\u0103 ne apuc\u0103m de emisie\u2026<\/p>\n

Semnalul de la camer\u0103<\/h2>\n

\nOrice videoconferin\u021b\u0103 ofer\u0103 op\u021biunea de a alege o camer\u0103 web ca surs\u0103 de imagine \u0219i un microfon pentru sunet. Cum proced\u0103m dac\u0103 trebuie s\u0103 conect\u0103m o camer\u0103 video profesional\u0103 \u0219i sunet de la dou\u0103 microfoane cu acompaniament? Pe scurt, am folosit NDI.<\/p>\n

Tot emisia trebuia s\u0103 fie regizat\u0103 \u0219i transmis\u0103 \u00een re\u021belele sociale. Pentru aceasta, am avut un computer principal \u00een rol de mini-OB (studiou mobil de televiziune). Toat\u0103 munca s-a desf\u0103\u0219urat cu ajutorul programului vMix. Acesta este un software destul de puternic pentru organizarea transmisiilor de diferite tipuri \u0219i niveluri de dificultate. <\/p>\n

\"Cum
\n
\nPerechea noastr\u0103 de dans a fost filmat\u0103 cu o singur\u0103 camer\u0103, nu a fost nevoie de mai mult. Semnalul de la camer\u0103 a fost capturat cu ajutorul unei pl\u0103ci interne BlackMagic Intensity Pro. Din punctul meu de vedere, aceasta este o plac\u0103 relevant\u0103 pentru captarea unui semnal HDMI. Acest semnal trebuia trimis ca webcam \u00een TrueConf. Se putea converti imediat fluxul \u00eentr-o camer\u0103 web cu ajutorul vMix, dar nu am vrut s\u0103 aglomer\u0103m totul pe un singur computer. A\u0219adar, pentru apelul TrueConf am folosit un laptop separat. <\/p>\n

Cum s\u0103 ob\u021bii semnal de la camer\u0103 pe laptop? Po\u021bi crea un semnal video virtual pe un computer \u0219i s\u0103 \u00eel captezi pe orice alt computer din re\u021beaua local\u0103 de c\u00e2te ori dore\u0219ti. Acesta este NDI (Network Device Interface). Practic, un fel de cablu virtual, care nu necesit\u0103 o administrare complicat\u0103. L\u0103\u021bimea de band\u0103 a unui flux pentru 1080p25 este aproape de 100 Mbit, a\u0219adar, pentru o func\u021bionare stabil\u0103 este necesar\u0103 o re\u021bea de 1 Gbit sau un WiFi mai mare de 150 Mbit. Dar este mai bine s\u0103 folose\u0219ti cablu. Pot exista mai multe semnale NDI \u00eentr-o re\u021bea local\u0103, at\u00e2ta timp c\u00e2t l\u0103\u021bimea de band\u0103 este suficient\u0103.<\/p>\n

A\u0219adar, pe computerul principal \u00een vMix vedem semnalul de la camer\u0103, pe care \u00eel trimitem \u00een re\u021bea ca semnal NDI. Pe laptopul de videoconferin\u021b\u0103 capt\u0103m acest semnal folosind programul NDI Virtual Input din pachetul NDI Tools (care este gratuit). Acest mini-program creeaz\u0103 o camer\u0103 web virtual\u0103, \u00een care introduci semnalul NDI dorit. Practic, aceasta este tot, camera noastr\u0103 HDMI a ap\u0103rut \u00een TrueConf prin NDI.<\/p>\n

Ce este cu sunetul?<\/h2>\n

\n\"Cum
\n
\nSunetul de la cele dou\u0103 microfoane wireless \u0219i fundalul audio le adun\u0103m cu ajutorul unei console audio bune \u0219i le introducem \u00een vMix printr-o plac\u0103 de sunet extern\u0103. Aceast\u0103 sum\u0103 audio o trimitem \u00een emisie \u0219i \u00een fluxul nostru NDI pentru TrueConf. Acolo, \u00een loc de microfonul laptopului, alegem NewTek NDI Audio. Acum to\u021bi dansatorii no\u0219tri v\u0103d \u0219i aud \u00een videoconferin\u021b\u0103 imaginea noastr\u0103 frumoas\u0103 \u0219i sunetul de calitate.<\/p>\n

Imaginea emisiunii<\/h2>\n

\n\u00cen TrueConf am ales modul obi\u0219nuit de videoconferin\u021b\u0103, c\u00e2nd to\u021bi se v\u0103d \u00eentre ei. Mai era o variant\u0103 c\u00e2nd noi vedeam pe toat\u0103 lumea, iar ceilal\u021bi vedeau doar gazdele. Aceasta este mai eficient\u0103, dar atunci nu ar mai fi fost efectul de mas\u0103.<\/p>\n

\"Cum
\n
\n\u00cen formatul de videoconferin\u021b\u0103 \u201eto\u021bi se v\u0103d \u00eentre ei\u201d po\u021bi alege orice fereastr\u0103 pe care vrei s\u0103 o faci mai mare. Astfel, participan\u021bii vedeau cuplul gazdelor, iar noi am creat un alt utilizator, de pe contul c\u0103ruia difuzam imaginea \u00een emisie \u0219i ne-am comutat \u00eentre cupluri. Noi f\u0103ceam clic pe cuplul dorit \u0219i le m\u0103rim ecranul, celelalte cupluri erau mici \u00een jos. Uneori, difuzam toate ecranele pentru a ar\u0103ta c\u00e2t de mul\u021bi oameni danseaz\u0103 sincronizat.<\/p>\n

Acum despre sincronizare<\/h2>\n

\nCu siguran\u021b\u0103 te-ai \u00eentrebat despre \u00eent\u00e2rziere. Da, a existat, \u00een jur de 1-2 secunde \u00een ambele direc\u021bii. Aici noi ascult\u0103m muzica, iar sunetul ajunge la participan\u021bi mai t\u00e2rziu; ei danseaz\u0103 pe acest ritm, iar imaginea lor ajunge la noi \u0219i mai t\u00e2rziu. Am decis s\u0103 ignor\u0103m acest aspect \u00een cadrul formatului, iar totu\u0219i, ar\u0103ta grandios \u0219i interesant. <\/p>\n

Pentru a rezolva problema sincroniz\u0103rii pentru spectatori, putem utiliza o \u00eent\u00e2rziere artificial\u0103 a sunetului \u00een transmisia noastr\u0103 pentru re\u021belele sociale. Astfel, spectatorul va vedea participan\u021bii dans\u00e2nd exact \u00een ritmul muzicii. Dar nu este garantat c\u0103 imaginea ajunge tuturor cu aceea\u0219i \u00eent\u00e2rziere. Aceasta este o alt\u0103 complica\u021bie a schemei de transmisie, pe care cu siguran\u021b\u0103 o vom implementa data viitoare. <\/p>\n

Apropo, \u00een pachetul NDI Tools exist\u0103 un alt mic program - Scan Converter. Acesta creeaz\u0103 un semnal NDI, captur\u00e2nd ecranul sau camera web. A\u0219a este foarte simplu s\u0103 organiza\u021bi o transmisie, de exemplu, competi\u021bii de gaming \u00een cadrul unei re\u021bele locale, av\u00e2nd doar aceast\u0103 re\u021bea \u0219i camere web. Nu sunt necesare alte dispozitive.<\/p>\n

\"Cum
\n
\nPentru noi, acesta a fost un alt proiect, unde a fost nevoie s\u0103 test\u0103m \u00een practic\u0103 solu\u021bii noi cu care nu ne-am confruntat p\u00e2n\u0103 acum \u00een transmisiuni live. Voi r\u0103spunde cu pl\u0103cere la toate comentariile voastre, studiez cu aten\u021bie \u0219i interes sugestiile \u0219i recomand\u0103rile, dac\u0103 \u0219ti\u021bi cum ar fi fost mai bine s\u0103 facem. Lumea transmisiunilor este infinit\u0103, multe tehnologii apar sub ochii no\u0219tri, iar \u00eenv\u0103\u021b\u0103m \u00eempreun\u0103 mai repede. Mai jos pute\u021bi viziona un videoclip de prezentare de la loca\u021bie.<\/p>\n

\r\n \"Reda\u021bi\r\n
<\/div>\r\n <\/div><\/center>
\n
Sursa: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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