{"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\/cs\/blog\/administrirovanie\/kak-my-delali-tanczevalnyj-bal-onlajn","title":{"rendered":"Jak jsme d\u011blali online tane\u010dn\u00ed bal","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"Jak
\n
\nVelk\u00fd Sevastopolsk\u00fd d\u016fstojnick\u00fd bal se tradi\u010dn\u011b kon\u00e1 v \u010dervnu, ale tentokr\u00e1t se p\u0159\u00edpravy nevyvedly. Organiz\u00e1to\u0159i se rozhodli uspo\u0159\u00e1dat \"Sevastopolsk\u00fd bal online\". Jeliko\u017e vys\u00edl\u00e1n\u00ed akce d\u011bl\u00e1me u\u017e n\u011bkolik let po sob\u011b, nebylo cesty zp\u011bt. Div\u00e1ci na Facebooku, VKontakte a na YouTube, 35 p\u00e1r\u016f tancuje ve sv\u00fdch domovech.<\/a><\/noindex><\/p>\n

Obecn\u011b, po n\u011bjak\u00e9 dob\u011b zab\u00fdv\u00e1n\u00ed se online vys\u00edl\u00e1n\u00edm, jsme si v\u0161imli trendu, \u017ee t\u00e9m\u011b\u0159 ka\u017ed\u00fd projekt vy\u017eaduje (nebo my od sebe vy\u017eadujeme) n\u011bjak\u00e9 novinky. N\u011bkdy poprv\u00e9 pou\u017e\u00edv\u00e1me SDI, n\u011bkdy videop\u0159ena\u0161e\u010d, n\u011bkdy p\u0159en\u00e1\u0161\u00edme sign\u00e1l pomoc\u00ed n\u011bkolika 4G modem\u016f z mo\u0159e, nov\u00e1 pult, matice sign\u00e1l\u016f, vezmeme video z dronu, restream na 25 skupin VK atd. Ka\u017ed\u00fd nov\u00fd projekt n\u00e1s nut\u00ed pono\u0159it se do sv\u011bta streamov\u00e1n\u00ed je\u0161t\u011b hloub\u011bji. O tom vypr\u00e1v\u00edme na YouTube VidMK, rozhodli jsme se napsat i na Habr.<\/p>\n

Tak\u017ee, \u00fakol...<\/h2>\n

\nTane\u010dn\u00ed bal se kv\u016fli epidemii kon\u00e1 online. Je tu hlavn\u00ed p\u00e1r, ostatn\u00ed \u00fa\u010dastn\u00edci tan\u010d\u00ed tak, \u017ee je napodobuj\u00ed, tak\u017ee mus\u00ed vid\u011bt a sly\u0161et hlavn\u00ed p\u00e1r spolu s hudbou. <\/p>\n

\"Jak
\n
\nNa za\u010d\u00e1tku se p\u0159ipoj\u00ed guvern\u00e9r Sevastopolu, aby otev\u0159el bal. Hotov\u00e9 re\u017eis\u00e9rsk\u00e9 vys\u00edl\u00e1n\u00ed prob\u00edh\u00e1 na YouTube, Facebooku a VK.<\/p>\n

\"Jak
\n
\nNejjednodu\u0161\u0161\u00ed zp\u016fsob byl \u2014 zavolat v\u0161em na videohovoru. Prvn\u00edm se mi vybavil Zoom, ale obvykle se sna\u017e\u00edm hned nes\u00e1hnout po n\u011b\u010dem, co je v pov\u011bdom\u00ed, a hled\u00e1m alternativy. Mo\u017en\u00e1 maj\u00ed skv\u011bl\u00fd marketing, a i kdy\u017e je n\u00e1stroj dobr\u00fd, ur\u010dit\u011b existuje n\u011bco jin\u00e9ho. Na chatu AVstream jsme n\u011bkolikr\u00e1t mluvili o TrueConf, rozhodl jsem se to zkusit.<\/p>\n

Tady je d\u016fle\u017eit\u00e9 \u0159\u00edct, \u017ee jsme na Krymu a mnoho popul\u00e1rn\u00edch slu\u017eeb zde nefunguje. Mus\u00edme hledat, a \u010dasto se alternativy uk\u00e1\u017eou jako lep\u0161\u00ed. Nap\u0159\u00edklad m\u00edsto zablokovan\u00e9ho Trello jsme za\u010dali pou\u017e\u00edvat siln\u00fd Planfix. <\/p>\n

TrueConf m\u011b okam\u017eit\u011b zaujal mo\u017enost\u00ed postavit si vlastn\u00ed server. V teorii to znamenalo, \u017ee nejsme z\u00e1visl\u00ed na obecn\u00e9m zv\u00fd\u0161en\u00e9m zat\u00ed\u017een\u00ed datov\u00fdch center b\u011bhem doby izolace, sed\u00edme v klidu v Sevastopolu, p\u0159ipojujeme p\u0159ev\u00e1\u017en\u011b m\u00edstn\u00ed u\u017eivatele a n\u011bkolik z jin\u00fdch m\u011bst, a v\u0161echno funguje stabiln\u011b. Krom\u011b toho bylo vyu\u017e\u00edv\u00e1n\u00ed vlastn\u00edho serveru v\u00fdhodn\u011bj\u0161\u00ed z hlediska n\u00e1klad\u016f. A v p\u0159\u00edpad\u011b na\u0161ich klient\u016f ho nab\u00edzeli dokonce zdarma, proto\u017ee organiz\u00e1to\u0159i plesu jsou NNO.<\/p>\n

Celkov\u011b jsme produkt otestovali a zjistili, \u017ee n\u00e1m vyhovuje. I kdy\u017e jsme p\u0159i testech nezat\u011b\u017eovali syst\u00e9m plnou kapacitou 35 lid\u00ed, m\u011bli jsme trochu obavy, jak se osv\u011bd\u010d\u00ed star\u0161\u00ed po\u010d\u00edta\u010d jako server. Po\u017eadavky na syst\u00e9m jsou p\u0159i takov\u00e9m zat\u00ed\u017een\u00ed docela vysok\u00e9, a proto jsme p\u0159inesli po\u010d\u00edta\u010d s AMD Ryzen 7 2700, co\u017e n\u00e1m dodalo klid. <\/p>\n

Server fyzicky s\u00eddlil tam, kde prob\u00edhala vys\u00edl\u00e1n\u00ed plesu. Hlavn\u00ed aplikaci pro videohovory jsme p\u0159ipojili ve stejn\u00e9 s\u00edti s serverem<\/a>. To dod\u00e1valo jistotu, \u017ee obraz k serveru<\/a> ur\u010dit\u011b doraz\u00ed, a teprve pot\u00e9 p\u016fjde online k ostatn\u00edm \u00fa\u010dastn\u00edk\u016fm. Mimochodem, internet mus\u00ed b\u00fdt kvalitn\u00ed. Pro na\u0161ich 35 \u00fa\u010dastn\u00edk\u016f jsme dos\u00e1hli rychlosti uploadu 120 Mbit, co\u017e znamen\u00e1, \u017ee b\u011b\u017en\u00e9 internetov\u00e9 p\u0159ipojen\u00ed 100 Mbit nebude dostate\u010dn\u00e9. Celkov\u011b server funguje, jdeme se v\u011bnovat vys\u00edl\u00e1n\u00ed\u2026<\/p>\n

Sign\u00e1l z kamery<\/h2>\n

\nJak\u00fdkoliv videohovor nab\u00edz\u00ed mo\u017enost zvolit webovou kameru jako zdroj obrazu a mikrofon pro zvuk. Co d\u011blat, kdy\u017e pot\u0159ebujeme p\u0159ipojit profesion\u00e1ln\u00ed videokameru a zvuk ze dvou mikrofon\u016f se zvukovou stopou? Ve zkratce, pou\u017e\u00edvali jsme NDI.<\/p>\n

Cel\u00e9 vys\u00edl\u00e1n\u00ed jsme museli re\u017eirovat a streamovat na soci\u00e1ln\u00ed s\u00edt\u011b. K tomu jsme m\u011bli hlavn\u00ed po\u010d\u00edta\u010d jako mini-OB (pohybliv\u00e9 televizn\u00ed studio). Cel\u00e1 pr\u00e1ce prob\u00edhala pomoc\u00ed programu vMix. Je to pom\u011brn\u011b v\u00fdkonn\u00fd software pro organizaci r\u016fzn\u00fdch typ\u016f a \u00farovn\u00ed slo\u017eitosti vys\u00edl\u00e1n\u00ed. <\/p>\n

\"Jak
\n
\nNa\u0161i tane\u010dn\u00ed dvojici sn\u00edmala jedna kamera, v\u00edce nebylo pot\u0159eba. Sign\u00e1l z kamery jsme zachytili pomoc\u00ed intern\u00ed karty BlackMagic Intensity Pro. Podle m\u00e9ho n\u00e1zoru je to aktu\u00e1ln\u00ed karta pro zachycen\u00ed jednoho HDMI sign\u00e1lu. Tento sign\u00e1l bylo t\u0159eba poslat jako webovou kameru do TrueConf. Mohli bychom okam\u017eit\u011b konvertovat stream na webovou kameru pomoc\u00ed vMix, ale necht\u011bli jsme shroma\u017e\u010fovat v\u0161echno na jednom po\u010d\u00edta\u010di. Proto jsme pro hovor v TrueConf pou\u017eili samostatn\u00fd notebook. <\/p>\n

Jak z\u00edskat sign\u00e1l z kamery na notebooku? M\u016f\u017eete vytvo\u0159it virtu\u00e1ln\u00ed video sign\u00e1l na jednom po\u010d\u00edta\u010di a zachytit ho na jak\u00e9mkoli jin\u00e9m po\u010d\u00edta\u010di v m\u00edstn\u00ed s\u00edti tolikr\u00e1t, kolikr\u00e1t chcete. To je NDI (Network Device Interface). V podstat\u011b jde o jak\u00fdsi virtu\u00e1ln\u00ed kabel, kter\u00fd nen\u00ed pot\u0159eba nijak zvl\u00e1\u0161\u0165 slo\u017eit\u011b spravovat. \u0160\u00ed\u0159ka jednoho streamu pro 1080p25 je t\u00e9m\u011b\u0159 100 Mbit, tak\u017ee pro stabiln\u00ed provoz je nezbytn\u00e1 s\u00ed\u0165 1 Gbit nebo Wi-Fi s rychlost\u00ed nad 150 Mbit. Ale nejl\u00e9pe je to p\u0159ipojen\u00e9 kabelem. Takov\u00fdch NDI sign\u00e1l\u016f m\u016f\u017ee b\u00fdt v jedn\u00e9 m\u00edstn\u00ed s\u00edti mnoho, jen aby byla dostate\u010dn\u00e1 \u0161\u00ed\u0159ka kan\u00e1lu.<\/p>\n

Na hlavn\u00edm po\u010d\u00edta\u010di v vMix vid\u00edme sign\u00e1l z kamery a pos\u00edl\u00e1me ho do s\u00edt\u011b jako NDI sign\u00e1l. Na notebooku zachyt\u00e1v\u00e1me tento sign\u00e1l pomoc\u00ed programu NDI Virtual Input z bal\u00ed\u010dku NDI Tools (ten je zdarma). Tato mini-program v\u00e1m vytvo\u0159\u00ed virtu\u00e1ln\u00ed webkameru, do kter\u00e9 p\u0159ipojujete pot\u0159ebn\u00fd NDI sign\u00e1l. V podstat\u011b v\u0161e, na\u0161e HDMI kamera se prost\u0159ednictv\u00edm NDI objevila v TrueConf.<\/p>\n

Jak je to se zvukem?<\/h2>\n

\n\"Jak
\n
\nZvuk z dvou radiomikrofon\u016f a hudebn\u00ed podkl\u00e1dku shroma\u017e\u010fujeme pomoc\u00ed dobr\u00e9ho audio mix\u00e1\u017en\u00edho pultu a p\u0159iv\u00e1d\u00edme extern\u00ed zvukovou kartu do vMix. Tento mix zvuku pos\u00edl\u00e1me do vys\u00edl\u00e1n\u00ed a do na\u0161eho NDI streamu pro TrueConf. Tam m\u00edsto mikrofonu notebooku vyb\u00edr\u00e1me NewTek NDI Audio. Te\u010f v\u0161ichni na\u0161i tane\u010dn\u00edci vid\u00ed a sly\u0161\u00ed v videokonferenci na\u0161i kr\u00e1snou obrazovku a kvalitn\u00ed zvuk.<\/p>\n

Vys\u00edlac\u00ed obr\u00e1zek<\/h2>\n

\nVe TrueConf jsme vybrali b\u011b\u017en\u00fd re\u017eim videokonference, kdy v\u0161ichni vid\u00ed v\u0161echny. Existovala i varianta, kdy jsme vid\u011bli v\u0161echny a v\u0161ichni vid\u011bli pouze moder\u00e1tory. To je efektivn\u011bj\u0161\u00ed, ale nem\u011bli bychom takov\u00fd pocit masovosti.<\/p>\n

\"Jak
\n
\nV re\u017eimu videokonference \u201ev\u0161ichni vid\u00ed v\u0161echny\u201c si m\u016f\u017eete vybrat jak\u00e9koli okno, kter\u00e9 byste cht\u011bli zv\u011bt\u0161it. Tak \u00fa\u010dastn\u00edci vid\u011bli moderuj\u00edc\u00ed p\u00e1r a vytvo\u0159ili jsme dal\u0161\u00edho u\u017eivatele, jeho\u017e \u00fa\u010dtu jsme p\u0159en\u00e1\u0161eli obraz do vys\u00edl\u00e1n\u00ed a p\u0159ep\u00ednali mezi p\u00e1ry. Klikali jsme na pot\u0159ebn\u00fd p\u00e1r a zv\u011bt\u0161ovali jejich obrazovku, ostatn\u00ed p\u00e1ry byly mal\u00e9 dole. N\u011bkdy jsme zobrazovali v\u0161echny obrazovky, abychom uk\u00e1zali, kolik lid\u00ed tan\u010d\u00ed synchronn\u011b.<\/p>\n

Nyn\u00ed k synchronizaci<\/h2>\n

\nUr\u010dit\u011b jste se ptali na zpo\u017ed\u011bn\u00ed. Ano, to tu bylo, asi 1-2 sekundy ob\u011bma sm\u011bry. Zde hraje hudba, zvuk k \u00fa\u010dastn\u00edk\u016fm p\u0159ich\u00e1z\u00ed pozd\u011bji, tan\u010d\u00ed podle tohoto rytmu, a jejich obraz se k n\u00e1m vrac\u00ed je\u0161t\u011b pozd\u011bji. Rozhodli jsme se ve form\u00e1tu toto zpo\u017ed\u011bn\u00ed ignorovat a i tak to vypadalo velkolep\u011b a zaj\u00edmav\u011b. <\/p>\n

Vy\u0159e\u0161en\u00ed ot\u00e1zky synchronizace pro div\u00e1ky lze dos\u00e1hnout um\u011bl\u00fdm zpo\u017ed\u011bn\u00edm zvuku v na\u0161em vys\u00edl\u00e1n\u00ed pro soci\u00e1ln\u00ed s\u00edt\u011b. T\u00edm by div\u00e1k streamu vid\u011bl, jak \u00fa\u010dastn\u00edci tancuj\u00ed p\u0159esn\u011b v rytmu hudby. Ale nen\u00ed zaru\u010deno, \u017ee obraz od v\u0161ech p\u0159ich\u00e1z\u00ed se stejn\u00fdm zpo\u017ed\u011bn\u00edm. To op\u011bt zkomplikuje sch\u00e9ma vys\u00edl\u00e1n\u00ed, v p\u0159\u00ed\u0161t\u00edm p\u0159\u00edpad\u011b to ur\u010dit\u011b ud\u011bl\u00e1me takto. <\/p>\n

Mimochodem, v bal\u00ed\u010dku NDI Tools je tak\u00e9 dal\u0161\u00ed mini-program \u2014 Scan Converter. Ten vytv\u00e1\u0159\u00ed NDI sign\u00e1l zachycen\u00edm va\u0161\u00ed obrazovky nebo webkamery. Takto snadno m\u016f\u017eete zorganizovat vys\u00edl\u00e1n\u00ed, nap\u0159\u00edklad kybernetick\u00e9 sout\u011b\u017ee uvnit\u0159 lok\u00e1ln\u00ed s\u00edt\u011b, pokud m\u00e1te pouze tuto s\u00ed\u0165 a webov\u00e9 kamery. \u017d\u00e1dn\u00e9 dal\u0161\u00ed za\u0159\u00edzen\u00ed nen\u00ed pot\u0159eba.<\/p>\n

\"Jak
\n
\nPro n\u00e1s to byl dal\u0161\u00ed projekt, kde jsme museli otestovat nov\u00e1 \u0159e\u0161en\u00ed, se kter\u00fdmi jsme se je\u0161t\u011b nesetkali v bojov\u00fdch streamech. R\u00e1d odpov\u00edm na v\u0161echny va\u0161e koment\u00e1\u0159e, pozorn\u011b a se z\u00e1jmem prostuduji p\u0159\u00e1n\u00ed a doporu\u010den\u00ed, pokud v\u00edte, jak bylo mo\u017en\u00e9 ud\u011blat l\u00e9pe. Sv\u011bt stream\u016f je nekone\u010dn\u00fd, mnoho technologi\u00ed se objevuje p\u0159ed na\u0161imi o\u010dima a u\u010dit se spolu jde rychleji. N\u00ed\u017ee si m\u016f\u017eete prohl\u00e9dnout p\u0159ehledov\u00e9 video z m\u00edsta.<\/p>\n

\r\n \"P\u0159ehr\u00e1t\r\n
<\/div>\r\n <\/div><\/center>
\n
Zdroj: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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