{"id":782,"date":"2008-01-18T07:26:23","date_gmt":"2008-01-18T06:26:23","guid":{"rendered":"http:\/\/novysmer.cz\/index.php\/2008\/01\/18\/prakticke-zkuenosti-s-pijmem-rhf-tv\/"},"modified":"2008-01-18T07:26:23","modified_gmt":"2008-01-18T06:26:23","slug":"prakticke-zkuenosti-s-pijmem-rhf-tv","status":"publish","type":"post","link":"http:\/\/novysmer.cz\/index.php\/2008\/01\/18\/prakticke-zkuenosti-s-pijmem-rhf-tv\/","title":{"rendered":"Praktick\u00e9 zku\u0161enosti s p\u0159\u00edjmem RHF TV"},"content":{"rendered":"<p> <img loading=\"lazy\" class=\" alignleft size-full wp-image-3\" src=\"http:\/\/novysmer.cz\/wp-content\/uploads\/2007\/10\/logo.jpg\" border=\"0\" alt=\"logo\" title=\"logo\" hspace=\"5\" vspace=\"5\" width=\"100\" height=\"65\" align=\"left\" \/><strong> Na internetov\u00e9 zku\u0161ebn\u00ed vys\u00edl\u00e1n\u00ed RHF TV (http:\/\/82.208.50.159\/futuratv) jsem narazil \u010dirou n\u00e1hodou 2. ledna 2008. V t\u00e9 dob\u011b se tam prot\u00e1\u010dely nonstop t\u0159i filmy (Zlod\u011bji kol, Mefisto, Pavouk). V\u0161echny tyto filmy byly vys\u00edl\u00e1ny v rozli\u0161en\u00ed 640 x 480 datov\u00fdm tokem 244 kb\/s (Zlod\u011bji kol, Pavouk), resp. 278 kb\/s (Mefisto). Pro tak vysok\u00e9 rozli\u0161en\u00ed byl pou\u017eit\u00fd datov\u00fd tok (stream) p\u0159\u00edli\u0161 n\u00edzk\u00fd, tak\u017ee se obraz viditeln\u011b &quot;sekal&quot; (zvuk byl bez probl\u00e9mu).<\/strong>  <\/p>\n<p> &nbsp; <\/p>\n<p> <!--more--> <\/p>\n<p> V dal\u0161\u00ed f\u00e1zi experimentu (kolem 4. ledna) byly do vys\u00edl\u00e1n\u00ed postupn\u011b za\u0159azeny filmy v rozli\u0161en\u00ed 320 x 240, odbavovan\u00e9 datov\u00fdm tokem 224 kb\/s (Sc\u00e9ny z man\u017eelsk\u00e9ho \u017eivota, \u0160epoty a v\u00fdk\u0159iky, Toulav\u00fd pes, Kr\u00e1l Kr\u00e1l\u016f). Ni\u017e\u0161\u00ed rozli\u0161en\u00ed se pozitivn\u011b prom\u00edtlo do plynulosti obrazu (&quot;sek\u00e1n\u00ed&quot; obrazu se vyskytovalo jen v\u00fdjime\u010dn\u011b). Obraz v t\u00e9to kvalit\u011b je mo\u017en\u00e9 bez v\u011bt\u0161\u00edch probl\u00e9m\u016f sledovat i ve zv\u011bt\u0161en\u00ed 200 % a z v\u011bt\u0161\u00ed vzd\u00e1lnosti i v celoobrazovkov\u00e9m re\u017eimu 1024 x 768.     <\/p>\n<p> Experiment pokra\u010doval (kolem 6. ledna), kdy byly do nonstop vys\u00edl\u00e1n\u00ed za\u0159azeny filmy v rozli\u0161en\u00ed 320 x 240, ale odbavovan\u00e9 datov\u00fdm tokem 1328 kb\/s (prvn\u00ed dva d\u00edly z 30 p\u0159\u00edpad\u016f majora Zemana, V\u010delka M\u00e1ja &#8211; M\u00e1ja a svatoj\u00e1nek Jakoubek). Zde se uk\u00e1zalo, \u017ee ani zv\u00fd\u0161en\u00ed datov\u00e9ho toku neodstran\u00ed zcela &quot;sek\u00e1n\u00ed&quot; obrazu, zejm\u00e9na na nejlevn\u011bj\u0161\u00edm ADSL 2048 kb\/s. Tady se nejsp\u00ed\u0161 projevuje vliv (ne)kvality p\u0159ipojen\u00ed (re\u00e1ln\u00e1 rychlost je kolem 1600 kb\/s, ale u\u017e jsem nam\u011b\u0159il i hodnoty pod 1000 kb\/s). Tak\u00e9 hodnota web odezvy (webping) je nevaln\u00e1, pohybuje se nad 80 ms (standard kolem 100 ms, ale ob\u010das i nad 200 ms). Na zasek\u00e1v\u00e1n\u00ed m\u016f\u017ee m\u00edt vliv i re\u017eim ADSL FAST (chybn\u00e9 pakety se neopravuj\u00ed). Nav\u00edc tento rychl\u00fd stream notn\u011b ukusuje z limitu FUP (10 GB\/m\u011bs\u00edc).    V z\u00e1v\u011bre\u010dn\u00e9m obdob\u00ed prvn\u00ed etapy zku\u0161ebn\u00edho vys\u00edl\u00e1n\u00ed byly postupn\u011b dopln\u011bny filmy v rozli\u0161en\u00ed 320 x 240, odbavovan\u00e9 datov\u00fdm tokem 264 kb\/s (Princezna se zlatou hv\u011bzdou, Nev\u011b\u0159te mu\u017e\u016fm, Revoluce, Zem\u011b hojnosti, Good Bye Lenin!). Tato konfigurace se mi jev\u00ed jako optim\u00e1ln\u00ed pro dal\u0161\u00ed vys\u00edl\u00e1n\u00ed.  <br \/> Ob\u010dasn\u00e1 nesynchronnost obrazu a zvuku (jako p\u0159i nekvalitn\u00edm dabingu) jde nejsp\u00ed\u0161 na vrub toho, \u017ee obraz je vys\u00edl\u00e1n ve form\u00e1tu WMV a zvuk odd\u011blen\u011b ve form\u00e1tu WMA.  P\u0159\u00edjem byl realizov\u00e1n ve dvou r\u016fzn\u00fdch lokalit\u00e1ch na za\u0159\u00edzen\u00ed n\u00edzk\u00e9 (bazarov\u00e9) technick\u00e9 \u00farovn\u011b.  V prvn\u00edm p\u0159\u00edpad\u011b se jednalo o desktop s procesorem 4OO MHz, pam\u011b\u0165 128 MB, opera\u010dn\u00ed syst\u00e9m Windows 2000 Professional, p\u0159ehr\u00e1va\u010d Windows Media Player 9, internetov\u00e9 p\u0159ipojen\u00ed 10240\/10240 kb\/s (metropolitn\u00ed s\u00ed\u0165 optika\/ethernet).  Ve druh\u00e9m p\u0159\u00edpad\u011b se jednalo o notebook s procesorem 800 MHz, pam\u011b\u0165 128 MB, opera\u010dn\u00ed syst\u00e9m Windows Millenium Edition, p\u0159ehr\u00e1va\u010d Windows Media Player 9, internetov\u00e9 p\u0159ipojen\u00ed ADSL Telef\u00f3nica O2 2048\/128 kb\/s.  Dosahovan\u00e9 v\u00fdsledky, zejm\u00e9na co se plynulosti obrazu t\u00fd\u010de, byly obdobn\u00e9, ale na pomalej\u0161\u00edm ADSL p\u0159ece jen viditeln\u011b hor\u0161\u00ed. Prvn\u00ed etapa experimentu byla ukon\u010dena 16. ledna 2008 odpoledne po odvys\u00edl\u00e1n\u00ed filmu  Good Bye Lenin! Od t\u00e9 doby je vys\u00edl\u00e1n zku\u0161ebn\u00ed obrazec (monoskop) v rozli\u0161en\u00ed 640 x 480 datov\u00fdm tokem 93 kb\/s (stav v dob\u011b psan\u00ed tohoto p\u0159\u00edsp\u011bvku &#8211; 17.1.2008, 22:30).  <\/p>\n<p> &nbsp; <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Na internetov\u00e9 zku\u0161ebn\u00ed vys\u00edl\u00e1n\u00ed RHF TV (http:\/\/82.208.50.159\/futuratv) jsem narazil \u010dirou n\u00e1hodou 2. ledna 2008. V t\u00e9 dob\u011b se tam prot\u00e1\u010dely<\/p>\n","protected":false},"author":1,"featured_media":3,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0},"categories":[6],"tags":[],"_links":{"self":[{"href":"http:\/\/novysmer.cz\/index.php\/wp-json\/wp\/v2\/posts\/782"}],"collection":[{"href":"http:\/\/novysmer.cz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/novysmer.cz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/novysmer.cz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/novysmer.cz\/index.php\/wp-json\/wp\/v2\/comments?post=782"}],"version-history":[{"count":0,"href":"http:\/\/novysmer.cz\/index.php\/wp-json\/wp\/v2\/posts\/782\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/novysmer.cz\/index.php\/wp-json\/wp\/v2\/media\/3"}],"wp:attachment":[{"href":"http:\/\/novysmer.cz\/index.php\/wp-json\/wp\/v2\/media?parent=782"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/novysmer.cz\/index.php\/wp-json\/wp\/v2\/categories?post=782"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/novysmer.cz\/index.php\/wp-json\/wp\/v2\/tags?post=782"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}