{"id":115540,"date":"2024-05-04T19:52:06","date_gmt":"2024-05-04T17:52:06","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/osnovatel-qemu-i-ffmpeg-opublikoval-zvukovoj-kodek-tsac"},"modified":"2024-05-04T19:52:06","modified_gmt":"2024-05-04T17:52:06","slug":"osnovatel-qemu-i-ffmpeg-opublikoval-zvukovoj-kodek-tsac","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/osnovatel-qemu-i-ffmpeg-opublikoval-zvukovoj-kodek-tsac","title":{"rendered":"Zakladatel QEMU a FFmpeg publikoval zvukov\u00fd kodek TSAC","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Francouzsk\u00fd matematik Fabrice Bellard, zakladatel projekt\u016f QEMU, FFmpeg, BPG, QuickJS, TinyGL a TinyCC, publikoval form\u00e1t pro k\u00f3dov\u00e1n\u00ed zvuku TSAC a souvisej\u00edc\u00ed n\u00e1stroje pro kompresi a dekompresi zvukov\u00fdch soubor\u016f. Tento form\u00e1t je zam\u011b\u0159en na p\u0159enos dat s velmi n\u00edzk\u00fdm bitratem, nap\u0159\u00edklad 5,5 kb\/s pro mono a 7,5 kb\/s pro stereo, p\u0159i zachov\u00e1n\u00ed p\u0159ijateln\u00e9 kvality hudby a \u0159e\u010di. Pou\u017eit\u00ed TSAC umo\u017e\u0148uje zabalit hudebn\u00ed skladbu o d\u00e9lce 3,5 minuty a vzorkovac\u00ed frekvenci 44,1 kHz (stereo) do souboru o velikosti 192 KB, kter\u00fd bude pro nen\u00e1ro\u010dn\u00e9ho poslucha\u010de t\u00e9m\u011b\u0159 nerozeznateln\u00fd od origin\u00e1lu. K\u00f3d projektu je distribuov\u00e1n pod licenc\u00ed MIT. <\/p>\n

P\u0159i vytv\u00e1\u0159en\u00ed TSAC byl pou\u017eit zvukov\u00fd kodek Descript, kter\u00fd byl roz\u0161\u00ed\u0159en pro podporu stereozvuku a p\u0159eveden na pou\u017eit\u00ed jin\u00e9 modelu strojov\u00e9ho u\u010den\u00ed zalo\u017een\u00e9ho na neuronov\u00e9 s\u00edti s architekturou 'transformer'. To umo\u017enilo zv\u00fd\u0161it m\u00edru komprese d\u00edky rekonstrukci ztracen\u00fdch detail\u016f s ohledem na model lidsk\u00e9ho sluchov\u00e9ho vn\u00edm\u00e1n\u00ed. Model zab\u00edr\u00e1 p\u0159ibli\u017en\u011b 200 MB ve zkomprimovan\u00e9 podob\u011b a je prezentov\u00e1n v deterministick\u00e9m form\u00e1tu, kter\u00fd zaru\u010duje z\u00edsk\u00e1n\u00ed stejn\u00e9ho v\u00fdsledku bez ohledu na pou\u017eit\u00e9 CPU\/GPU a po\u010det vl\u00e1ken zapojen\u00fdch do v\u00fdpo\u010dt\u016f. <\/p>\n

K\u00f3dova\u010d m\u016f\u017ee pracovat pouze s CPU (pro zrychlen\u00ed jsou podporov\u00e1ny instrukce AVX2), ale pro dosa\u017een\u00ed vysok\u00e9ho v\u00fdkonu je doporu\u010deno vyu\u017e\u00edt GPU. V aktu\u00e1ln\u00edm proveden\u00ed lze vyu\u017e\u00edt API CUDA pro zrychlen\u00ed pomoc\u00ed GPU NVIDIA zalo\u017een\u00fdch na mikroarchitektur\u00e1ch Ampere, ADA a Hopper (RTX 3090, RTX 4090, RTX A6000, A100 a H100), kter\u00e9 maj\u00ed alespo\u0148 4 GB video pam\u011bti. Pro p\u0159evod zvukov\u00fdch soubor\u016f p\u0159ed k\u00f3dov\u00e1n\u00edm se pou\u017e\u00edv\u00e1 FFmpeg.

origin\u00e1ln\u00edstereo 6.21 kb\/smono 4.71 kb\/sstereo 2.57 kb\/s<\/center> <\/p>\n

D\u00e1le lze zm\u00ednit aktualizaci n\u00e1stroje ts_zip, vyvinut\u00e9ho Bellarem, kter\u00fd je ur\u010den pro efektivn\u00ed kompresi textov\u00fdch dat s vyu\u017eit\u00edm mechanismu predikce token\u016f zalo\u017een\u00e9ho na syst\u00e9mu strojov\u00e9ho u\u010den\u00ed a velk\u00e9m jazykov\u00e9m modelu RWKV 169M v4. P\u0159i kompresi archivu Wikipedie umo\u017enil n\u00e1stroj ts_zip zmen\u0161it data na 7,3n\u00e1sobek, zat\u00edmco p\u0159i kompresi j\u00e1dra Linuxu 1.2 - na 7,8n\u00e1sobek. Pro srovn\u00e1n\u00ed \u00farovn\u011b komprese s vyu\u017eit\u00edm n\u00e1stroje xz dos\u00e1hly 4,7 a 5,5n\u00e1sobku, byly-li pou\u017eity. Cenos\u00ed vysok\u00e9 \u00fa\u010dinnosti komprese je n\u00edzk\u00e1 rychlost komprese a velk\u00e9 po\u017eadavky na zdroje (minim\u00e1ln\u011b 4 GB RAM). Na syst\u00e9mu s GPU RTX 4090 dosahuje v\u00fdkon komprese p\u0159ibli\u017en\u011b 1 MB\/s.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0424\u0440\u0430\u043d\u0446\u0443\u0437\u0441\u043a\u0438\u0439 \u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u043a \u0424\u0430\u0431\u0440\u0438\u0441 \u0411\u0435\u043b\u043b\u0430\u0440 (Fabrice Bellard), \u043e\u0441\u043d\u043e\u0432\u0430\u0432\u0448\u0438\u0439 \u0432 \u0441\u0432\u043e\u0451 \u0432\u0440\u0435\u043c\u044f \u043f\u0440\u043e\u0435\u043a\u0442\u044b QEMU, FFmpeg, BPG, QuickJS, TinyGL \u0438 TinyCC, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0444\u043e\u0440\u043c\u0430\u0442 \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0437\u0432\u0443\u043a\u0430 TSAC \u0438 \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0439 \u0441 \u043d\u0438\u043c \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0439 \u0434\u043b\u044f \u0441\u0436\u0430\u0442\u0438\u044f \u0438 \u0440\u0430\u0441\u043f\u0430\u043a\u043e\u0432\u043a\u0438 \u0437\u0432\u0443\u043a\u043e\u0432\u044b\u0445 \u0444\u0430\u0439\u043b\u043e\u0432. \u0424\u043e\u0440\u043c\u0430\u0442 \u043e\u0440\u0438\u0435\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d \u043d\u0430 \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0443 \u0434\u0430\u043d\u043d\u044b\u0445 \u0441 \u043e\u0447\u0435\u043d\u044c \u043d\u0438\u0437\u043a\u0438\u043c \u0431\u0438\u0442\u0440\u0435\u0439\u0442\u043e\u043c, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, 5.5 kb\/s \u0434\u043b\u044f \u043c\u043e\u043d\u043e \u0438 7.5 kb\/s \u0434\u043b\u044f \u0441\u0442\u0435\u0440\u0435\u043e, \u043f\u0440\u0438 \u0441\u043e\u0445\u0440\u0430\u043d\u0435\u043d\u0438\u0438 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