{"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\/pl\/blog\/news\/osnovatel-qemu-i-ffmpeg-opublikoval-zvukovoj-kodek-tsac","title":{"rendered":"Za\u0142o\u017cyciel QEMU i FFmpeg opublikowa\u0142 kodek d\u017awi\u0119kowy TSAC","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Francuski matematyk Fabrice Bellard, za\u0142o\u017cyciel projekt\u00f3w QEMU, FFmpeg, BPG, QuickJS, TinyGL i TinyCC, opublikowa\u0142 format kodowania d\u017awi\u0119ku TSAC oraz powi\u0105zane narz\u0119dzia do kompresji i dekompresji plik\u00f3w d\u017awi\u0119kowych. Format ten jest zoptymalizowany do przesy\u0142ania danych z bardzo niskim bitrate'em, na przyk\u0142ad 5,5 kb\/s dla mono i 7,5 kb\/s dla stereo, przy zachowaniu akceptowalnej jako\u015bci muzyki i mowy. U\u017cycie TSAC pozwala na spakowanie utworu muzycznego o d\u0142ugo\u015bci 3,5 minut i cz\u0119stotliwo\u015bci pr\u00f3bkowania 44,1 kHz (stereo) w plik o rozmiarze 192 KB, kt\u00f3ry prawie nie r\u00f3\u017cni si\u0119 od orygina\u0142u dla nieprzeszkolonego ucha. Kod projektu jest udost\u0119pniany na licencji MIT. <\/p>\n

Podczas tworzenia TSAC wykorzystano kodek d\u017awi\u0119kowy Descript, kt\u00f3ry zosta\u0142 rozszerzony o wsparcie dla d\u017awi\u0119ku stereo i przet\u0142umaczony na u\u017cycie innego modelu uczenia maszynowego opartego na architekturze \"transformera\", co pozwoli\u0142o na zwi\u0119kszenie stopnia kompresji dzi\u0119ki rekonstrukcji utraconych detali z uwzgl\u0119dnieniem modelu ludzkiego postrzegania s\u0142uchu. Model zajmuje oko\u0142o 200 MB w skompresowanej formie i jest zaprezentowany w deterministycznej formie, co gwarantuje uzyskanie tych samych wynik\u00f3w niezale\u017cnie od u\u017cywanych CPU\/GPU i liczby w\u0105tk\u00f3w zaanga\u017cowanych w obliczenia. <\/p>\n

Koduj\u0105cy mo\u017ce pracowa\u0107, wykorzystuj\u0105c do oblicze\u0144 jedynie CPU (dla przyspieszenia wspierane s\u0105 instrukcje AVX2), ale dla osi\u0105gni\u0119cia wysokiej wydajno\u015bci zaleca si\u0119 wykorzystywanie GPU. W obecnej wersji mo\u017ce by\u0107 stosowane API CUDA dla przyspieszenia z u\u017cyciem GPU NVIDIA opartego na mikroarchitekturach Ampere, ADA i Hopper (RTX 3090, RTX 4090, RTX A6000, A100 i H100), kt\u00f3re maj\u0105 co najmniej 4 GB pami\u0119ci wideo. Do przekszta\u0142cania plik\u00f3w d\u017awi\u0119kowych przed kodowaniem stosuje si\u0119 FFmpeg.

oryginalnystereo 6,21 kb\/smono 4,71 kb\/sstereo 2,57 kb\/s<\/center> <\/p>\n

Dodatkowo mo\u017cna zauwa\u017cy\u0107 aktualizacj\u0119 rozwijanej przez Bellara narz\u0119dzia ts_zip, przeznaczonego do efektywnego kompresowania danych tekstowych, z wykorzystaniem mechanizmu przewidywania token\u00f3w opartego na systemie uczenia maszynowego i du\u017cym modelu j\u0119zykowym RWKV 169M v4. Podczas kompresji archiwum z Wikipedii narz\u0119dzie ts_zip pozwoli\u0142o na skompresowanie danych w 7.3 razy, a podczas kompresji kodu j\u0105dra Linux 1.2 \u2013 w 7.8 razy. Dla por\u00f3wnania, poziomy kompresji przy u\u017cyciu narz\u0119dzia xz wynios\u0142y odpowiednio 4.7 i 5.5 razy. Cennikiem wysokiej efektywno\u015bci kompresji jest niska pr\u0119dko\u015b\u0107 kompresji i du\u017ce wymagania dotycz\u0105ce zasob\u00f3w (minimum 4 GB RAM). Na systemie z GPU RTX 4090 wydajno\u015b\u0107 kompresji wynosi oko\u0142o 1 MB\/s.
\n
\u0179r\u00f3d\u0142o: 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 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-115540","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Za\u0142o\u017cyciel QEMU i FFmpeg opublikowa\u0142 kodek d\u017awi\u0119kowy TSAC | ProHoster","description":"Francuski matematyk Fabrice Bellard, za\u0142o\u017cyciel projekt\u00f3w QEMU, FFmpeg, BPG, QuickJS, TinyGL i TinyCC, opublikowa\u0142 format kodowania d\u017awi\u0119ku TSAC oraz powi\u0105zane z nim 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