{"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\/et\/blog\/novosti-interneta\/osnovatel-qemu-i-ffmpeg-opublikoval-zvukovoj-kodek-tsac","title":{"rendered":"QEMU ja FFmpeg asutaja avaldas helikoodeki TSAC","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Prantsuse matemaatik Fabrice Bellard, kes asutas kunagi projektid QEMU, FFmpeg, BPG, QuickJS, TinyGL ja TinyCC, avaldas helikodeerimise vormingu TSAC ja sellega seotud t\u00f6\u00f6riistad helifailide kokkusurumiseks ja dekompressimiseks. Vorming on suunatud andmete edastamisele v\u00e4ga madala bittikiirusel, n\u00e4iteks 5.5 kb\/s mono ja 7.5 kb\/s stereo puhul, s\u00e4ilitades samas vastuv\u00f5etava kvaliteedi muusikas ja k\u00f5nes. TSAC kasutamine v\u00f5imaldab pakkida 3.5 minuti pikkuse muusikakompositsiooni, mille prooviv\u00f5tufrekvents on 44.1 kHz (stereo), faili suurusega 192 KB, mis on peaaegu eristamatu originaalist tavalise kuulaja jaoks. Projekti kood on saadaval MIT litsentsi alusel. <\/p>\n

TSACi loomisel kasutati helikoodekit Descript, mis on laiendatud stereoheli toetamiseks ja kohandatud uue tehisintellekti mudeli kasutamiseks, mille aluseks on «transformeri» arhitektuur. See on v\u00f5imaldanud suurendada tihendamise taset, tuginedes kadunud detailide rekonstrueerimisele, arvestades inimk\u00f5rva kuulmismudelit. Mudel maht on umbes 200 MB kompressitud kujul ja see esitatakse deterministlikus vormingus, mis tagab sama tulemuse s\u00f5ltumata kasutatavast CPU\/GPU-st ja arvutustes kasutatavate l\u00f5imede arvust. <\/p>\n

Kodeerija saab t\u00f6\u00f6tada vaid CPU kasutades (kiirendamiseks toetatakse AVX2 juhiseid), kuid k\u00f5rge j\u00f5udluse saavutamiseks on soovitatav kasutada GPU-d. Praeguses versioonis v\u00f5ib kasutada CUDA API-d, et kiirendada t\u00f6\u00f6tlemist NVIDIA GPU-del, mis p\u00f5hinevad mikroarhitektuuridel Ampere, ADA ja Hopper (RTX 3090, RTX 4090, RTX A6000, A100 ja H100), millel on v\u00e4hemalt 4 GB videom\u00e4lu. Helifailide konverteerimiseks enne kodeerimist kasutatakse FFmpeg'i.

originalstereo 6.21 kb\/smono 4.71 kb\/sstereo 2.57 kb\/s<\/center> <\/p>\n

Lisaks tasub m\u00e4rkida Bellari poolt arendatava utiliidi ts_zip uuendust, mis on m\u00f5eldud tekstiliste andmete efektiivseks tihendamiseks, kasutades m\u00e4rgirikutuse ennustamise mehhanismi p\u00f5hinevat tehisintellekti s\u00fcsteemi ja suurt keelemudelit RWKV 169M v4. Wikipedia arhiivi tihendamisel suutis utiliit ts_zip andmeid tihendada 7.3 korda, ja Linuxi tuumakoodi tihendamisel 1.2 \u2014 7.8 korda. V\u00f5rdluseks, utiliidi xz kasutamisel olid tihendustasemed vastavalt 4.7 ja 5.5 korda. K\u00f5rge tihenduse t\u00f5hususe hind on madal tihendamise kiirus ja suured ressursin\u00f5udmised (v\u00e4hemalt 4 GB RAM-i). RTX 4090 GPU s\u00fcsteemis on tihendamise efektiivsus umbes 1 MB\/s.
\n
Allikas: 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-novosti-interneta"],"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\udd47QEMU ja FFmpeg'i asutaja avaldas helikoodeki TSAC | ProHoster","description":"Prantsuse matemaatik Fabrice Bellard, kes asutas kunagi projektid QEMU, FFmpeg, BPG, QuickJS, TinyGL ja TinyCC, avaldas helikodeerimise vormingu TSAC ja sellega seotud t\u00f6\u00f6riistad helifailide kokkusurumiseks ja dekompressimiseks. 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