{"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\/it\/blog\/novosti-interneta\/osnovatel-qemu-i-ffmpeg-opublikoval-zvukovoj-kodek-tsac","title":{"rendered":"Il fondatore di QEMU e FFmpeg ha pubblicato il codec audio TSAC","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Il matematico francese Fabrice Bellard, fondatore dei progetti QEMU, FFmpeg, BPG, QuickJS, TinyGL e TinyCC, ha pubblicato il formato di codifica audio TSAC e gli strumenti correlati per la compressione e la decompressione dei file audio. Il formato \u00e8 orientato alla trasmissione di dati a bassissimo bit rate, ad esempio, 5.5 kb\/s per il mono e 7.5 kb\/s per lo stereo, mantenendo una qualit\u00e0 accettabile per la musica e il parlato. L'uso di TSAC permette di comprimere una composizione musicale della durata di 3.5 minuti e con frequenza di campionamento di 44.1 kHz (stereo) in un file di dimensione 192 KB, che sar\u00e0 quasi indistinguibile dall'originale per l'orecchio di un ascoltatore non esperto. Il codice del progetto \u00e8 distribuito con licenza MIT.    <\/p>\n<p>Come base per la creazione di TSAC \u00e8 stato utilizzato il codec audio Descript, che \u00e8 stato ampliato per supportare l'audio stereo e adattato per utilizzare un diverso modello di apprendimento automatico basato su una rete neurale con architettura \"transformer\", che ha consentito di aumentare il grado di compressione grazie alla ricostruzione dei dettagli persi tenendo conto del modello di percezione uditiva umana. Il modello occupa circa 200 MB in formato compresso ed \u00e8 presentato in una rappresentazione deterministica, che garantisce di ottenere lo stesso risultato indipendentemente dalla CPU\/GPU utilizzate e dal numero di thread impiegati nei calcoli.        <\/p>\n<p>Il codec pu\u00f2 funzionare utilizzando solo la CPU per i calcoli (per aumentare la velocit\u00e0, sono supportate le istruzioni AVX2), ma per ottenere elevate prestazioni si raccomanda di utilizzare la GPU. Nella versione attuale \u00e8 possibile utilizzare l'API CUDA per l'accelerazione con GPU NVIDIA basate su architetture Ampere, ADA e Hopper (RTX 3090, RTX 4090, RTX A6000, A100 e H100), che abbiano almeno 4 GB di memoria video. Per la conversione dei file audio prima della codifica viene utilizzato FFmpeg.     <center>          original<source src=\"https:\/\/bellard.org\/tsac\/21-classic.441.wav\" type=\"audio\/wav\">stereo 6.21 kb\/s<source src=\"https:\/\/bellard.org\/tsac\/classic_stereo.wav\" type=\"audio\/wav\">mono 4.71 kb\/s<source src=\"https:\/\/bellard.org\/tsac\/classic_mono.wav\" type=\"audio\/wav\">stereo 2.57 kb\/s<source src=\"classic_stereo_q5.wav\" type=\"audio\/wav\"><\/center>      <\/p>\n<p>Inoltre, \u00e8 possibile segnalare l'aggiornamento dello strumento ts_zip sviluppato da Bellard, concepito per la compressione efficiente dei dati testuali, utilizzando un meccanismo di previsione dei token basato su un sistema di apprendimento automatico e sul grande modello linguistico RWKV 169M v4. Durante la compressione dell'archivio di Wikipedia, lo strumento ts_zip ha permesso di comprimere i dati di 7.3 volte, mentre per la compressione del codice del kernel Linux 1.2 si \u00e8 raggiunto un fattore di compressione di 7.8 volte. A titolo di confronto, i livelli di compressione utilizzando lo strumento xz sono stati di 4.7 e 5.5 volte, rispettivamente. A fronte dell'elevata efficienza di compressione, la velocit\u00e0 di compressione \u00e8 bassa e ci sono grandi requisiti di risorse (minimo 4 GB di RAM). Su un sistema con GPU RTX 4090, la velocit\u00e0 di compressione \u00e8 di circa 1 MB\/s.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=61113\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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 [&hellip;]<\/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<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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, 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Il formato \u00e8 progettato per la trasmissione di dati a bitrate molto basso, ad esempio 5.5 kb\/s per il mono e 7.5 kb\/s per lo stereo, mantenendo","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/osnovatel-qemu-i-ffmpeg-opublikoval-zvukovoj-kodek-tsac","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041e\u0441\u043d\u043e\u0432\u0430\u0442\u0435\u043b\u044c QEMU \u0438 FFmpeg \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0437\u0432\u0443\u043a\u043e\u0432\u043e\u0439 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