Kutulutsidwa kwa laibulale ya SVT-AV1 3.0 (Scalable Video Technology AV1) kwasindikizidwa ndikukhazikitsa kwa encoder ndi decoder ya AV1 kanema kabisidwe kawonekedwe, kuti ifulumizitse momwe njira zama computing zofananira zomwe zilipo mu Intel CPUs zamakono zimagwiritsidwa ntchito. Pulojekitiyi idapangidwa ndi Intel mothandizana ndi Netflix ndi cholinga chokwaniritsa magwiridwe antchito oyenera pamayendedwe apakanema apakanema ndikugwiritsa ntchito mautumiki a pavidiyo pakufunika (VOD). Pakali pano, chitukuko chikuchitika mothandizidwa ndi Open Media Alliance (AOMedia), yomwe imayang'anira chitukuko cha AV1 kanema kabisidwe kawonekedwe. M'mbuyomu, ntchitoyi idapangidwa mkati mwa projekiti ya OpenVisualCloud, yomwe imapanganso ma encoder a SVT-HEVC ndi SVT-VP9. Khodiyo imagawidwa pansi pa layisensi ya BSD.
SVT-AV1 ikhoza kupangidwa kuti ikhale ndi machitidwe otengera kamangidwe kalikonse komwe kuli kophatikiza komwe kumathandizira muyezo wa C99, koma ntchito yabwino kwambiri imatheka pa machitidwe a x86_64 omwe amagwiritsa ntchito kukhathamiritsa kwa assembler kutengera malangizo a SIMD (thandizo la AVX2 mu CPU ndilofunika, koma SS2 ndiyokwanira pang'ono). Kugwiritsa ntchito kukumbukira kumadalira kuchuluka kwa ma processor cores omwe amaphatikizidwa ndi encoding, yomwe imayendetsedwa ndi "--lp". Chifukwa cha zovuta za ma aligorivimu omwe amagwiritsidwa ntchito mu AV1, kuyika mawonekedwewa kumafuna zinthu zambiri kuposa mawonekedwe ena, mwachitsanzo, encoder yokhazikika kuchokera ku projekiti ya AV1 imafuna kuwerengera nthawi 5721, 5869 ndi 658 kuposa ma encoder x264 (mbiri "main"), x264 (profile "high" ndi libvpx.
Zina mwa zosintha pakutulutsidwa kwatsopano kwa SVT-AV1:
- Kukhathamiritsa kwaubwino/kuthamanga kwa zosintha zomwe zimakhazikitsa masikelo apakatikati komanso apamwamba. Mu "fast-decode 2" mode kwa presets M3-M10, liwiro linakula ndi 15-25% pamene kusunga mlingo khalidwe. Kwa presets M0-M2, mlingo wapamwamba wawonjezeka ndi pafupifupi 1% poyesedwa pogwiritsa ntchito njira ya BD-Rate (Bjontegaard-Delta).
- Mu "fast-decode 1" mode, poyerekeza ndi "fast-decode 0", kuchuluka kwa ma decoding cycle kunachepetsedwa ndi pafupifupi 10% ndi kuwonjezeka kwa kutaya kwa 1% kokha malinga ndi BD-Rate metric.
- Pamakina a ARM, kukhathamiritsa pogwiritsa ntchito zowonjezera za Neon ndi SVE2 zayatsidwa, zomwe zapangitsa kuti pakhale kusintha kwa magwiridwe antchito a 10-25% polemba mitsinje yakuya kwamtundu wapamwamba pamalingaliro a 480p-1080p.
- Zosintha zasungidwa kuchokera pa foloko ya SVT-AV1-SPY yomwe imawongolera zomwe zimawoneka bwino mukamagwiritsa ntchito "tune 0".
- Mawonekedwe a "avif" owonjezera, omwe amawononga zinthu zochepa polemba zithunzi zosasunthika.
- Mayeso owongolera a ma code pogwiritsa ntchito malangizo a Arm Neon ndi SVE2.
Source: opennet.ru
