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コロナ禍でのライブストリーミングの変化とテレビ放送の規格について
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Shumpei Urabe
June 19, 2021
Technology
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コロナ禍でのライブストリーミングの変化とテレビ放送の規格について
Fukuoka Video Tech Meetup #1
https://www.meetup.com/fukuoka-video-tech/events/278185662/
Shumpei Urabe
June 19, 2021
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Transcript
ίϩφՒͰͷ ϥΠϒετϦʔϛϯάͷมԽͱ ςϨϏ์ૹͷن֨ʹ͍ͭͯ 2021.06.19 NAXAגࣜձࣾ ෦ ॡฏ
ࣗݾհ ෦ ॡฏ • NAXAגࣜձࣾ දऔకࣾ • ܦӦͱӦۀͱιϑτΣΞΤϯδ χΞͱݚڀ։ൃΛߦͳ͍ͬͯΔ •
࠷ۙ Unikernel ʹڵຯΛ࣋ͪ࢝ Ί͍ͯΔ • ͖ͳԻFraunhofer FDK AACɺ ݏ͍ͳԻFFmpeg AAC Encoder
དྷि͜͜Ͱ͠·͢
ίϩφʹΑΔੜ׆ͷେ͖ͳมԽ 1.
w ৽ܕίϩφΠϧεͷຮԆʹΑΓɺࢲͨͪͷੜ׆େ෯ʹ มԽ͠·ͨ͠ w ࠓ·Ͱର໘Ͱͷଧͪ߹Θ͕ͤϦϞʔτલఏʹͳΓɺΦϑΟ εͳͦ͘͏ͱ͍͏औΓΈ͕૿͍͑ͯ·͢ ίϩφʹΑΔੜ׆ͷେ͖ͳมԽ
w ࢲͷձࣾͰɺΦϑΟε͋Δͷͷɺجຊతʹग़ࣾͤ ͣʹࡏͰۈ͍ͯ͠·͢ w ͨͩɺࡏͷ߹ɺେมͳ͜ͱଟʑ͋Γ·͢ ίϩφʹΑΔੜ׆ͷେ͖ͳมԽ
ίϩφʹΑΔੜ׆ͷେ͖ͳมԽ w ྫ͑ɺ&MFNFOUBM-JWFΛྡʹஔ͍ͯݕূ͕͍͠😢
ίϩφʹΑΔੜ׆ͷେ͖ͳมԽ w ॳͱ࠷৽ੈ͕ྑ͘ಉډʂ w ࣨԹ͘Β͍ͷੈք͔Βۭ ྫྷͷੈքʂ
ຊͷϥΠϒ৴ϓϥοτϑΥʔϜͷมԽ 2.
w ίϩφՒҎલ͔ΒɺϥΠϒ৴ͷधཁߴ·͍ͬͯ·ͨ͠ w ͔͠͠ɺ༗؍٬ͷެԋ͕ࢦࣔͰ։࠵ෆՄೳʹͳͬͯ͠ ·ͬͨࠓɺແ؍٬ͰͷϥΠϒ৴Λͤ͟Δಘͳ͍ঢ়گʹͳ Γ·ͨ͠ ϥΠϒ৴ϓϥοτϑΥʔϜ͕ന
w ͜ͷͰɺࢢՁେ෯ʹ্͕Γ·ͨ͠ w ࠓޙࢢنେ͖֦͘େ͢ΔͱࢥΘΕ ·͕͢ɺίϩφऴᖼޙʹࠓޙΤϯλʔςΠ ϝϯτ͕Ͳ͏ͳ͍ͬͯ͘ͷ͔·͔ͩΓ ·ͤΜ ϥΠϒ৴ϓϥοτϑΥʔϜ͕ന ಈը৴ࢢௐࠪϨϙʔτ %"$+
ΑΓҾ༻ IUUQTQSUJNFTKQNBJOIUNMSEQIUNM
w ϥΠϒ৴ʹଟ͘ͷ՝͕͋Γ·͢ w ౦ژͷௐࠪʹΑΔͱɺݟ͍ͯͳ͍ਓ ͕ɺݟ͍ͯΔਓͷ͏ͪɺ1$Ͱ ͷࢹௌ͕ͱͳΓ·ͨ͠ w ϞόΠϧͰͷࢹௌΑΓ1$͕ଟ ͍ͷͱͯڵຯਂ͍ͱࢥ͍·͢ ϥΠϒ৴ϓϥοτϑΥʔϜ͕ന
౦ژ৽ܕίϩφΠϧεײછʹ͏ϗʔϧɾܶͷؑऀҙࣝௐࠪ݁Ռʢใ൛ʣΑΓҾ༻ IUUQTNFUSPUPLZPMHKQUPTFJIPEPIBQQZPQSFTTEPDVNFOUTQEG
τϥϑΟοΫਪҠʹ͍ͭͯ 3.
τϥϑΟοΫͷਪҠ +1/"1શମͷτϥϑΟοΫ ݄ݱࡏʣΑΓҾ༻ IUUQTXXXKQOBQOFUJYUSB ff i DIUNM +1*9टݍτϥώοΫ ݄ݱࡏʣΑΓҾ༻ IUUQTXXXKQJYBEKQKQUFDIOJDBM@USB
ff i DQIQ w ओཁ*9ͷؒτϥϑΟοΫਪҠΛݟ͍ͯΔͱɺ͔ͳΓ૿େ͍ͯ͠Δ͜ͱ͕͔Γ·͢
τϥϑΟοΫͷਪҠ ૯লɹզ͕ࠃͷΠϯλʔωοτʹ͓͚ΔτϥώοΫͷूܭɾࢼࢉʢ݄ͷूܭ݁ՌʣΑΓҾ༻ IUUQTXXXTPVNVHPKQNFOV@OFXTTOFXTLJCBO@IUNM
τϥϑΟοΫͷਪҠ ૯লɹզ͕ࠃͷΠϯλʔωοτʹ͓͚ΔτϥώοΫͷूܭɾࢼࢉʢ݄ͷूܭ݁ՌʣΑΓҾ༻ IUUQTXXXTPVNVHPKQNFOV@OFXTTOFXTLJCBO@IUNM
w ίϩφҎલʹൺΔͱɺτϥϑΟοΫྔ͔ͳΓ૿͍͑ͯΔ͜ͱ͕Θ͔Γ·͢ w ΣϒձٞͷྲྀߦɺࡏϫʔΫ͕ϝΠϯʹͳͬͨࠓɺࢲͨͪͷੜ׆ʹΠϯλʔωοτ ͔ܽͤͳ͍ଘࡏͰ͢ w ಈըͷੈքͰɺ:PV5VCF͕"7Λαϙʔτ࢝ΊͨΓɺ"QQMF͕71ͷϋʔυΣΞσ ίʔσΟϯάΛαϙʔτͨ͠Γɺѹॖٕज़ʑਐาΛ͍͛ͯ·͕͢ɺѹॖٕज़ͷਐาͱ ͱʹ,ίϯςϯπ͕૿͑ͨΓɺԻָͷϩεϨε৴͕૿͑ͨΓɺσʔλαΠζͱͯ͠େ ͖͘ͳ͍ͬͯΔҹͰ͢
τϥϑΟοΫͷਪҠ
์ૹͷIPԽʹ͍ͭͯ 4.
w ैདྷͷσδλϧ์ૹͱͯ͠ɺ্σδλϧ์ૹɺ#4σδλϧ์ૹɺ$4σδλϧ์ૹ ͷ͕ͭ͋Γ·͢ w ͦΕʹ߹ΘͤͯɺΑΓελʔτͨ͠#4,ɺ$4,ɺ#4,ɺ͜ΕΒΛ߹Θͤͯ ৽,,Ӵ์ૹͱݺͿ͜ͱ͋Γ·͢ "1"#༻ޠ ຊͷσδλϧ์ૹ
w ʹ#4σδλϧ์ૹ͕։࢝͞Εɺͦͷޙʹ্σδλϧ์ૹ։࢝͞Ε·ͨ͠ w ݄ʹΞφϩά์ૹΛऴྃ͠ɺશʹ্σδλϧ์ૹͱΓସΘΓ· ͨ͠ w ্σδλϧ์ૹJ YJ·ͨYJ ͷ࣌ߴղ૾ͩͬͨͷ Ͱ͕͢ɺݱࡏͰɺQ৴Q৴͕ओྲྀͱͳΓɺ্σδλϧ์ૹͷ
ن֨ϨΨγʔʹͳΓͭͭ͋Γ·͢ w #4σδλϧ์ૹͰɺશͯJ YJ Ͱ͢ ্σδλϧ์ૹ / BSσδλϧ์ૹ
w ্σδλϧ์ૹͰɺ6)'ଳͷ.)[͔Β.)[ΛDIʹ͚ɺDI .)[ ͕ηάϝϯτʹ ͔Ε͍ͯ·͢ w ͦͷ͏ͪɺηάϝϯτΛϑϧηά )%57 ʹ͍ɺηάϝϯτΛҠಈػثͷͨΊʹඪ४ը࣭์ૹͱͯ͠ ΘΕ͍ͯ·͢ɻ͜ΕΛϫϯηάͱݴ͍·͢ɻ
w ϫϯηάɺYͷ27("Ͱ์ө͞Ε͓ͯΓɺྺ࢙తࣄͰ)"7$͕ΘΕ͍ͯ·͢ɻ w ϏοτϨʔτ࠷େLCQTʢͦͷ͏ͪେ·͔ʹಈը͕LCQTɺԻ͕CQT΄Ͳʣ w ϑϨʔϜϨʔτGQT w ͨͩɺۙΧʔφϏήʔγϣϯͳͲͷҠಈʹ͓͍ͯɺड৴ޮ෮ௐͷԋࢉೳྗ্ʹΑΓϑϧηάͰड ৴Ͱ͖Δ͜ͱ͕ଟ͘ͳΓ·ͨ͠ ϫϯηά
w $4σδλϧ์ૹɺεΧύʔ+4"5גࣜձ͕ࣾӡӦ͍ͯ͠ΔεΧύʔʂͱݺΕΔαʔϏε ʹΑΓఏڙ͞Ε͍ͯ·͢ w εΧύʔӴجװ์ૹہͱݺΕɺి๏ʹΑΓӴ์ૹʹରͯ͠໔ڐ͞Ε͍ͯ·͢ w εΧύʔຽؒओମͱ͍͏͜ͱ͋Γɺ$4σδλϧ์ૹ#4σδλϧ์ૹͱൺɺҧ͏෦ ͕͍͔ͭ͋͘Γ·͢ w ྫ͑ɺ্ɾ#4σδλϧ์ૹ͕*4%#ͱݺΕΔ/),͕த৺ͱͳͬͯ։ൃͨ͠ํࣜʹର
͠ɺ%7#ͱݺΕΔࠃࡍن֨Λ࠾༻͍ͯ͠·͢ CSσδλϧ์ૹ
w εΧύʔʹɺ౦ܦʹҐஔ͍ͯ͠Δ௨৴ӴΛ͍·͢ɻ͜ͷɺ#4σδλϧ์ૹͰ༻͍ΒΕΔ Ӵͱܦ͕ಉ͡Ͱ͢ w ରͯ͠ɺεΧύʔʂϓϨϛΞϜαʔϏεͰɺ౦ܦٴͼʹҐஔ͠·͢ʢͱͱͰӡ༻͠ ͍ͯͨຊσδλϧ์ૹαʔϏεͷ1FSGFD57ͱͰӡ༻͍ͯͨ͠+εΧΠ#ͷ4,:͕౷߹ͨͨ͠Ί w ·ͨɺεΧύʔॳ.1&(ϕʔεͷ*4%#4%7#4Λ͍ͬͯ·͕ͨ͠ɺʹ)ϕʔεͷ %7#4ʹશҠߦ͠·ͨ͠
w #4σδλϧ์ૹͱൺΔͱɺө૾ූ߸Խʹ)Λ࠾༻͍ͯ͠ΔͨΊɺѹॖޮ͕Α͘ɺը࣭ྑ͍ͱݴΘΕ ͍ͯ·͢ɻεΧύʔʂ,Ͱ))&7$͕࠾༻͞Ε͍ͯ·͢ εΧύʔͷछྨ
w ैདྷɺຊͷӴ์ૹͰӈટ͕ΘΕ͍ͯ·ͨ͠ɻӈટͱɺӈટԁภͷ͜ͱͰɺӴ͔Βൃࣹ͞ΕΔి ͷճΓํ͕ӈճΓͷ͜ͱΛ͍͍·͢ w ͦΕʹରͯ͠ɺରଆͷࠨճΓΛࠨટͱ͍͍·͕͢ɺ#4,$4,ͰࠨટΘΕ͍ͯ·͢ w ӈટɺ#4σδλϧ์ૹ$4σδλϧ์ૹͰपଳҬͷۭ͖͕ͳ͘ͳͬͨͨΊɺࠨટ͕ΘΕΔΑ͏ʹͳ Γ·ͨ͠ w ͳ͓ɺࠨટʹରԠ͢Δʹड৴ػͷ΄͔ɺΞϯςφରԠ͕ඞཁͰ͢
ӈટͱࠨટʹ͍ͭͯ 1032 1489 1595 2071 2224 2681 2748 3224 BS(ӈટ) 110CS(ӈટ) BS4K(ࠨટ) 110CS4K(ࠨટ) 124ɺ128CS(ӈટ) (MHz)
ISDB-T / ISDB-S / ISDB-S3ͱ֤छൺֱ ์ૹํࣜ ISDB-T(σδ) ISDB-S(BS) ISDB-S3(BS4K) มௐํࣜ
64QAM(12 Seg) TC8PSK 16APSK ૹଳҬ෯ 6MHz 34.5MHz 34.5MHz ޡΓగਖ਼ූ߸ ϦʔυιϩϞϯ(֎ූ ߸)ɺࠐΈ(ූ߸) ϦʔυιϩϞϯ(֎ූ ߸)ɺࠐΈ(ූ߸) BCH(֎ූ߸)ɺ LDPC(ූ߸) 1தܧػ͋ͨΓͷϏ οτϨʔτ 23Mbps 52Mbps 99Mbps ଟॏԽํࣜ MPEG2 TS MPEG2 TS MMTɾTLV ө૾ූ߸Խํࣜ MPEG2-Video MPEG2-Video / H.264 AVC H.265 HEVC Իූ߸Խํࣜ MPEG-2AAC MPEG2-AAC / MPEG-2 Audio BC MPEG - 4 AAC / MPEG-4 ALS
w ..5ͱɺ.1&(.FEJB5SBOTQPSUͷུশͰɺैདྷͷτϥϯεϙʔτํࣜͰ͋Δ.1&( 54ͷޙܧن֨Ͱ͢ w ..5ɺ͞·͟·ͳΞϓϦέʔγϣϯʹରԠͰ͖ΔΑ͏ʹܾΊΒΕͨن֨Ͱɺશͯ*1Ͱૹ ΔΈͰ͢ɻ͜ΕʹΑΓ์ૹͱ௨৴Λͭͷϓϩτίϧʹू͢Δ͜ͱ͕Ͱ͖·͢ w ..5.1&(54ͱൺͯɺଟ͘ͷͰ༏Ε͍ͯ·͢ɻྫ͑ɺύέοταΠζ͕Մมௐ Ͱ͋ͬͨΓɺ'SBHNFOUFE.1ͷΑ͏ʹө૾Λϑϥάϝϯτͱͯ͠ѻ͑Δ.'6ɺ.1&( 54Ͱࢄʑ·͞Εͨ4ZTUFN5JNF$MPDL͕ɺ..5Ͱ65$ͰͤΔΑ͏ʹͳͬͨ
ͷͰਖ਼֬ͳ࣌ؒಉظ͕ՄೳʹͳΓ·ͨ͠ MMTʹ͍ͭͯ
MMTͷϓϩτίϧελοΫ ө૾ɾԻɾσʔλ GFD (Generic File Delivery) MFU MPU (Media
Processing Unit) MMT γάφϦϯά (੍ޚϝοηʔδ) MMTPϖΠϩʔυ(AL-FEC) MMTPύέοτ MFU MFU MFU MMTͰɺϑΝΠϧ ૹՄೳͰ͋Δ(MFU/MPUʹΧ ϓηϦϯάԽ͞ΕΔ) ޡΓగਖ਼ʹΑΓ࣭Λ֬อʂ
ଞͷϓϩτίϧͱͷൺֱ MFU/MPU MMT Payload MMT Packet PES / Section TS
Payload TS Packet RTP Payload RTP Packet MMT MPEG2 TS RTP
์ૹૹ࿏ͷϨΠϠʔϞσϧ TMCC NTP ө૾ HEVC Ի AAC, ALS ࣈນ ࣈນූ߸Խ
MMT- SI ΞϓϦ(EPG) HTML 5 ίϯςϯπ μϯϩʔυ MMT σʔλૹํࣜ UDP/IP TLV ์ૹ ड৴ػͷϑΝʔϜΣ Ξ(ΤϯδχΞϦϯάαʔ Ϗε)ͳͲMMTΛΘͣ IPͰૹ͢Δ
௨৴ճઢͷϨΠϠʔϞσϧ NTP ө૾ HEVC Ի AAC, ALS ࣈນ ࣈນූ߸Խ MMT-
SI ΞϓϦ(EPG) HTML 5 ίϯςϯπ μϯϩʔυ MMT σʔλૹ UDP/IP, TCP/IP ௨৴ HTTP UDP/IP TCP/IP
w 5-7ͱɺ5ZQF-FOHUI7BMVFͱ͍͏ϑΥʔϚοτͷҰछͰ͢ɻϓϩτίϧͰ͋Γ·ͤΜɻ w 5-7ۙͳͱ͜Ζͩͱɺ5-444)ɺ*4*4ʢϧʔςΟϯάϓϩτίϧ 3"%*64ͳͲɺωοτϫʔ ΫͷੈքͰଟ͘ΘΕ͍ͯ·͢ w ࠓճ5-7ΛͬͯՄมύέοτΛ࣮ݱ͍ͯ͠·͢ TLVʹ͍ͭͯ Type
Length Value 4Bytes 4Bytes Variable Bytes
w ..5Λ5-7Λ͍ɺՄมύέοτʹ͠ɺͦΕΛଟॏԽͨ͠ͷΛ5-7ετϦʔϜͱ͍͍· ͢ʢిͰɺݶΓ͋ΔࢿݯΛ༗ޮ׆༻͢ΔͨΊͷ༷ʑͳ৴߸Λॏͯ͠ૹΔඞཁ͕͋Γɺ ͜ΕΛଟॏԽͱݺͿʣ w 5-7ετϦʔϜ#ZUFTͷݻఆͰׂ͞Εɺૹ͞ΕΔɻ͜ΕΛׂ5-7ύέοτͱ ͍͍·͢ w 5-7ύέοτͰૹ͢ΔࡍʹɺมௐपબہʹඞཁͳใΛૹΔͷʹ5-7/*5 5-7
/FUXPSL*OGPSNBUJPO5BCMF ͕ΘΕ·͢ TLVετϦʔϜʹ͍ͭͯ
w ͜͏ͯ͠ଟॏԽʹΑΓѻ͍͘͢ɺ·ͨ์ૹͱ௨৴Λͭʹѻ͏ͨΊʹ..55-7ੜ͠ ·ͨ͠ w 5-7Λ͏͜ͱͰɺ৭ʑͳσʔλΛɺ5ZQF͝ͱʹ͍͚Δ͜ͱ͕Ͱ͖·͢ w ͜ͷٕज़ΛԠ༻ͯ͠.1&(54PWFS..5ݱࡏ༷ͱͯ͋͠Γ·͢ w ͞Βʹ..5$."'ͱੑ͕͔ͳΓߴ͍ͷͰɺݱࡏ$."'ରԠ͕Ͱ͖ͳ͍͔ݚڀ͕ਐΊ ΒΕ͓ͯΓ·͢
MMT/TLVʹ͍ͭͯ
w ݱࡏɺ૯লͰɺ࣍ੈ্σδλϧ์ૹͷಈ͖͕׆ൃͱͳ͓ͬͯΓɺ"777$ &7$ͱ͍ͬͨίʔσοΫͷௐࠪͳͲ͕ߦΘΕ͓ͯΓ·͢ w ઌ΄Ͳઆ໌ͨ͠..55-7ࠓޙΘΕΔՄೳੑඇৗʹߴ͘ɺ*4%#5ͷޙܧͱͳΔͷ ͕͍ͭੜ͢Δͷ͔ͪԕ͍͠Ͱ͢ ࣍ੈ্σδλϧ์ૹʹ͍ͭͯ
Thank you