Fragmented MP4のおはなし

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'SBHNFOUFE.1ͷ͓͸ͳ͠ 4USFBNJOH$POGFSFODF 1SFTFOUFECZ!NFUFPS@TBBO

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ࣗݾ঺հ w ϝςΦ !NFUFPS@TBBO w ෱ԬʹॅΜͰ͍Δେֶ೥ੜ w ઐ໳͸ࣗવݴޠॲཧ w ࠷ۙͷझຯ͸6%1ͷύέοτଛࣦ࣌ͷϦΧόʔʹؔ͢Δݚڀ w ๭ࣾͰϥΠϒ഑৴ج൫ͷߏஙʹؔΘ͍ͬͯͨ

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-JWF4USFBNJOH'PSNBU

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-JWF4USFBNJOH'PSNBU w 35.1 w 435 w )551-JWF4USFBNJOH w .1&(%"4) w 8FC35$

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-JWF4USFBNJOH'PSNBU w 35.1 w 435 w )551-JWF4USFBNJOH w .1&(%"4) w 8FC35$

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)551-JWF4USFBNJOH w "QQMF͕։ൃɻ w 3'$ͱͯ͠ඪ४Խɻ w NVϓϨΠϦετΛ࢖ͬͯ഑৴ɻ w .1&(54'SBHNFOUFE.1 .BTUFS1MBZMJTU .FEJB1MBZMJTU 4FHNFOU 4FHNFOU .FEJB1MBZMJTU 4FHNFOU 4FHNFOU .FEJB1MBZMJTU MJTUNV QNV UT UT QNV UT UT QNV

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w .1&(-"͕։ൃɻ w *40*&$ͱͯ͠ඪ४Խɻ w 9.-Ͱॻ͔Εͨ.1%ϑΝΠϧΛ࢖͏ɻ w 'SBHNFOUFE.1 .1&(54 .1&(%"4) %ZOBNJD"EBQUJWF4USFBNJOHPWFS)551 .BOJGFTU *OJUJBM4FHNFOU 4FHNFOU 4FHNFOU .BOJGFTU 4FHNFOU 4FHNFOU .BOJGFTU MJTUNQE JOJUNT NT NT MJTUNQE NT NT MJTUNQE

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IMTKT͕ͻͨ͢Βॏ͍໰୊

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IMTKT w )-4͸جຊతʹ4BGBSJͳͲɺݶΒΕͨϒϥ΢βͰ͔͠࠶ੜग़དྷͳ͍ɻ w ͦͷͨΊɺඇରԠϒϥ΢βΛαϙʔτ͢ΔͨΊʹ͸IMTKTͱݺ͹ΕΔ +BWB4DSJQUͷϥΠϒϥϦΛ࢖͏ඞཁ͕͋Δɻ w ΄͔ʹ΋WJEFPKTDPOUSJCIMTͳͲ΋͋Δ͕ɺݱࡏओྲྀͳͷ͸IMTKTɻ

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UTEFNVYFSKT w NVΛऔಘ w 54ϑΝΠϧΛऔಘ w 54ϑΝΠϧ͔Βө૾ͱԻ੠ΛऔΓग़͢ w औΓग़ͨ͠σʔλΛ*40#.''ʹม׵͢Δ w .FEJB4PVSDF&YUFOTJPOΛ࢖ͬͯ࠶ੜ͢Δ

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UTEFNVYFSKT w NVΛऔಘ w 54ϑΝΠϧΛऔಘ w 54ϑΝΠϧ͔Βө૾ͱԻ੠ΛऔΓग़͢ w औΓग़ͨ͠σʔλΛ*40#.''ʹม׵͢Δ w .FEJB4PVSDF&YUFOTJPOΛ࢖ͬͯ࠶ੜ͢Δ

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UTEFNVYFSKT .1&(54 1"5 1.5 7JEFP%BUB "VEJP%BUB 7JEFP%BUB "VEJP%BUB ŋŋŋ

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UTEFNVYFSKT .1&(54 1"5 1.5 7JEFP%BUB "VEJP%BUB 7JEFP%BUB "VEJP%BUB ŋŋŋ ϓϩάϥϜΛऔಘ

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UTEFNVYFSKT .1&(54 1"5 1.5 7JEFP%BUB "VEJP%BUB 7JEFP%BUB "VEJP%BUB ŋŋŋ ө૾΍Ի੠ͷ1*%Λऔಘ

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UTEFNVYFSKT .1&(54 1"5 1.5 7JEFP%BUB "VEJP%BUB 7JEFP%BUB "VEJP%BUB ŋŋŋ ө૾Λநग़

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UTEFNVYFSKT .1&(54 1"5 1.5 7JEFP%BUB "VEJP%BUB 7JEFP%BUB "VEJP%BUB ŋŋŋ /"-Ϣχοτͷ৘ใΛऔಘ

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UTEFNVYFSKT .1&(54 1"5 1.5 7JEFP%BUB "VEJP%BUB 7JEFP%BUB "VEJP%BUB ŋŋŋ Ի੠Λநग़

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UTEFNVYFSKT .1&(54 1"5 1.5 7JEFP%BUB "VEJP%BUB 7JEFP%BUB "VEJP%BUB ŋŋŋ ϔομʔ৘ใΛऔಘ

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UTEFNVYFSKT .1 *40#.'' 7JEFP%BUB "VEJP%BUB GUZQ NPPW NWIE USBL NEBU 7JEFP%BUB 3FNVYJOH NQSFNVYFSKT

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UTEFNVYFSKT

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'SBHNFOUFE.1

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'SBHNFOUFE.1 w *40ʹنఆ w #PYͱ͍͏୯ҐͰ֤छͷ৘ใ͕෼͔Εͯ֨ೲ͞Ε͍ͯΔ w ݱࡏ)-4ͱ.1&(%"4)ͷ྆ํͰαϙʔτ͞Ε͍ͯΔ

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'SBHNFOUFE.1 w GUZQGJMFUZQF w NPPWIFBEFSEBUB w NEBUBVEJPWJEFPEBUB GUZQ NPPW NWIE USBL NEBU 7JEFP%BUB ௨ৗͷ.1 ϑΝΠϧ IPHFNQ

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'SBHNFOUFE.1 w GUZQGJMFUZQF w TJEYJOEFYPGNPPGNEBU w NPPGIFBEFSEBUB w NEBUBVEJPWJEFPEBUB GUZQ NPPW NWIE USBL NEBU NPPG NGIE USBG 7JEFP%BUB 'SBHNFOUFE.1 ॳظԽηάϝϯτ JOJUNT ηάϝϯτϑΝΠϧ NT

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'SBHNFOUFE.1 w )-4ͷ৔߹ɺ&9597&34*0/͔ Βαϙʔτ͞Ε͍ͯΔ J04Ҏ্ w &959."1ͰॳظԽηάϝϯτΛ ࢦఆ͢Δ͚ͩ w .1&(54ͷͱ͖ͱϑΥʔϚοτ͸ ͋·ΓมΘΒͳ͍ #EXTM3U #EXT-X-VERSION:4 #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:0 #EXT-X-MAP:URI=“init.mp4" #EXTINF 10.001 segment1.mp4 #EXTINF 10.001 segment2.mp4

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'SBHNFOUFE.1 w .1&(%"4)ͷ৔߹͸ݩʑαϙʔτ ͞Ε͍ͯΔ w *OJUJBMJ[BUJPO4PVSDF63-ʹॳظԽη άϝϯτΛࢦఆ͠ɺ4FHNFOU63-ʹ அยϑΝΠϧΛࢦఆ͢Δ͚ͩ ./output.mpd

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'SBHNFOUFE.1 )-4ͱ.1&(%"4)ͷڞ௨Խ IUUQTCMPHTBLBNBJDPNKQDNBGDNBGMPXMBMBUFODZMJWFIUNMΑΓ

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.FEJB4PVSDF&YUFOTJPOT w )551μ΢ϯϩʔυΛར༻ͯ͠ετϦʔϛϯά࠶ੜΛߦ͏ͨΊʹ8$ʹΑͬ ͯඪ४Խ͞Ε͍ͯΔ+BWB4DSJQUͷ"1* w ॳظԽʹඞཁͳϔομ৘ใؚ͕·Ε͍ͯΔॳظԽηάϝϯτͱ୹͍࣌ؒͰ ۠੾ΒΕͨϝσΟΞσʔλຊମؚ͕·ΕΔϝσΟΞηάϝϯτ͕ඞཁ w ͭ·Γɺ'SBHNFOUFE.1͸શͯຬ͍ͨͯ͠ΔͨΊɺͦͷ··࠶ੜ͢Δ ͜ͱ͕ग़དྷΔ

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.FEJB4PVSDF&YUFOTJPOT w +BWB4DSJQUͷϥΠϒϥϦEBTIKT΍IMTKTΛ࢖͏͜ͱʹΑΓɺࣗલͰ࣮૷ͤ ͣʹͦͷ··࠶ੜ͢Δ͜ͱ͕ग़དྷΔɻ 'SBHNFOUFE.1 GUZQ NPPW NWIE USBL NEBU NPPG NGIE USBG 7JEFP%BUB .FEJB4PVSDF&YUFOTJPOͰ௚઀࠶ੜ EBTIKTIMTKT

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$."'

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$PNNPO.FEJB"QQMJDBUJPO'PSNBU w *40*&$ w ϚχϑΣετϑΝΠϧ͸ࢦఆ͞Ε͍ͯͳ͍ͨΊɺطଘͷNV )-4 ΍ .1% %"4) ͕ͦͷ··࢖͏͜ͱ͕ग़དྷΔ w ϝσΟΞϑΥʔϚοτʹ*40#.'' 'SBHNFOUFE.1 Λ࢖͏͜ͱ͕ఆٛ ͞Ε͍ͯΔ

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$PNNPO.FEJB"QQMJDBUJPO'PSNBU w $."'Ͱ͸)551ͷ$IVOLFE5SBOTGFS&ODPEJOHΛ࢖͏ w ηάϝϯτϑΝΠϧ͕Τϯίʔμ͔Βશͯૹ৴͞ΕΔલʹɺνϟϯΫΛΫ ϥΠΞϯτଆͰ࠶ੜ͢Δ

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$PNNPO.FEJB"QQMJDBUJPO'PSNBU w $."'Ͱ͸)551ͷ$IVOLFE5SBOTGFS &ODPEJOHΛ࢖͏ w ηάϝϯτϑΝΠϧΛߋʹ෼ׂͨ͠΋ͷΛνϟ ϯΫͱݺͿ w ηάϝϯτϑΝΠϧ͕Τϯίʔμ͔Βશͯૹ ৴͞ΕΔલʹɺνϟϯΫΛΫϥΠΞϯτଆͰ ࠶ੜ͢Δ NEBU NPPG NGIE USBG 7JEFP%BUB 'SBHNFOUFE.1 ηάϝϯτϑΝΠϧ NT νϟϯΫ NTͷҰ෦ NEBU NPPG NGIE USBG 7JEFP NEBU NPPG NGIE USBG 7JEFP NEBU NPPG NGIE USBG 7JEFP

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$PNNPO.FEJB"QQMJDBUJPO'PSNBU w νϟϯΫͷେ͖͞͸ࣗ༝ͳͷͰɺΑΓ௿஗ԆΛ࣮ ݱ͍ͨ͠ͳΒখ͍͞αΠζͰ۠੾Δ͜ͱ΋Մೳ w νϟϯΫΛ࠶ੜ͢Δʹ͸ɺηάϝϯτͷμ΢ϯϩʔ υ͕׬ྃ͢Δલʹ$IVOLFE5SBOTGFSͰड͚औͬ ͨσʔλΛ࠶ੜόοϑΝʹඇಉظͰ௥Ճ͢Δඞཁ ͕͋Δ w ͦͷͨΊɺ࣮ࡍʹ࠶ੜग़དྷΔϓϨΠϠʔ͕গͳ͍ NEBU NPPG NGIE USBG 7JEFP%BUB 'SBHNFOUFE.1 ηάϝϯτϑΝΠϧ NT νϟϯΫ NTͷҰ෦ NEBU NPPG NGIE USBG 7JEFP NEBU NPPG NGIE USBG 7JEFP NEBU NPPG NGIE USBG 7JEFP