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Goͱ ΦϯσϚϯυಈը ৴ج൫ @__timakin__
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• Seiji Takahashi • Github: timakin / Twitter: @__timakin__ • גࣜձࣾσΟʔɾΤψɾΤʔ • Perl / JavaScript • גࣜձࣾτϥϯεϦϛοτ • C++ (Cocos-2dx) • גࣜձࣾGunosy ৽نࣄۀ։ൃࣨ • Go / Swift ࣗݾհ
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גࣜձࣾGunosy ৽نࣄۀ։ൃࣨʹ͍ͭͯ
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Gunosyͷ5ʙ10ޙͷΛ࡞Δ͘ɺ VRARɺԻUIͳͲࠓޙීٴ͢ΔՄೳੑͷ͋Δ ৽͍͠σόΠεٕज़Λݚڀ͠ɺ ৽نαʔϏεͷ্ཱͪ͛ͳͲΛߦ͏෦ॺ
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Ϧαʔν • ւ֎ͷઌਐࣄྫͷ·ͱΊ • SDKͷެࣜDocsGithub repoͷ ίʔυΛړͬͯ࠷৽ٕज़ͷ νϡʔτϦɾԠ༻ྫΛ୳Δ • SlackʹRSS௨ɺϨϙʔτڞ༗ Δ͜ͱ
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։ൃ • ͓ன͍ͭͰʹνϡʔτϦΞϧ ϋοΧιϯ • ্ཱ͕ͪΓظ ۃྗখنνʔϜͰ Δ͜ͱ
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ྫ
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ྫ
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ษڧձ։࠵
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ຊͷΞδΣϯμ
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GoͱΦϯσϚϯυಈը৴ج൫ • ಈը৴ͱʁ • ৴·ͰͷྲྀΕ • GoΛͲ͏͏͔ • ·ͱΊ ΞδΣϯμ
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ΞδΣϯμ GoͰ࡞ΔΦϯσϚϯυಈը৴ج൫ • ಈը৴ͱʁ • ৴·ͰͷྲྀΕ • GoΛͲ͏͏͔ • ·ͱΊ
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େ͖͚ͯ͘ ̎ छྨ ಈը৴ͱʁ
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ϦΞϧλΠϜ৴ • ͍ΘΏΔϥΠϒಈը • WebSocketͷ ίωΫγϣϯͳͲΛ ௨ͯ͡ϒϩʔυΩϟετ ಈը৴ͷछྨ
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ΦϯσϚϯυ৴ • ͋Β͔͡Ί࡞͞Εͨ ಈըΛݟΔ • ಈը͕ඞཁʹͳͬͨ λΠϛϯάͰࣗ༝ʹ ࢹௌͰ͖Δ ಈը৴ͷछྨ
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GoͰ࡞ΔΦϯσϚϯυಈը৴ج൫ • ಈը৴ͱʁ • ৴·ͰͷྲྀΕ • GoΛͲ͏͏͔ • ·ͱΊ ΞδΣϯμ
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ಈը৴ʹඞཁͳ࡞ۀ Ξοϓϩʔυ ө૾ॲཧ ύοέʔδԽ ৴
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ಈը৴ʹඞཁͳ࡞ۀ Ξοϓϩʔυ ө૾ॲཧ ύοέʔδԽ ৴ ετϨʔδ ৴ऀ AWSͷS3 Bucket GCPͷCloud Storage ͳͲʹΞοϓϩʔυ
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ಈը৴ʹඞཁͳ࡞ۀ Ξοϓϩʔυ ө૾ॲཧ ύοέʔδԽ ৴ Τϯίʔμʔ ετϨʔδ ࣈນૠೖೖྗө૾ͷ ΤϯίʔσΟϯάʹՃ͑ͯɺ αϜωΠϧͷΓऔΓͳͲ
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ಈը৴ʹඞཁͳ࡞ۀ Ξοϓϩʔυ ө૾ॲཧ ύοέʔδԽ ৴ ετϨʔδ ಈըΛׂͯ͠ ޮతʹ৴Մೳͳ ϑΝΠϧΛੜ͢Δɺ ҉߸Խ͢Δ ύοέʔδϯά"1*
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ಈը৴ʹඞཁͳ࡞ۀ Ξοϓϩʔυ ө૾ॲཧ ύοέʔδԽ ৴ ৴"1*$%/ ετϨʔδ ड৴ऀ HTTPΫϥΠΞϯτʹରͯ͠ CDNΛ௨ͭͭ͠৴
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શମ૾ ετϨʔδ ৴ऀ ө૾ॲཧɺ ύοέʔδϯά ৴"1*$%/ ड৴ऀ
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GoͱΦϯσϚϯυಈը৴ج൫ • ಈը৴ͱʁ • ৴·ͰͷྲྀΕ • GoΛͲ͏͏͔ • ·ͱΊ ΞδΣϯμ
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Ξοϓϩʔυ ө૾ॲཧ ύοέʔδԽ ৴ Go͕ؔΘΔͱ͜Ζ ʁ
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Go͕ؔΘΔͱ͜Ζ ө૾ॲཧ • ఏڙը࣭ʹ߹ΘͤͨϑϨʔϜ/ϏοτϨʔτͷௐ • ϩεΛ͑ͨѹॖ ύοέʔδԽ • m3u8 + TSϑΝΠϧͷੜ • ετϨʔδͷΞοϓϩʔυ ৴ • ಈըͷJSONΛฦ͢௨ৗͷAPIػೳ • αϜωΠϧؔ࿈ಈըੜ
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Կߟ͑ͳ͍৴ mp4
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Կߟ͑ͳ͍৴ mp4 Ϋιॏ͍
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HLS৴ • HTTP Live Streaming • Apple͕iOS͚ʹ։ൃͨ͠ετϦʔϛϯάϓϩτίϧ • WindowsͳͲ࠶ੜڥ͕ݶఆ • ϫʔΫϑϩʔ • ಈըίϯςϯπͷΞοϓϩʔυ • ηάϝϯτԽ • ಉ࣌ʹαϜωΠϧੜ৴࣭ผͷੜͳͲ • IndexFile(m3u8)Λ৴ͯ͠ɺΫϥΠΞϯτ ΠϯσοΫε͞ΕͨMPEG-2 TSϑΝΠϧΛಡΈʹߦ͘
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HLSͷத segmented media files (MPEG-2 TS) Index file (m3u8)
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HLS৴ͷྲྀΕ NV )JHI NV .JE NV -PX
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؆୯ʹHLSΤϯίʔυ͢Δํ๏ ffmpeg Elastic Transcoder
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؆୯ʹHLSΤϯίʔυ͢Δํ๏ ffmpeg Elastic Transcoder
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ffmpeg • ಈըͱԻΛهɾมɾ࠶ੜ͢ΔͨΊͷϑϦʔιϑτ ΣΞ • ffmpegΛར༻ͨ͠Τϯίʔυɾσίʔυ͕Ͱ͖Δ ༻ιϑτΣΞஶ࡞ݖ৵ΛሃΉ…? https://blog.tai2.net/mpegla_and_ffmpeg.html
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ffmpeg-based API • Docker multi-stage buildͰੜ͞ΕͨimageΛݩʹɺ execܦ༝ͰffmpegΛݺͿɻ • binding࣮͔ίϚϯυͷexecuteͰݺͿ΄͔ͳ͍ɻ • ݸਓతʹGKEͰ্هimageΛݩʹͨ͠ίϯςφΛཱͯ ͯɺੜ݁ՌΛGoogle Cloud StorageʹΞοϓϩʔυ͢ ΔͳͲ͕ྑ͍ͱࢥͬͯΔɻ
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ffmpeg-based API media file Kubernetes Engine Cloud Storage goroutine
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ffmpeg encoding
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ffmpeg encoding
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Encoding command mp4ΛAACɺH.264ͰΤϯίʔυ͠ɺ 4ඵ͝ͱͷηάϝϯτʹׂͨ݁͠ՌΛอଘ͢Δίʔυɻ ಉҰσΟϨΫτϦʹm3u8ͱtsϑΝΠϧ͕ੜ͞ΕΔɻ
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Exec Commands ffmpegͷbinding࣮(goav)Λ͏ͷ͋Γɻ ͨͩɺॊೈͳΦϓγϣϯઃఆͳͲΛؑΈΔͱffmpegΛ ͦͷ··࣮ߦͨ͠ํ͕ྑ͍ɻ
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ffmpeg bindingΛΘͳ͍߹۪ʹݺͿ͔͠ͳ͍ Exec Commands
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goroutineΛར༻ͯ͠ੜ͞Εͨ ϑΝΠϧΛฒྻΞοϓϩʔυ Parallel upload
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ffmpeg-based APIͷ·ͱΊ • αʔόʔʹΠϯετʔϧ͞ΕͨffmpegΛར༻͢Δɻ • GKEͳͲΛ͍ͭͭɺDocker multi-stage buildͰੜ ͞ΕͨimageΛݩʹɺexecܦ༝ͰffmpegΛݺͿํ๏ ͋Γɻ • binding࣮ΑΓίϚϯυͷexecuteΛ͓͢͢Ίɻ
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؆୯ʹHLSΤϯίʔυ͢Δํ๏ ffmpeg Elastic Transcoder
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Elastic Transcoder • AWS্ͷϚωʔδυಈըΤϯίʔμʔ • ίϯςϯπͷ࠶ੜ࣌ؒΛϕʔεʹ՝ۚ͞ΕΔ • ੜ݁ՌS3ΦϒδΣΫτͱͯ͠อଘ͞ΕΔ
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Elastic Transcoder input bucket media file Lambda Transcoder output bucket Transcoding Pipeline
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Elastic Transcoder input bucket media file Lambda Transcoder output bucket Transcoding Pipeline
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• goͰlambdaؔΛॻ͚ΔϥΠϒϥϦ • όΠφϦͱͦΕΛݺͼग़͢index.jsΛੜͯ͠ɺ Node.jsϥϯλΠϜͰ࣮ߦ͢Δ go-apex
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Elastic Transcoder input bucket media file Lambda Transcoder output bucket Transcoding Pipeline
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S3 Observation
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Elastic Transcoder input bucket media file Lambda Transcoder output bucket Transcoding Pipeline
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Parameter Tuning
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Elastic Transcoder ·ͱΊ • go-apexʹΑΔS3ࢹͱมॲཧ • ࠷ۙLambda͕σϑΥϧτͰGoରԠ͢Δతͳൃදͨ͠ ͠ݟͨ·ͬͨΒͦͬͪʹ͠·͠ΐ͏ɻ • ϚωʔδυͰ৭ʑͬͯ͘ΕΔɺׂසͳͲͷ ύϥϝʔλʔνϡʔχϯάʹҙ͠·͠ΐ͏ɻ
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ʕ ◔ϖ◔ʔ < Thank You!!