Go and on-demand video streaming / Goとオンデマンド動画配信

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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 ࣗݾ঺հ

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גࣜձࣾGunosy ৽نࣄۀ։ൃࣨʹ͍ͭͯ

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Gunosyͷ5ʙ10೥ޙͷ੒௕Λ࡞Δ΂͘ɺ VR΍ARɺԻ੠UIͳͲࠓޙීٴ͢ΔՄೳੑͷ͋Δ  ৽͍͠σόΠε΍ٕज़Λݚڀ͠ɺ  ৽نαʔϏεͷ্ཱͪ͛ͳͲΛߦ͏෦ॺ

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Ϧαʔν • ւ֎ͷઌਐࣄྫͷ·ͱΊ • SDKͷެࣜDocs΍Github repoͷ  ίʔυΛړͬͯ࠷৽ٕज़ͷ  νϡʔτϦɾԠ༻ྫΛ୳Δ • SlackʹRSS௨஌ɺϨϙʔτڞ༗ ΍Δ͜ͱ

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։ൃ • ͓ன͍ͭͰʹνϡʔτϦΞϧ  ϋοΧιϯ • ্ཱ͕ͪΓظ͸  ۃྗখن໛νʔϜͰ ΍Δ͜ͱ

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ྫ

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ྫ

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ษڧձ։࠵

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ຊ೔ͷΞδΣϯμ

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GoͱΦϯσϚϯυಈը഑৴ج൫ • ಈը഑৴ͱ͸ʁ • ഑৴·ͰͷྲྀΕ • GoΛͲ͏࢖͏͔ • ·ͱΊ ΞδΣϯμ

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ΞδΣϯμ GoͰ࡞ΔΦϯσϚϯυಈը഑৴ج൫ • ಈը഑৴ͱ͸ʁ • ഑৴·ͰͷྲྀΕ • GoΛͲ͏࢖͏͔ • ·ͱΊ

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େ͖͘෼͚ͯ ̎ छྨ ಈը഑৴ͱ͸ʁ

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ϦΞϧλΠϜ഑৴ • ͍ΘΏΔϥΠϒಈը • WebSocketͷ  ίωΫγϣϯͳͲΛ  ௨ͯ͡ϒϩʔυΩϟετ ಈը഑৴ͷछྨ

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ΦϯσϚϯυ഑৴ • ͋Β͔͡Ί࡞੒͞Εͨ  ಈըΛݟΔ • ಈը͕ඞཁʹͳͬͨ  λΠϛϯάͰࣗ༝ʹ  ࢹௌͰ͖Δ ಈը഑৴ͷछྨ

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GoͰ࡞ΔΦϯσϚϯυಈը഑৴ج൫ • ಈը഑৴ͱ͸ʁ • ഑৴·ͰͷྲྀΕ • GoΛͲ͏࢖͏͔ • ·ͱΊ ΞδΣϯμ

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ಈը഑৴ʹඞཁͳ࡞ۀ Ξοϓϩʔυ ө૾ॲཧ ύοέʔδԽ ഑৴

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ಈը഑৴ʹඞཁͳ࡞ۀ Ξοϓϩʔυ ө૾ॲཧ ύοέʔδԽ ഑৴ ετϨʔδ ഑৴ऀ AWSͷS3 Bucket΍  GCPͷCloud Storage  ͳͲʹΞοϓϩʔυ

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ಈը഑৴ʹඞཁͳ࡞ۀ Ξοϓϩʔυ ө૾ॲཧ ύοέʔδԽ ഑৴ Τϯίʔμʔ ετϨʔδ ࣈນૠೖ΍ೖྗө૾ͷ  ΤϯίʔσΟϯάʹՃ͑ͯɺ αϜωΠϧͷ੾ΓऔΓͳͲ

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ಈը഑৴ʹඞཁͳ࡞ۀ Ξοϓϩʔυ ө૾ॲཧ ύοέʔδԽ ഑৴ ετϨʔδ ಈըΛ෼ׂͯ͠  ޮ཰తʹ഑৴Մೳͳ  ϑΝΠϧΛੜ੒͢Δɺ  ҉߸Խ͢Δ ύοέʔδϯά"1*

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ಈը഑৴ʹඞཁͳ࡞ۀ Ξοϓϩʔυ ө૾ॲཧ ύοέʔδԽ ഑৴ ഑৴"1*$%/ ετϨʔδ ड৴ऀ HTTPΫϥΠΞϯτʹରͯ͠ CDNΛ௨ͭͭ͠഑৴

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શମ૾ ετϨʔδ ഑৴ऀ ө૾ॲཧɺ  ύοέʔδϯά ഑৴"1*$%/ ड৴ऀ

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GoͱΦϯσϚϯυಈը഑৴ج൫ • ಈը഑৴ͱ͸ʁ • ഑৴·ͰͷྲྀΕ • GoΛͲ͏࢖͏͔ • ·ͱΊ ΞδΣϯμ

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Ξοϓϩʔυ ө૾ॲཧ ύοέʔδԽ ഑৴ Go͕ؔΘΔͱ͜Ζ ʁ

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Go͕ؔΘΔͱ͜Ζ ө૾ॲཧ • ఏڙը࣭ʹ߹ΘͤͨϑϨʔϜ/ϏοτϨʔτͷௐ੔ • ϩεΛ཈͑ͨѹॖ ύοέʔδԽ • m3u8 + TSϑΝΠϧͷੜ੒ • ετϨʔδ΁ͷΞοϓϩʔυ ഑৴ • ಈըͷJSONΛฦ͢௨ৗͷAPIػೳ • αϜωΠϧ΍ؔ࿈ಈըੜ੒

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Կ΋ߟ͑ͳ͍഑৴ mp4

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Կ΋ߟ͑ͳ͍഑৴ mp4 Ϋιॏ͍

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HLS഑৴ • HTTP Live Streaming • Apple͕iOS޲͚ʹ։ൃͨ͠ετϦʔϛϯάϓϩτίϧ • WindowsͳͲ͸࠶ੜ؀ڥ͕ݶఆ • ϫʔΫϑϩʔ • ಈըίϯςϯπͷΞοϓϩʔυ • ηάϝϯτԽ • ಉ࣌ʹαϜωΠϧੜ੒΍഑৴඼࣭ผͷੜ੒ͳͲ΋ • IndexFile(m3u8)Λ഑৴ͯ͠ɺΫϥΠΞϯτ͸  ΠϯσοΫε͞ΕͨMPEG-2 TSϑΝΠϧΛಡΈʹߦ͘

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HLSͷத਎ segmented media ﬁles (MPEG-2 TS) Index ﬁle (m3u8)

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HLS഑৴ͷྲྀΕ 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 • ಈըͱԻ੠Λه࿥ɾม׵ɾ࠶ੜ͢ΔͨΊͷϑϦʔιϑτ ΢ΣΞ • ffmpegΛར༻ͨ͠Τϯίʔυɾσίʔυ͕Ͱ͖Δ  ঎༻ιϑτ΢ΣΞ͸ஶ࡞ݖ৵֐໰୊ΛሃΉ…?  https://blog.tai2.net/mpegla_and_ffmpeg.html

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ffmpeg-based API • Docker multi-stage buildͰੜ੒͞ΕͨimageΛݩʹɺ execܦ༝ͰffmpegΛݺͿɻ • binding࣮૷͔ίϚϯυͷexecuteͰݺͿ΄͔ͳ͍ɻ • ݸਓతʹ͸GKEͰ্هimageΛݩʹͨ͠ίϯςφΛཱͯ ͯɺੜ੒݁ՌΛGoogle 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 4ඵ͝ͱͷηάϝϯτʹ෼ׂͨ݁͠ՌΛอଘ͢Δίʔυɻ ಉҰσΟϨΫτϦʹm3u8ͱtsϑΝΠϧ͕ੜ੒͞ΕΔɻ

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Exec Commands ffmpegͷbinding࣮૷(goav)Λ࢖͏ͷ΋͋Γɻ ͨͩɺॊೈͳΦϓγϣϯઃఆͳͲΛؑΈΔͱffmpegΛ  ͦͷ··࣮ߦͨ͠ํ͕ྑ͍ɻ

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ffmpeg bindingΛ࢖Θͳ͍৔߹͸۪௚ʹݺͿ͔͠ͳ͍ Exec Commands

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goroutineΛར༻ͯ͠ੜ੒͞Εͨ ϑΝΠϧΛฒྻΞοϓϩʔυ Parallel upload

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ffmpeg-based APIͷ·ͱΊ • αʔόʔʹΠϯετʔϧ͞ΕͨffmpegΛར༻͢Δɻ • GKEͳͲΛ࢖͍ͭͭɺDocker multi-stage buildͰੜ੒ ͞ΕͨimageΛݩʹɺexecܦ༝ͰffmpegΛݺͿํ๏΋  ͋Γɻ • binding࣮૷ΑΓ͸ίϚϯυͷexecuteΛ͓͢͢Ίɻ

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؆୯ʹHLSΤϯίʔυ͢Δํ๏ ffmpeg Elastic Transcoder

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Elastic Transcoder • AWS্ͷϚωʔδυಈըΤϯίʔμʔ • ίϯςϯπͷ࠶ੜ࣌ؒΛϕʔεʹ՝ۚ͞ΕΔ • ੜ੒݁Ռ͸S3ΦϒδΣΫτͱͯ͠อଘ͞ΕΔ

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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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No content

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• goͰlambdaؔ਺Λॻ͚ΔϥΠϒϥϦ • όΠφϦͱͦΕΛݺͼग़͢index.jsΛੜ੒ͯ͠ɺ  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-apexʹΑΔS3؂ࢹͱม׵ॲཧ • ࠷ۙLambda͕σϑΥϧτͰGoରԠ͢Δతͳൃදͨ͠ ͠஌ݟͨ·ͬͨΒͦͬͪʹ͠·͠ΐ͏ɻ • ϚωʔδυͰ৭ʑ΍ͬͯ͘ΕΔ෼ɺ෼ׂස౓ͳͲͷ  ύϥϝʔλʔνϡʔχϯάʹ஫ҙ͠·͠ΐ͏ɻ

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ʕ ◔ϖ◔ʔ < Thank You!!