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‫ﺍﺳﺘﺎﻧﺪﺍﺭﺩ‬ ‫ﺑﻪ‬ ‫ﻧﮕﺎﻫﻲ‬MPEG-DASH
DASH in a Nutshell

‫ﺁﺗﻲ‬ ‫ﻭ‬ ‫ﻣﻮﺟﻮﺩ‬ ‫ﻭﺿﻊ‬ ‫ﺑﻪ‬ ‫ﻧﮕﺎﻫﻲ‬

‫ﻗﺮﺍﺭ‬ ‫ﺷﺮﺍﻳﻂ‬ ‫ﺍﻳﻦ‬ ‫ﺩﺭ‬ ‫ﻫﻢ‬ ‫ﺷﻤﺎ‬ ‫ﺣﺘﻤﺎ‬
‫ﺍﻳﺪ‬ ‫ﮔﺮﻓﺘﻪ‬

‫ﻣﺘﻌﺎﺭﻑ‬ ‫ﻣﺸﻜﻼﺕ‬ ‫ﺑﻪ‬ ‫ﻧﮕﺎﻫﻲ‬

‫ﻛﻨﻮﻥ‬ ‫ﺗﺎ‬ ‫ﮔﺮﻓﺘﻪ‬ ‫ﺻﻮﺭﺕ‬ ‫ﺗﻼﺷﻬﺎﻱ‬

‫ﺗﻜﻨﻮﻟﻮژﻱ‬ ‫ﺑﻪ‬ ‫ﻧﮕﺎﻫﻲ‬ ، ‫ﺍﺑﺘﺪﺍ‬Adaptive Bit Rate
‫ﺑﻪ‬ ‫ﻭﻳﺪﺋﻮ‬ ‫ﺍﺯ‬ ‫ﻣﺘﻔﺎﻭﺗﻲ‬ ‫ﻫﺎﻱ‬ ‫ﺑﻴﺖ‬ ‫ﻧﺮﺥ‬ ‫ﺑﺎﻧﺪ‬ ‫ﭘﻬﻨﺎﻱ‬ ‫ﻭﺿﻌﻴﺖ‬ ‫ﺍﺯ‬ ‫ﻫﻮﺷﻤﻨﺪ‬ ‫ﺷﻨﺎﺧﺖ‬ ‫ﺑﻪ‬ ‫ﺗﻮﺟﻪ‬ ‫ﺑﺎ‬ ‫ﺭﻭﺵ‬ ‫ﺍﻳﻦ‬ ‫ﺩﺭ‬
‫ﮔﺮﺩﺩ‬ ‫ﻣﻲ‬ ‫ﺍﺭﺍﺋﻪ‬ ‫ﻛﺎﺭﺑﺮ‬.‫ﺟﺮﻳﺎﻥ‬ ‫ﺷﺪﻥ‬ ‫ﻗﻄﻊ‬ ‫ﺍﺯ‬ ‫ﻛﻴﻔﻴﺖ‬ ‫ﺗﻐﻴﻴﺮ‬ ‫ﺑﺎ‬ ‫ﺍﻣﻜﺎﻥ‬ ‫ﺣﺪ‬ ‫ﺗﺎ‬ ‫ﻛﻨﺪ‬ ‫ﻣﻲ‬ ‫ﻛﻤﻚ‬ ‫ﺭﻭﺵ‬ ‫ﺍﻳﻦ‬
‫ﺷﻮﺩ‬ ‫ﺟﻠﻮﮔﻴﺮﻱ‬ ‫ﺗﺼﻮﻳﺮ‬ ‫ﻭ‬ ‫ﺩﺍﺩﻩ‬.

‫ﺭﻭﺵ‬ ‫ﺑﺎ‬ ‫ﻗﻴﺎﺱ‬ ‫ﺩﺭ‬ ‫ﻣﺤﺘﻮﺍ‬ ‫ﻣﻨﻔﺮﺩ‬ ‫ﻓﺎﻳﻞ‬ ‫ﻳﻚ‬ ‫ﺩﺭﻳﺎﻓﺖ‬ABR

MPEG-DASH
‫ﺑﺮﻭﺩﻛﺴﺘﺮﻫﺎ‬ ‫ﺗﻮﺳﻂ‬ ‫ﻣﺨﺎﻃﺒﺎﻥ‬ ‫ﺑﻪ‬ ‫ﻣﺤﺘﻮﺍ‬ ‫ﺗﺤﻮﻳﻞ‬ ‫ﺭﻭﺵ‬ ‫ﮔﺮﺍﻧﺘﺮﻳﻦ‬ ‫ﻭﻳﺪﺋﻮ‬ ‫ﺁﻧﻼﻳﻦ‬ ‫ﺗﺤﻮﻳﻞ‬
‫ﻣﺤﺘﻮﺍﻱ‬ ‫ﺑﻪ‬ ‫ﺯﻧﺪﻩ‬ ‫ﺩﺳﺘﻴﺎﺑﻲ‬Catch-up‫ﺍﺳﺘﺮﻳﻢ‬ ‫ﺳﺮﻭﻳﺴﻬﺎﻱ‬ ‫ﺩﻳﮕﺮ‬ ‫ﻳﺎ‬ ‫ﻭ‬Online‫ﻭﻳﺪﺋﻮﻳﻲ‬
‫ﻫﺎ‬ ‫ﺩﺳﺘﮕﺎﻩ‬ ‫ﺍﺯ‬ ‫ﺍﻱ‬ ‫ﮔﺴﺘﺮﺩﻩ‬ ‫ﺩﺍﻣﻨﻪ‬ ‫ﺗﻐﺬﻳﻪ‬ ‫ﺑﻪ‬ ‫ﻗﺎﺩﺭ‬ ‫ﻛﻪ‬ ‫ﺳﺮﻭﻳﺴﻬﺎ‬ ‫ﻭ‬ ‫ﻣﺤﺘﻮﺍ‬ ‫ﺍﺯ‬ ‫ﻣﺸﺘﺮﻙ‬ ‫ﺍﻛﻮﺳﻴﺴﺘﻢ‬ ‫ﻳﻚ‬
‫ﻣﺎﻧﻨﺪ‬PC،‫ﻫﺎ‬TV،‫ﺗﺎﭘﻬﺎ‬ ‫ﻟﭗ‬ ، ‫ﻫﺎ‬STB‫ﻫﻤﺮﺍﻩ‬ ‫ﺗﻠﻔﻦ‬ ‫ﻫﺎﻱ‬ ‫ﮔﻮﺷﻲ‬ ‫ﻭ‬ ‫ﻫﺎ‬ ‫ﺗﺒﻠﺖ‬ ، ‫ﺑﺎﺯﻱ‬ ‫ﻛﻨﺴﻮﻟﻬﺎﻱ‬ ،‫ﻫﺎ‬
DASH-MPEG
‫ﺍﺳﺖ‬ ‫ﺷﺪﻩ‬ ‫ﺩﺍﺩﻩ‬ ‫ﺗﻮﺳﻌﻪ‬ ‫ﺍﻣﺮﻱ‬ ‫ﭼﻨﻴﻦ‬ ‫ﺍﻧﺠﺎﻡ‬ ‫ﺑﺮﺍﻱ‬.

‫ﺷﺪﻥ‬ ‫ﺍﺳﺘﺎﻧﺪﺍﺭﺩ‬ ‫ﺭﻭﻧﺪ‬
‫ﺍﺳﺘﺎﻧﺪﺍﺭﺩ‬ ‫ﺫﻳﻞ‬ ‫ﺩﺭ‬ ‫ﺍﺳﺘﺎﻧﺪﺍﺭﺩ‬ ‫ﺍﻳﻦ‬MPEG‫ﺍﺳﺖ‬ ‫ﻳﺎﻓﺘﻪ‬ ‫ﺗﻮﺳﻌﻪ‬.
‫ژﺍﻧﻮﻳﻪ‬ ‫ﺩﺭ‬ ‫ﺁﻥ‬ ‫ﻧﻮﻳﺲ‬ ‫ﭘﻴﺶ‬2011‫ﻣﺎﻩ‬ ‫ﺩﺭ‬ ‫ﺁﻥ‬ ‫ﻧﻬﺎﻳﻲ‬ ‫ﻧﺴﺨﻪ‬ ‫ﻭ‬
‫ﻧﻮﺍﻣﺒﺮ‬2011‫ﺍﺳﺖ‬ ‫ﺷﺪﻩ‬ ‫ﺍﺭﺍﺋﻪ‬.
‫ﺗﻄﺎﺑﻘﻲ‬ ‫ﺑﺼﻮﺭﺕ‬ ‫ﻣﺤﺘﻮﺍ‬ ‫ﺍﺳﺘﺮﻳﻢ‬ ‫ﻛﺎﺭ‬ ‫ﺭﺍﻩ‬ ‫ﺍﻭﻟﻴﻦ‬ ‫ﺍﺳﺘﺎﻧﺪﺍﺭﺩ‬ ‫ﺍﻳﻦ‬
Adaptive)(‫ﭘﺮﻭﺗﻜﻞ‬ ‫ﺑﺮ‬ ‫ﻣﺒﺘﻨﻲ‬HTTP‫ﺍﺳﺖ‬.

‫ﺑﺮﺍﻱ‬ ‫ﻣﺤﺘﻮﺍ‬ ‫ﺗﺤﻮﻳﻞ‬ ‫ﺯﻧﺠﻴﺮﻩ‬Adaptive Streaming

‫ﻛﻼﻳﻨﺖ‬ ‫ﻭ‬ ‫ﺳﺮﻭﺭ‬ ‫ﺗﻌﺎﻣﻞ‬ ‫ﻧﺤﻮﻩ‬

‫ﻣﻄﻠﺐ‬ ‫ﺍﺻﻞ‬

‫ﺷﺎﺧﺺ‬ ‫ﻭﻳﮋﮔﻴﻬﺎﻱ‬MPEG-DASH
‫ﻭ‬ ‫ﺗﻘﺎﺿﺎ‬ ‫ﺍﺳﺎﺱ‬ ‫ﺑﺮ‬ ،‫ﺯﻧﺪﻩ‬ ‫ﺳﺮﻭﻳﺴﻬﺎﻱ‬Time shift
‫ﺷﺎﻣﻞ‬ ‫ﻣﻮﺟﻮﺩ‬ ‫ﺳﺎﺧﺘﻬﺎﻱ‬ ‫ﺯﻳﺮ‬ ‫ﺍﺯ‬ ‫ﺍﺳﺘﻔﺎﺩﻩ‬ ‫ﺑﻮﺩﻥ‬ ‫ﺭﺍﺣﺖ‬ ‫ﻭ‬ ‫ﻛﺎﺭﺁ‬:CDN , Caches, NAT
‫ﻓﺎﻳﺮﻭﺍﻝ‬ ‫ﻭ‬ ‫ﭘﺮﺍﻛﺴﻲ‬)‫ﺑﺮﺧﻼﻑ‬RTP(
‫ﻛﺎﺭﺑﺮ‬ ‫ﺗﻮﺳﻂ‬ ‫ﻛﺎﻣﻞ‬ ‫ﺑﺼﻮﺭﺕ‬ ‫ﺍﺳﺘﺮﻳﻢ‬ ‫ﺟﻠﺴﻪ‬ ‫ﻛﻨﺘﺮﻝ‬ ‫ﺍﻣﻜﺎﻥ‬
‫ﻣﻴﺎﻥ‬ ‫ﻛﺮﺩﻥ‬ ‫ﺳﻮﺋﻴﭻ‬ ‫ﺍﺯ‬ ‫ﻣﺸﻜﻞ‬ ‫ﺑﺪﻭﻥ‬ ‫ﭘﺸﺘﻴﺒﺎﻧﻲ‬Track‫ﻣﺨﺘﻠﻒ‬ ‫ﻫﺎﻱ‬
‫ﺑﺮ‬ ‫ﻣﺒﺘﻨﻲ‬ ‫ﻓﺎﻳﻞ‬ ‫ﻓﺮﻣﺖ‬ISO)MPEG2_TS(‫ﻭ‬‫ﻣﺨﺘﻠﻒ‬ ‫ﻓﺮﻣﺘﻬﺎﻱ‬ ‫ﺑﺎ‬ ‫ﻫﺎﻳﻲ‬ ‫ﺳﮕﻤﻨﺖ‬ ‫ﺍﺯ‬ ‫ﭘﺸﺘﻴﺒﺎﻧﻲ‬
، ‫ﺯﻳﺮﻧﻮﻳﺲ‬ ، ‫ﻣﺨﺘﻠﻒ‬ ‫ﻫﺎﻱ‬ ‫ﺯﺑﺎﻥ‬ ‫ﺑﻪ‬ ‫ﻧﺴﺒﺖ‬ ‫ﺗﻔﺎﻭﺕ‬ ‫ﺑﻲ‬ ‫ﻭ‬ ‫ﻛﺪﻙ‬ ‫ﺍﺯ‬ ‫ﻣﺴﺘﻘﻞ‬....
‫ﺳﺎﺯﻱ‬ ‫ﻓﺸﺮﺩﻩ‬ ‫ﺍﺳﺘﺎﻧﺪﺍﺭﺩ‬ ‫ﺍﺯ‬ ‫ﺍﺳﺘﻔﺎﺩﻩ‬H.264

‫ﻭ‬ ‫ﻭﻳﺪﺋﻮ‬ ‫ﭘﺬﻳﺮ‬ ‫ﻣﻘﻴﺎﺱ‬ ‫ﻛﺪﮔﺬﺍﺭﻱ‬ ‫ﺍﺯ‬ ‫ﭘﺸﺘﻴﺒﺎﻧﻲ‬Multiview video coding

‫ﭘﻴﭽﻴﺪﻩ‬ ‫ﺳﺮﻭﺭﻱ‬ ‫ﺗﺠﻬﻴﺰﺍﺕ‬ ‫ﺍﺯ‬ ‫ﻧﻴﺎﺯ‬ ‫ﺑﻲ‬)‫ﺳﺮﻭﺭ‬ ‫ﻭﺏ‬ ‫ﺑﺎ‬ ‫ﺍﺻﻠﻲ‬ ‫ﻧﻘﺶ‬(
‫ﺳﺮﻭﺭﻱ‬ ‫ﺗﺮﺍﻓﻴﻚ‬ ‫ﻛﺎﻫﺶ‬
‫ﻣﻲ‬ ‫ﻛﺎﺭﺗﺮ‬ ‫ﭘﺮ‬ ‫ﻛﻼﻳﻨﺖ‬‫ﺷﻮﺩ‬

MPD‫ﭼﻴﺴﺖ‬‫؟‬
MEDIA PRESENTATION DESCRIPTION
‫ﺑﺮ‬ ‫ﻣﺒﺘﻨﻲ‬ ‫ﺳﻨﺪ‬ ‫ﻳﻚ‬XML‫ﻗﻄﻌﺎﺕ‬ ‫ﻛﻨﺪ‬ ‫ﻣﻲ‬ ‫ﺗﺸﺮﻳﺢ‬ ‫ﻛﻪ‬ ‫ﺍﺳﺖ‬
‫ﻣﺨﺘﻠﻒ‬)‫ﻭ‬ ‫ﺯﻣﺎﻥ‬ ‫ﻣﺎﻧﻨﺪ‬ ‫ﻣﺨﺘﻠﻒ‬ ‫ﺟﻬﺎﺕ‬ ‫ﺍﺯ‬(....‫ﻣﺪﻳﺎﻱ‬ ‫ﻳﻚ‬ ‫ﺩﺭ‬
‫ﺩﺍﺭﻧﺪ‬ ‫ﻗﺮﺍﺭ‬ ‫ﻓﺎﻳﻞ‬ ‫ﺍﺯ‬ ‫ﻗﺴﻤﺘﻲ‬ ‫ﭼﻪ‬ ‫ﺩﺭ‬ ‫ﻣﻮﺟﻮﺩ‬.
‫ﺍﺳﺘﺎﻧﺪﺍﺭﺩ‬ ‫ﺍﺯ‬ ‫ﻗﺒﻞ‬DASH‫ﺷﺪ‬ ‫ﻣﻲ‬ ‫ﻧﺎﻣﻴﺪﻩ‬ ‫ﻣﺎﻧﻴﻔﺴﺖ‬ ‫ﻓﺎﻳﻞ‬ ‫ﺍﻳﻦ‬ ،
‫ﺍﺳﺖ‬ ‫ﺁﻧﻬﺎ‬ ‫ﻣﺨﺘﺼﺎﺕ‬ ‫ﻭ‬ ‫ﻫﺎ‬ ‫ﺳﮕﻤﻨﺖ‬ ‫ﺍﺯ‬ ‫ﺍﻳﻨﺪﻛﺲ‬ ‫ﻳﻚ‬ ‫ﻭﺍﻗﻊ‬ ‫ﺩﺭ‬ ‫ﻭ‬.

MEDIA PRESENTATION DESCRIPTION

‫ﻓﺮﻣﺖ‬ ‫ﻳﻚ‬Streaming‫ﻣﺘﺤﺪﺳﺎﺯﻱ‬ ‫ﺗﻮﺳﻂ‬ ‫ﺭﺍ‬ ‫ﺣﺼﻮﻝ‬ ‫ﻗﺎﺑﻞ‬ ‫ﻛﻴﻔﻴﺖ‬ ‫ﺣﺪﺍﻛﺜﺮ‬ ‫ﻛﻪ‬
‫ﻣﺎﻧﻨﺪ‬ ‫ﻣﺨﺘﻠﻒ‬ ‫ﺍﺧﺘﺼﺎﺻﻲ‬ ‫ﻓﻨﺎﻭﺭﻳﻬﺎﻱ‬:
oMicrosoft Smooth Streaming – Silver light
oAdobe’s HTTP Dynamic Streaming
oApple’s HLS(HTTP Live Streaming)
‫ﺭﺳﺎﻧﺪ‬ ‫ﻣﻲ‬ ‫ﺍﻧﺠﺎﻡ‬ ‫ﺑﻪ‬ ‫ﻭﺍﺣﺪ‬ ‫ﻓﺎﻳﻞ‬ ‫ﻳﻚ‬ ‫ﻭ‬ ‫ﻣﻨﻔﺮﺩ‬ ‫ﺍﺳﺘﺎﻧﺪﺍﺭﺩ‬ ‫ﻳﻚ‬ ‫ﺗﺸﻜﻴﻞ‬ ‫ﻭ‬.

‫ﻛﻼﻳﻨﺖ‬ ‫ﺳﻤﺖ‬ ‫ﺍﺗﻔﺎﻗﺎﺕ‬

‫ﻣﺘﻌﺎﺭﻑ‬ ‫ﻫﺎﻱ‬ ‫ﻛﺎﺭﺑﺮﺩ‬

ِ ‫ﺳﻤﺖ‬ ‫ﺑﻪ‬ ‫ﺣﺮﻛﺖ‬DASH
•‫ﺳﺎﻝ‬ ‫ژﺍﻧﻮﻳﻪ‬ ‫ﺍﻭﻝ‬ ‫ﺍﺯ‬ ‫ﻳﻮﺗﻴﻮﺏ‬٢٠١٣‫ﺍﺳﺖ‬ ‫ﻧﻤﻮﺩﻩ‬ ‫ﺍﺭﺍﺋﻪ‬ ‫ﭘﺎﻳﻪ‬ ‫ﺍﻳﻦ‬ ‫ﺑﺮ‬ ‫ﺭﺍ‬ ‫ﻫﺎﻳﺶ‬ ‫ﻭﻳﺪﺋﻮ‬ ‫ﺍﺯ‬ ‫ﻧﻴﻤﻲ‬

‫ﻋﺮﺻﻪ‬ ‫ﺍﻳﻦ‬ ‫ﺍﺻﻠﻲ‬ ‫ﺑﺎﺯﻳﮕﺮﺍﻥ�Ĭ

‫ﺑﻌﺪﻱ‬ ‫ﻫﺎﻱ‬ ‫ﮔﺎﻡ‬

‫ﺷﻤﺎ‬ ‫ﺗﻮﺟﻪ‬ ‫ﺍﺯ‬ ‫ﺗﺸﮑﺮ‬ ‫ﺑﺎ‬
m.h.bahreini@gmail.com

�ݺ�ߣ

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