GOP-level parallelization of the H.264 decoder without a start-code scanner

Recent researches on parallelization of H.264 video decoders focused on fine-grain methods. These works led to designs having very short latencies and good memory usage. However, they could not reach the scalability of Group of Pictures (GOP) level approaches although assuming a well-designed entrop...

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Published in:2010 2nd International Conference on Signal Processing Systems Vol. 3; pp. V3-627 - V3-630
Main Authors: Gurhanli, Ahmet, Chen, Charlie Chung-Ping, Shih-Hao Hung
Format: Conference Proceeding
Language:English
Published: IEEE 01.07.2010
Subjects:
Decoding
Entropy
H.264 Decoder
High-Performance Computing
Image/Video Processing and Coding
Magnetic cores
Parallel and Distributed Processing
Parallel processing
Program processors
Scalability
Streaming media
Video Compression
ISBN:9781424468928, 1424468922
Online Access:Get full text
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Abstract Recent researches on parallelization of H.264 video decoders focused on fine-grain methods. These works led to designs having very short latencies and good memory usage. However, they could not reach the scalability of Group of Pictures (GOP) level approaches although assuming a well-designed entropy decoder which can feed the increasing number of parallel working cores. We would like to introduce a GOP-level approach due to its high scalability, mentioning solution approaches for the well-known latency and memory issues. Our design revokes the need to a scanner for GOP startcodes which was used in the earlier methods. This approach lets all the cores work on the decoding task. Although the performance on shared memory systems is subject to improve, we have observed a one-to-one linear speedup in parallel working nodes. We have tested our method using a cluster of 5 machines each having 2 processors with 4 cores. The decoding is 5 times faster when we run only one process in each machine, that is we saw one-to-one linear speedup when there is no memory shortage. We observed a maximum of 11 times speedup when using all of the 40 cores distributed among 5 machines.
AbstractList Recent researches on parallelization of H.264 video decoders focused on fine-grain methods. These works led to designs having very short latencies and good memory usage. However, they could not reach the scalability of Group of Pictures (GOP) level approaches although assuming a well-designed entropy decoder which can feed the increasing number of parallel working cores. We would like to introduce a GOP-level approach due to its high scalability, mentioning solution approaches for the well-known latency and memory issues. Our design revokes the need to a scanner for GOP startcodes which was used in the earlier methods. This approach lets all the cores work on the decoding task. Although the performance on shared memory systems is subject to improve, we have observed a one-to-one linear speedup in parallel working nodes. We have tested our method using a cluster of 5 machines each having 2 processors with 4 cores. The decoding is 5 times faster when we run only one process in each machine, that is we saw one-to-one linear speedup when there is no memory shortage. We observed a maximum of 11 times speedup when using all of the 40 cores distributed among 5 machines.
Author Shih-Hao Hung
Gurhanli, Ahmet
Chen, Charlie Chung-Ping
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  givenname: Ahmet
  surname: Gurhanli
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  givenname: Charlie Chung-Ping
  surname: Chen
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  organization: Grad. Inst. of Electron. Eng., Nat. Taiwan Univ., Taipei, Taiwan
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  surname: Shih-Hao Hung
  fullname: Shih-Hao Hung
  email: hungsh@csie.ntu.edu.tw
  organization: Grad. Inst. of Networking & Multimedia, Nat. Taiwan Univ., Taipei, Taiwan
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Snippet Recent researches on parallelization of H.264 video decoders focused on fine-grain methods. These works led to designs having very short latencies and good...
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SubjectTerms Decoding
Entropy
H.264 Decoder
High-Performance Computing
Image/Video Processing and Coding
Magnetic cores
Parallel and Distributed Processing
Parallel processing
Program processors
Scalability
Streaming media
Video Compression
Title GOP-level parallelization of the H.264 decoder without a start-code scanner
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Volume 3
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