Fizz Weekly Issue #14
睹·Reads
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Why I started learning Emacs in 2016
2016,选择Emacs的理由。
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more, less, and a story of typical Unix fossilization
Unix中
more
跟less
的故事。 -
艺术不局限于技术。
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基于Emacs的代码表演。
研·Researches
- Advanced Transport Options for the Dynamic Adaptive Streaming over HTTP 1
- 早期的HTTP协议并没有规定网络层协议,虽然现在大部分实现都是用TCP的。TCP的问题是可靠传输导致的效率低下,这对视频流播服务是致命的;近年来有些文章已经开始探索其他协议,比如说HTTP/2还有基于UDP的QUIC协议;研究表明基于TCP的视频流带宽需要达到视频码率的两倍才行;HTTP 1.1开始引入了persistent和pipeline的特性。
- Live streaming of 4K ultra-high definition video over the internet 2
- 这篇文章主要结合了HTTP/2和OpenFlow来解决延迟跟启动的问题,针对的是超高清视频直播,不过本文只有4页,只是从概念上证明了可行性,并未给出实际的实验结果。
- An HTTP/2 push-based approach for SVC adaptive streaming 3
- SVC最大的缺点是它使每一层的编码开销变多了10%,从而使得需要传输更多的比特。MUELLER et al. 首次探索了SPDY用于自适应码率流播,但是他们发现该方法的几大优势都被SPDY所强制要求的SSL以及成帧的额外开销所抵消了。Wei et al. 使用了HTTP/2,利用push特性来减小延迟,并把segment的大小从5秒减小到了1秒,最终的延迟从16秒减小到了4秒。
思·Thoughts
We escape into truisms, small talk and distractions. Given the opportunity at a family gathering to share our hopes and disappointments, we talk about the weather and watch TV.
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Timmerer, Christian, and Alan Bertoni. “Advanced Transport Options for the Dynamic Adaptive Streaming over HTTP.” arXiv preprint arXiv:1606.00264 (2016). ↩
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Petrangeli, Stefano, et al. “Live streaming of 4K ultra-high definition video over the internet.” Proceedings of the 7th International Conference on Multimedia Systems. ACM, 2016. ↩
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van der Hooft, Jeroen, et al. “An HTTP/2 push-based approach for SVC adaptive streaming.” NOMS 2016-2016 IEEE/IFIP Network Operations and Management Symposium. IEEE, 2016. ↩