roman10
From the monthly archives: September 2011
Ping is a simple but powerful tool to test if a host can reach another host in the network, and measure the RTT (round trip time). It works by sending ICMP (Internet Control Message Protocol) echo request packets to destination host and wait for the response.
This post covers how to use ping to [...]
It has been a week since I left my last job, a startup company working on video broadcast/streaming product solution.
I joined the company as the first full-time employee in Oct 18 2010 and left at 16 Sep 2011. The 11-month journey is full of experience of all sorts, exciting, depressed, joy, sad, working [...]
This is the third method of the http video delivery. Unlike the first two methods: HTTP Progressive Download and Play, and HTTP Pseudo-streaming, this is a real streaming technology and it’s applicable for both live video and video on demand (VOD).
The basic idea of Dynamic Adaptive Streaming over HTTP (DASH) is [...]
IPerf is a tool that allows one to measure the throughput between two hosts in the network. It works for both UDP and TCP traffic.
To measure the throughput, one needs to set up an IPerf running in server mode in the server host and another IPerf running in client mode at the other [...]
HTTP Pseudo Streaming is the second method in HTTP Video Delivery. The method is also based on HTTP progressive download as the first method does, and it makes use of the partial download functionality of HTTP to allow user to seek the video to part that has not been downloaded yet.
HTTP Pseudo [...]
Progressive Download and Play is the first of the three methods in HTTP Video Delivery. The basic idea of this method is to embed the video through media player (e.g. JWPlayer, FlowPlayer etc.). When user request to play the video, a HTTP Get request will send to the web server, and the video will [...]
1. TCP Congestion Control and Window Size
TCP maintains a congestion window, which indicates the number of packets that TCP can send before an acknowledge for the first packet sent is received.
The congestion window size is default to 2 times of the maximum segment size (MSS, the largest amount of data in bytes [...]
JWPlayer and FlowPlayer are video players that support Flash video. What confusing is they’re referred as Flash Video Players sometimes. (e.g. FlowPlayer claims itself as Flash Video Player for the Web.) Why do I need another Flash Video Player if I already have Adobe Flash Player installed?
Adobe Flash Player is actually a virtual machine [...]
It was friday afternoon. I was still busy debugging. The bug has been bothering me for 2 days. Then a colleage proposed another method, that saved my day and made me laugh at myself.
Let me start from the beginning. Our software has a web-based UI which is only available at client side which [...]
As Internet becomes faster and faster, videos become important content of many websites. There’re many methods to publish video on Internet. This blog focuses on technologies around HTTP.
There’re 3 ways to deliver video content in HTTP, progressive download and play, HTTP Pseudostreaming, and Dynamic Adaptive Streaming over HTTP.
0. Why HTTP?
When [...]
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