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FPS Resolution Bitrate Settings Effect on Throughput in the Adobe Flash Media Live Encoder Software
This is an English translated of my assignment from undergraduate course regarding research writing where the point is taught that research writing consists mostly of Abstracts, Introduction, Literature Reviews, Research Methods, Discussion, Conclusion, and Bibliography. Even though this course teaches in more detail about the contents of each chapter, at that time I was not able to fully reflect the details in this assignment.
Logically, the resolution and fps settings in the streaming video should have an effect on the amount of throughput. But in the Adobe Flash Media Live Encoder software there is a bitrate setting, this is what affects the amount of throughput. Resolution and fps (frames per second) seem to have an effect on bitrate. This research is proof that the statement is true. In the future, besides knowing the throughput generated from various settings in the Adobe Flash Media Live Encoder software, the appropriate settings will be obtained.
This study uses two computers connected to the same network. The first computer does video steaming over the second computer, which measures the throughput produced by the first computer. The software used to measure throughput is Wireshark. Throughput measurements are carried out at various resolutions, fps (frames per second), and bitrate. Then the average throughput of the various resolutions, fps, and bitrates will be compared.
From the research results, it is proven that the average throughput produced is in accordance with the bitrate setting. There was no visible impact from the resolution and fps settings.
Video quality such as image pixel size and fps (frames per second) affects throughput. The bigger the image pixel, the bigger the data frame sent. Likewise with fps. A web cam has been installed in the Computer Lab, Department of Electrical Engineering, Udayana University. Installation of a web cam to show lab activities via the web. In fact, the resulting throughput with various settings for fps (frames per second), resolution and bitrate is not known. In this study, the resulting throughput will be observed with various settings for fps (frames per second), resolution, and bitrate using the Wireshark software.
Throughput is the amount of data sent divided by the time required for large data to arrive at its destination in 1-way communication. Throughput is measured in bits / second or bytes / second (Gómez, 2005).
Applications such as VOIP (voice over IP) and video are sensitive to delay and jitter. Delay is the time it takes for a packet to be sent from origin to destination. Jitter is a variation of delay. Applications like this require a small delay (approx. 150 milliseconds). Therefore throughput must be guaranteed from origin to destination (Farrel, 2009).
RTP is a transport protocol for real-time applications. Real-time applications include audio and video conferencing, live video distribution, shared workspaces, remote medical diagnosis, telephony, command and control systems, distributed interactive simulations, games, and real-time monitoring.
With the development of high speed LAN (Local Area Network) and WAN (Wide Area Network) it is possible for real-time based applications to run on IP (Internet Protocol) based networks. The thing that is generally considered in real-time based applications is timing. Where the timing of receiving the package must match the timing of the package delivery. Therefore delay and throughput are common measures of quality (Stallings, 1998).
Figure 2.1 RTP header (Stallings, 1998)
Figure 2.2 Traffic in Realtime protocol (Stallings, 1998)
Is a media encoder software that can capture audio and video as well as stream video and audio to Adobe Media Server or Flash Video Streaming Service (FVSS) in real-time. This software is able to broadcast live activities such as sports, concerts and others. (Adobe, 2013).
Wireshark is a world-renowned network protocol analyzer software. Can also capture traffic on a computer network. This software is the de facto (and often said de jure) standard from various industries and educational institutions. Wireshark was developed by many networking experts around the world and is an ongoing project from 1998 (Combs, 2013).
Second, start the packet capture with the Wireshark software on the laptop. The captured packet is on the wireless LAN.
Figure 3.2 Selection of wlan0 interface for captured packets
Packet capture is filtered so that it only captures packets sent by streaming video, namely 192.168.0.2.
Figure 3.3 Entering the filter command ip.src == 192.168.0.2
To see the throughput, the statistics menu is selected then IO graph is selected.
Figure 3.4 Selection of IO Graph
As with packet capture, it is filtered to see only bits passing from 192.168.0.2.
Figure 3.5 Graph of the throughput of 192.168.0.2
Third, start streaming the video with the Adobe Flash Media Live Encoder software with the settings adjusted to the problem statement.
Figure 3.6 Video streaming settings on the Adobe Flash Media Live Encoder
Fourth, after 2 minutes the streaming is stopped. Sixth, packet capture on Wireshark is stopped and the results are saved. Seventh, return to the second step with the third step of a different arrangement (proceeding from the problem formulation). If all settings have been tried then the data search is complete.
From the experimental results, it is evident that the average throughput is fully influenced by the bitrate setting. Even though the resolution settings are 160x120, 320x240 and fps 1, 5, 10, if the bitrate is set to 100Kbps then the average throughput is 100Kbps, the bitrate setting is 350Kbps, the average throughput is 350Kbps, the bitrate setting is 500Kbps then the average throughput is 500Kbps and so on.
Although the average throughput is the same as the resulting graphics bitrate setting varies with different resolution and fps settings. From this study, the real resolution and fps were not observed. Delay, jitter, or parameters other than throughput are not examined in this article. These things can be used as further research from this research. The software being researched was the Adobe Flash Media Live Encoder, so it could do research again using other software.