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README.m
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# Shenzhen-Championship-A
its a simple TCP based stream-media Modeling
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 自 变 量 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% 初始缓冲峰值速率(kbps) first_initial_speed_peak %
% 端到端环回时间(ms) E2E_RTT %
% 播放阶段平均速率(kbps) play_avg_speed %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 因 变 量 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% 初始缓冲时延(ms) first_initial_delay %
% 卡顿占比 pause_percentage %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 其他变量 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% 视频全程感知速率(kbps) download_avg_speed %
% 卡顿时长(ms) pause_time %
% 播放时长(ms) play_time %
% 播放阶段总时长(ms) total_time %
% 卡顿次数 pause_number %
% 视频码率(kbps) code_speed %
% 初始缓冲下载数据量(byte) initial_data_among %
% 视频质量得分SQuality score_quality %
% 初始缓冲得分SLoading score_loading %
% 卡顿得分Sstalling score_pause %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 说 明 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% 整个视频观看过程, 包括初始缓冲阶段和播放阶段 %
% %
% 播放阶段总时长 = 卡顿时长 + 播放时长 %
% %
% 卡顿占比 = 卡顿时长 / 播放时长 %
% %
% 初始缓冲量为4s, 单位为s, 乘以视频码率得到初始缓冲阶段需要下载的数据量%
% %
% 样本数据中码率为2903 / 2934 / 2966 kbps, 波动范围较小, 可取一个中间值%
% 固定下来呈现 %
% %
% 样本数据中播放阶段总时长范围为30000 - 30100ms, 可取固定值30000ms呈现 %
% %
% 卡顿门限建议为0, 即播放阶段缓冲区没有数据时出现卡顿 %
% %
% 重播放门限建议为2.7s, 单位为s, 乘以视频码率得到相应的数据量, 表示卡顿%
% 后缓冲区下载多少数据开始重新播放 %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% MODEL 1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 思 路 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% codespeed设置为所有用户的平均值 %
% %
% totaltime 设置为30000 %
% %
% 假设用户初始下载量为4*codespeed %
% %
% 忽略各种延时 仅考虑一开始时的e2e %
% %
% 突发下载速率与平均下载速率关系为... %
% (InitialSpeedPeak - playAvgSpeed) ./ ... %
% (InitialDelay - E2ERTT) + playAvgSpeed; %
% %
% 视频开始播放后速率为 playAvgSpeed %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 存在问题 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% 部分用户仅仅下载0.2s 左右 这类用户全程感知速率大约为400以下 %
% %
% 初始等待时间较实际时间差距较大，大约相差一倍产生这种情况的原因是突发 %
% 下载速率与平均下载速率关系与实际差距较大，可以考虑减慢衰减速率 %
% %
% 卡顿时间预测与实际符合较好。 %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%