Filter 是否为live source筛选器创建媒体样本时间戳？

我正在尝试用directshow编写一个UDP流应用程序，它打算在LAN环境中工作。结果一切都很好，直到客户在寻找客户时开始遇到冻结问题

以下是我所做的：

服务器

客户端

在服务器端，我有两个转换过滤器，一个用于视频，一个用于音频。在这两个过滤器中，每个过滤器都创建一个线程，该线程读取MediaSamples并在不修改时间戳/标志的情况下执行多播。同时，视频变换滤波器只是将媒体样本传递给解码器。音频变换过滤器也会这样做

在客户端。live source筛选器仅从UDP端口读取视频和音频媒体样本。在这里，我执行一些简单的时间戳计算，即：

MediaSample开始时间=当前流时间+40毫秒

这些视频在局域网环境下可以正常播放。然而，我发现当我进行搜索时，客户端会冻结片刻。当我检查渲染器时，它会显示许多帧被删除。我猜时间戳会导致帧丢失

我还注意到，每当执行搜索时，初始帧通常都会有负数戳记。如果我不将这些帧发送到客户端，客户端将不会冻结。但有些框架会被打破。我猜这是因为这些负帧是导致搜索位置的关键帧。如果它们丢失，图像将被破坏

在做了一些研究之后，我尝试了这种方法：

将第一个样本的时间戳设置为当前流时间

T1=流时间

使用第一个样本的时间戳作为基线

基数=T1

之后的每个样品计算如下：

Tn=流时间+Tn-基准

这也没用。我猜这是因为服务器和客户端的时钟不同步。但是，我认为它可能会起作用，因为在服务器端的每次搜索之后，时间戳又从0开始

我在想下一步该怎么办。 如果有人能给我一些建议，我将不胜感激

2013-07-26更新

罗曼，谢谢你的帮助。我已尝试使用中提到的方法重新设置时间戳的基础

客户端通过检查IMediaSample:：IsDiscontinuity来检测不连续性

如果出现不连续，将基线设置为接收到的时间戳

然后将每个时间戳计算为

TS-接收时间戳TC-计算时间戳

  TC = Current Stream Time + TS - B + 40ms

其中，我使用CRefTime和StreamTime（）获取当前流时间

在进行上述更改后，当我开始流式传输时，客户端的视频会缓慢移动一段时间，最终冻结。在我停止服务器发送数据后，客户端的屏幕会再次激活约半秒钟

我做错了什么？是关于时钟频率的吗

2013-08-01更新

根据Roman的建议，我能够通过在SourceFilter之后添加一个直通过滤器来发现时间戳中的错误，该过滤器允许我检查来自SourceFilter的视频输出引脚的时间戳

然而，现在我在寻找时遇到了另一个问题。在客户端，即使所有帧都正确显示，在开始更新新帧之前，它也会遭受巨大的延迟

我已经检查了这些帧，它们是导致我搜索位置帧的预滚帧。我通过在媒体示例中将preroll标志设置为false并让其播放来确认这一点。图形似乎在客户端以正常速率处理这些预滚帧，但在服务器端，这些预滚帧的处理速度要快得多

有没有办法避开这一延误，或者这只是我必须处理的事情

这些是我在直通过滤器中捕获的样本

服务器

6848 : GetState 2
31772 : 11210a90 BeginFlush
31784 : 11210a90 EndFlush
31784 : NewSegment: 38700000..300900000 at 1x
31814 : GetState 1
31814 : GetState 1
31814 : GetState 1
31815 : GetState 1
31815 : GetState 1
31816 : 11210a90 Sample 4515 bytesD time -3870.0 to -3837.0 latency 0.0 <-- Preroll Starts
31828 : 11210a90 Sample 62335 bytes time -3837.0 to -3804.0 latency 0.0
31834 : GetState 1
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31844 : GetState 1
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31864 : GetState 1
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31874 : GetState 1
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31888 : GetState 1
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31906 : GetState 1
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31926 : GetState 1
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31936 : GetState 1
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31951 : GetState 1
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31967 : GetState 1
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31982 : GetState 1
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31998 : GetState 1
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32016 : GetState 1
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32076 : GetState 1
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32096 : GetState 1
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32116 : GetState 1
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32154 : GetState 1
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32217 : GetState 1
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32237 : GetState 1
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32267 : GetState 1
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32287 : GetState 1
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32311 : GetState 1
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32443 : GetState 1
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32488 : GetState 1
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32498 : GetState 1
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32564 : GetState 1
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32668 : GetState 1
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32748 : GetState 1
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32793 : GetState 1
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32813 : GetState 1
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32827 : GetState 1
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32846 : GetState 1
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32860 : GetState 1
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32877 : GetState 1
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32903 : GetState 1
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32954 : GetState 1
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32986 : GetState 1
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33027 : GetState 1
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33047 : GetState 1
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33066 : GetState 1
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33075 : GetState 1
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33091 : GetState 1
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33109 : GetState 1
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33129 : GetState 1
33139 : GetState 1
33140 : 11210a90 Sample 37931 bytes time -300.0 to -267.0 latency 0.0
33152 : GetState 1
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33172 : GetState 1
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33184 : GetState 1
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33204 : GetState 1
33210 : 11210a90 Sample 39973 bytes time -100.0 to -67.0 latency 0.0
33216 : GetState 1
33222 : 11210a90 Sample 38835 bytes time -67.0 to -33.0 latency 0.0
33230 : GetState 1
33234 : 11210a90 Sample 43513 bytes time -33.0 to 0.0 latency 0.0
33246 : 11210a90 Sample 39879 bytes time 0.0 to 1.0 latency 0.0 <-- Preroll ends
33250 : GetState 1
33262 : GetState 1
33262 : 11210a90 Run STO 23440168ms ST 0ms
33262 : 11210a90 Sample 40240 bytes time 33.0 to 34.0 latency 33.0
33302 : 11210a90 Sample 40200 bytes time 67.0 to 68.0 latency 42.204
33337 : 11210a90 Sample 40430 bytes time 100.0 to 101.0 latency 41.204
33464 : 11210a90 Sample 40407 bytes time 134.0 to 135.0 latency 37.8390
33497 : 11210a90 Sample 43949 bytes time 167.0 to 168.0 latency 36.8390
33531 : 11210a90 Sample 40345 bytes time 200.0 to 201.0 latency 35.8390
33559 : 11210a90 Sample 40497 bytes time 234.0 to 235.0 latency 41.6530
33600 : 11210a90 Sample 40504 bytes time 267.0 to 268.0 latency 33.7936
33626 : 11210a90 Sample 114853 bytes time 300.0 to 301.0 latency 40.7936
33658 : 11210a90 Sample 20719 bytes time 334.0 to 335.0 latency 42.7936

6848:getstate2
31772:11210a90
31784:11210a90端齐平
31784:新分段：38700000..300900000在1x处
31814:GetState 1
31814:GetState 1
31814:GetState 1
31815:GetState 1
31815:GetState 1
31816:11210a90示例4515字节的时间-3870.0到-3837.0延迟0.0Seek涉及暂停和重新启动流：时间戳中存在不连续性。您要么必须在发送端自动重新计算时间戳以恢复连续性，要么在客户端检测到这一点并在那里重新设置时间戳的基础。或者，另一种选择是，客户端将刷新队列并从新开始继续。
我已经编辑了问题，以显示重新设置时间戳的方式。这样做对吗？非常感谢！我想说的是，你更愿意打印一系列的时间戳，实际上是从源过滤器中传递出来的。你很可能会看到你在传递一些奇怪的东西。你是对的！我早该这么做的。我在SourceFilter之后插入了一个GDCL监视器过滤器，发现时间戳在跳跃。修好后，我能正确地看到所有的框架。然而，现在我面临的问题是，在每次搜索之后，客户端都会有巨大的延迟。这比服务器端的缓冲时间要长得多。可能是什么问题？
31372 : GetState 2
32794 : f622d30 Sample 4515 bytesD time 30199.0 to 30232.0 latency -52.0 <---Discontinuity
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34528 : f622d30 Sample 37019 bytes time 31934.0 to 31967.0 latency -51.0
34569 : f622d30 Sample 37277 bytes time 31967.0 to 32000.0 latency -59.0
34600 : f622d30 Sample 36698 bytes time 32000.0 to 32034.0 latency -56.0
34626 : f622d30 Sample 36436 bytes time 32034.0 to 32067.0 latency -48.0
34651 : f622d30 Sample 37650 bytes time 32067.0 to 32100.0 latency -41.0
34670 : f622d30 Sample 38623 bytes time 32100.0 to 32134.0 latency -26.0
34689 : f622d30 Sample 38525 bytes time 32134.0 to 32167.0 latency -12.0
34723 : f622d30 Sample 38196 bytes time 32167.0 to 32201.0 latency -12.0
34749 : f622d30 Sample 38130 bytes time 32201.0 to 32234.0 latency -5.0
34771 : f622d30 Sample 39116 bytes time 32234.0 to 32267.0 latency 7.0
34791 : f622d30 Sample 45008 bytes time 32267.0 to 32301.0 latency 19.0
34818 : f622d30 Sample 40588 bytes time 32301.0 to 32334.0 latency 27.0
34848 : f622d30 Sample 40633 bytes time 32334.0 to 32367.0 latency 29.0
34948 : f622d30 Sample 41867 bytes time 32367.0 to 32401.0 latency -37.0
34970 : f622d30 Sample 40974 bytes time 32401.0 to 32434.0 latency -26.0
34999 : f622d30 Sample 41854 bytes time 32434.0 to 32467.0 latency -22.0
35018 : f622d30 Sample 42312 bytes time 32467.0 to 32501.0 latency -8.0
35050 : f622d30 Sample 42155 bytes time 32501.0 to 32534.0 latency -6.0
35078 : f622d30 Sample 41618 bytes time 32534.0 to 32568.0 latency -1.0
35102 : f622d30 Sample 41394 bytes time 32568.0 to 32601.0 latency 9.0
35122 : f622d30 Sample 41221 bytes time 32601.0 to 32634.0 latency 22.0
35148 : f622d30 Sample 41515 bytes time 32634.0 to 32668.0 latency 29.0
35166 : f622d30 Sample 41570 bytes time 32668.0 to 32701.0 latency 45.0
35198 : f622d30 Sample 43045 bytes time 32701.0 to 32734.0 latency 47.0
35216 : f622d30 Sample 42187 bytes time 32734.0 to 32768.0 latency 61.0
35239 : f622d30 Sample 41181 bytes time 32768.0 to 32801.0 latency 72.0
35274 : f622d30 Sample 41675 bytes time 32801.0 to 32834.0 latency 70.0
35301 : f622d30 Sample 42541 bytes time 32834.0 to 32868.0 latency 76.0
35319 : f622d30 Sample 41916 bytes time 32868.0 to 32901.0 latency 92.0
35370 : f622d30 Sample 40903 bytes time 32901.0 to 32935.0 latency 75.0
35395 : f622d30 Sample 41798 bytes time 32935.0 to 32968.0 latency 84.0
35415 : f622d30 Sample 41537 bytes time 32968.0 to 33001.0 latency 97.0
35437 : f622d30 Sample 40623 bytes time 33001.0 to 33035.0 latency 107.0
35461 : f622d30 Sample 40275 bytes time 33035.0 to 33068.0 latency 117.0
35482 : f622d30 Sample 37519 bytes time 33068.0 to 33101.0 latency 129.0
35518 : f622d30 Sample 37575 bytes time 33101.0 to 33135.0 latency 126.0
35537 : f622d30 Sample 38719 bytes time 33135.0 to 33168.0 latency 142.0
35559 : f622d30 Sample 36653 bytes time 33168.0 to 33202.0 latency 152.0
35576 : f622d30 Sample 36593 bytes time 33202.0 to 33235.0 latency 170.0
35607 : f622d30 Sample 35818 bytes time 33235.0 to 33268.0 latency 171.0
35698 : f622d30 Sample 36516 bytes time 33268.0 to 33302.0 latency 113.0
35724 : f622d30 Sample 35436 bytes time 33302.0 to 33335.0 latency 122.0
35750 : f622d30 Sample 36906 bytes time 33335.0 to 33368.0 latency 128.0
35769 : f622d30 Sample 37786 bytes time 33368.0 to 33402.0 latency 143.0
35796 : f622d30 Sample 36125 bytes time 33402.0 to 33435.0 latency 149.0
35827 : f622d30 Sample 36410 bytes time 33435.0 to 33468.0 latency 151.0
35852 : f622d30 Sample 36077 bytes time 33468.0 to 33502.0 latency 159.0
35871 : f622d30 Sample 37942 bytes time 33502.0 to 33535.0 latency 175.0
35896 : f622d30 Sample 36691 bytes time 33535.0 to 33569.0 latency 182.0
35926 : f622d30 Sample 36991 bytes time 33569.0 to 33602.0 latency 186.0
35949 : f622d30 Sample 37085 bytes time 33602.0 to 33635.0 latency 196.0
35971 : f622d30 Sample 36362 bytes time 33635.0 to 33669.0 latency 207.0
35989 : f622d30 Sample 36669 bytes time 33669.0 to 33702.0 latency 223.0
36017 : f622d30 Sample 36624 bytes time 33702.0 to 33735.0 latency 229.0
36045 : f622d30 Sample 38299 bytes time 33735.0 to 33769.0 latency 233.0
36064 : f622d30 Sample 37931 bytes time 33769.0 to 33802.0 latency 248.0
36086 : f622d30 Sample 38297 bytes time 33802.0 to 33835.0 latency 259.0
36108 : f622d30 Sample 38490 bytes time 33835.0 to 33869.0 latency 270.0
36126 : f622d30 Sample 40219 bytes time 33869.0 to 33902.0 latency 286.0
36157 : f622d30 Sample 45656 bytes time 33902.0 to 33936.0 latency 288.0
36177 : f622d30 Sample 44289 bytes time 33936.0 to 33969.0 latency 302.0
36205 : f622d30 Sample 39973 bytes time 33969.0 to 34002.0 latency 307.0
36225 : f622d30 Sample 38835 bytes time 34002.0 to 34036.0 latency 321.0
36251 : f622d30 Sample 43513 bytes time 34036.0 to 34069.0 latency 329.0
36277 : f622d30 Sample 39879 bytes time 34069.0 to 34070.0 latency 336.0 <--- End of Preroll frames
36608 : f622d30 Sample 40240 bytes time 34102.0 to 34103.0 latency 37.0
36648 : f622d30 Sample 40200 bytes time 34136.0 to 34137.0 latency 32.0
36676 : f622d30 Sample 40430 bytes time 34169.0 to 34170.0 latency 36.0
36711 : f622d30 Sample 40407 bytes time 34203.0 to 34204.0 latency 35.0
36748 : f622d30 Sample 43949 bytes time 34236.0 to 34237.0 latency 31.0
36786 : f622d30 Sample 40345 bytes time 34269.0 to 34270.0 latency 26.0
36805 : f622d30 Sample 40497 bytes time 34303.0 to 34304.0 latency 41.0
36846 : f622d30 Sample 40504 bytes time 34336.0 to 34337.0 latency 33.0
36872 : f622d30 Sample 114853 bytes time 34369.0 to 34370.0 latency 40.0
36906 : f622d30 Sample 20719 bytes time 34403.0 to 34404.0 latency 41.0