<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div><blockquote type="cite" class=""><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Helvetica; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">I need to keep a constant 3 second buffer of an H264 video stream. It's for security cameras. When something trips the camera, I replay the 3 seconds and then 6 more to see the event (One hopes I'll catch some ghosts or mountain lions, but really it's to catch<span class="Apple-converted-space"> </span><span style="color: rgb(31, 73, 125);" class="">car thieves</span>!). With mpeg it was easy because mpeg has discrete frames, but the much better definition h264 doesn't. I mean it does, but they're spread out over an indefinite series of NAL packets that can contain various varieties of slices. Squishing together into a discrete frame is a problem.</div></div></div></blockquote><div><br class=""></div><br class=""><blockquote type="cite" class=""><div class="WordSection1" style="page: WordSection1; font-family: Helvetica; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p><span style="font-size: 11pt;" class="">It seems to me that there are two different paradigms at work in live555. Modules that derive from Medium and modules that derive from MediaSource. </span></div></div></blockquote><div><br class=""></div>No, this is completely wrong. (Note that “MediaSource†is a subclass of “Mediumâ€.)</div><div><br class=""></div><div>I suggest that you begin by reviewing the “testRTSPClient†demo application (in the “testProgs†directory). Note, in particular, the “DummySink†object that receives ‘frames’ (for H.264 video, each ‘frame’ will actually be a NAL unit). Note the code for “DummyRTPSink::afterGettingFrame()†("testRTSPClient.cppâ€, lines 500-521). For your own RTSP client application, you could write your own ‘sink’ class (a subclass of “MediaSinkâ€) that receives H.264 NAL units, and processes them however you want.</div><br class=""><div apple-content-edited="true" class="">
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; ">Ross Finlayson<br class="">Live Networks, Inc.<br class=""><a href="http://www.live555.com/" class="">http://www.live555.com/</a></span></span>
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