<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"><base href="x-msg://658/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><blockquote type="cite"><div lang="DE-AT" link="blue" vlink="purple" style="font-family: Helvetica; font-size: medium; 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-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class="WordSection1" style="page: WordSection1; "><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US">I have few options for this:<o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US"> 0 implies that the encoder will add the start codes<o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US"> 1, 2, 4: length prefixed NAL units of size 1, 2, or 4 bytes<o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US"> </span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US">If I set up the parameter to 0 the Discreteframer complains with the following message ‘</span><span lang="EN-US" style="font-size: 9.5pt; font-family: Consolas; color: rgb(163, 21, 21); ">H264VideoStreamDiscreteFramer error: MPEG 'start code' seen in the input\n"</span><span lang="EN-US" style="font-size: 9.5pt; font-family: Consolas; ">;’ I guess that’s expected because I should not include start codes at this point all clear.<span class="Apple-converted-space"> </span></span><span lang="EN-US">However, with the parameter in the encoder set to 1, 2 or 4 it didn’t complain at all but I still do not visualize anything in the player.</span></div></div></div></blockquote><div><br></div>Remember that the data that you copy to *fTo should be a NAL unit, and nothing else. That means no start code at the front. But it also means nothing else at the front - including your 'length prefix'.</div><div><br></div><div>In other words - you need to omit the 'length prefix' when you copy the NAL unit to *fTo. (Of course, you will use this 'length prefix' value to tell you how much data to copy, and you'll also set "fFrameSize" to this value.)</div><div><br></div><div><br></div><div><blockquote type="cite"><div lang="DE-AT" link="blue" vlink="purple" style="font-family: Helvetica; font-size: medium; 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-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class="WordSection1" style="page: WordSection1; "><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span lang="EN-US">I wonder why are the implications with start codes or prefixed NAL units size and the discreteframer..</span></div></div></div></blockquote><div><br></div></div>You don't need to speculate about this. Remember, You Have Complete Source Code. Just look at the code in "liveMedia/H264VideoStreamFramer.cpp", starting at line 62. This code expects the delivered data to be a NAL unit - i.e., beginning with a byte that contains the "nal_unit_type" - and nothing else.<br><br><div apple-content-edited="true">
<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; font-size: medium; "><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; font-size: medium; ">Ross Finlayson<br>Live Networks, Inc.<br><a href="http://www.live555.com/">http://www.live555.com/</a></span></span>
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