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<title>Re: [Live-devel] TestH264VideoStreamer lags in VLC</title>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Perhaps a bug in VLC…..<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I tried with Elecard Stream Eye application and it does see 4 frames per second (progressive) in the H264 header and plays at such rate.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">GB<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> live-devel-bounces@ns.live555.com [mailto:live-devel-bounces@ns.live555.com]
<b>On Behalf Of </b>Ross Finlayson<br>
<b>Sent:</b> Monday, July 11, 2011 20:30<br>
<b>To:</b> LIVE555 Streaming Media - development & use<br>
<b>Subject:</b> Re: [Live-devel] TestH264VideoStreamer lags in VLC<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Here is an example file :<o:p></o:p></p>
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<p class="MsoNormal"><a href="http://www.mediafire.com/?rm6v38vx15nd9dv"><b><span style="font-size:24.0pt">http://www.mediafire.com/?rm6v38vx15nd9dv</span></b></a><o:p></o:p></p>
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<p class="MsoNormal">When I play it with VLC in my computer it plays normally. So I guess, as a encoder output is fine. But when I use for example TestH264VideoStreamer to stream it, what the client (also with VLC) sees is much more slow. It is like viewing
1 fps, although this sequence's frame rate is much higher.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Actually, "testH264VideoStreamer" thinks that the frame rate is 4 frames-per-second, and is streaming at that rate. However, VLC seems to stream at about 6 times that rate - i.e., at about 24 frames-per-second.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">So, my question - for H.264 experts - is the following: What is VLC seeing, in this file, that makes it see a frame rate of 24 frames-per-second, or so?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Our code ("H264VideoStreamFramer") is seeing<o:p></o:p></p>
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<p class="MsoNormal"> num_units_in_tick: 1<o:p></o:p></p>
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<p class="MsoNormal"> time_scale: 8<o:p></o:p></p>
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<p class="MsoNormal"> fixed_frame_rate_flag: 1<o:p></o:p></p>
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<p class="MsoNormal">and from this is inferring a frame rate of 4 frames-per-second. So how is VLC inferring a much higher frame rate??<o:p></o:p></p>
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<pre>-- <o:p></o:p></pre>
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<p class="MsoNormal"><br>
Ross Finlayson<br>
Live Networks, Inc.<br>
<a href="http://www.live555.com/">http://www.live555.com/</a><o:p></o:p></p>
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