<div style="font-family: Verdana;font-size: 12.0px;"><div>
<div>Thanks again for your comments.</div>
<div> </div>
<div>
<div>My plan was to send different NALU types via a different transport channel with configurable Quality of Service. Such that non Video Coding Layer NALUs (e.g. SPS and PPS) can be send via a more reliable channel. It appeared to me more straight forward to handle each NALU as they are produced and not placed in a container already.</div>
<div>But indeed the overhead will be marginally and I will use the h264parse element functions which will give my transport payloader the NALUs seperated.</div>
<div>On the receiver side I will place the h264parse element in fornt of the decoder (avdec_h264).</div>
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<div> </div>
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<div style="margin:0 0 10px 0;"><b>Gesendet:</b> Samstag, 22. Februar 2014 um 18:13 Uhr<br/>
<b>Von:</b> "Tim Müller [via GStreamer-devel]" <<a href="/user/SendEmail.jtp?type=node&node=4665471&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>><br/>
<b>An:</b> pfarmer <<a href="/user/SendEmail.jtp?type=node&node=4665471&i=1" target="_top" rel="nofollow" link="external">[hidden email]</a>><br/>
<b>Betreff:</b> Re: What is the alignment capability in video/x-h264</div>
<div name="quoted-content">
<div>On Sat, 2014-02-22 at 04:47 -0800, pfarmer wrote:<br/>
<br/>
> > What's not "possible" exactly?<br/>
> It is not possible to output NALU aligned buffers from the x264enc<br/>
> element (as it wasn't in gstreamer0.10 either).<br/>
<br/>
Well, the output of x264enc is always also NALU aligned, since AU<br/>
alignment is a subset of NALU alignment. Where does it make a difference<br/>
for you? Is it just about the caps, or something else? The only<br/>
difference I can think of is that if you could get the encoder to output<br/>
a partial frame already you have marginally lower latency. Whether x264<br/>
actually supports that, I don't know (but didn't check). Most encoders<br/>
don't.</div>
<div> </div>
<div><br/>
<br/>
> It is also not possible to give NALU aligned buffers to the<br/>
> avdec_h264 element.<br/>
> The reason is that I want to built my own packetizer for another<br/>
> transport protocol. For this, it would be sufficient/easier to get the<br/>
> NALUS directly.<br/>
<br/>
There was parsing done inside ffdec_h264, now parsing is done in<br/>
h264parse. Why not just put an h264parse in front of avdec_h264? Is it<br/>
about parsing overhead, or caps or.. ?<br/>
<br/>
Cheers<br/>
-Tim<br/>
<br/>
--<br/>
Tim Müller, Centricular Ltd - <a href="http://www.centricular.com" target="_blank" rel="nofollow" link="external">http://www.centricular.com</a><br/>
<br/>
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