Aw: Re: What is the alignment capability in video/x-h264
flacone at gmx.de
Mon Feb 24 00:55:21 PST 2014
Thanks again for your comments.
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.
But indeed the overhead will be marginally and I will use the h264parse element functions which will give my transport payloader the NALUs seperated.
On the receiver side I will place the h264parse element in fornt of the decoder (avdec_h264).
Gesendet: Samstag, 22. Februar 2014 um 18:13 Uhr
Von: "Tim Müller [via GStreamer-devel]" <ml-node+s966125n4665440h42 at n4.nabble.com>
An: pfarmer <flacone at gmx.de>
Betreff: Re: What is the alignment capability in video/x-h264
On Sat, 2014-02-22 at 04:47 -0800, pfarmer wrote:
> > What's not "possible" exactly?
> It is not possible to output NALU aligned buffers from the x264enc
> element (as it wasn't in gstreamer0.10 either).
Well, the output of x264enc is always also NALU aligned, since AU
alignment is a subset of NALU alignment. Where does it make a difference
for you? Is it just about the caps, or something else? The only
difference I can think of is that if you could get the encoder to output
a partial frame already you have marginally lower latency. Whether x264
actually supports that, I don't know (but didn't check). Most encoders
> It is also not possible to give NALU aligned buffers to the
> avdec_h264 element.
> The reason is that I want to built my own packetizer for another
> transport protocol. For this, it would be sufficient/easier to get the
> NALUS directly.
There was parsing done inside ffdec_h264, now parsing is done in
h264parse. Why not just put an h264parse in front of avdec_h264? Is it
about parsing overhead, or caps or.. ?
Tim Müller, Centricular Ltd - http://www.centricular.com
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