[gst-devel] Question on H.264 AnnexB package mode in MP4 container

[Farah Akhtar]

Alright... may be this is not the right place to ask my question. My apologies!




________________________________
From: Farah Akhtar <farahakhtar_24c at yahoo.com>
To: Discussion of the development of GStreamer <gstreamer-devel at lists.sourceforge.net>
Sent: Wed, May 26, 2010 6:12:07 PM
Subject: Re: [gst-devel] Question on H.264 AnnexB package mode in MP4 container


Hey

Did you find an answer to this question yet? I'm also looking at the Annex B of the H.264 specification and want to know how exactly is it currently implemented in gstreamer payloaders like rtph264vpay etc.

As it seems from my experience, the Single NAL unit mode as given in RFC3894 doesnt work. I see that even when I encode from the H264 encoder using slice modes and all settings are such that only one slice goes into one NAL unit, even then, my RTP packet given by rtph264vpay is larger by tens of times than it should be. I think this is because the payloader doesnt implement the Single NAL unit mode (which should be the default more as stated in RFC 3894) and puts several NAL units in one RTP Packet. Can anyone please help verify this?

Also, is there a way I could get the Single NAL unit mode to work? Am I missing something here?





________________________________
From: "Chen, Weian" <weian.chen at intel.com>
To: Discussion of the development of GStreamer <gstreamer-devel at lists.sourceforge.net>
Sent: Fri, December 25, 2009 7:05:09 AM
Subject: [gst-devel] Question on H.264 AnnexB package mode in MP4 container

 
Hi All
 
As you know, h264 streams come in two package
modes:
1.       Length
prefixed
2.       start
code prefixed (AnnexB)
 
My question here is: can we put start code prefixed
H.264 stream into MP4 container, is it legal or not?
 
Thanks in advanced.
 
Weian Chen 
Ultra Mobility Group 
Intel Corporation
Tel: 
86-21-6116-6478
Fax: 86-21-3429-1915
iNet: 8-821-6478


      
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