[Live-devel] SVC -> AVC

[Sergey G. Kosov]

I have tried to rewrite H264VideoStreamFarmer with H264VideoStreamParcer to
SVCVideoStreamFarmer with SVCVideoStreamParcer correspondingly. Especially I
put attention to the parse() function. The problem I met now is that the
parse() function stucks, when some of the input packets should be ignored.

 

I use "svcext" library to analyze the H264 packets. Since there are till 9
AVC flows in one SVC, I have to skip some redundant packets, but when I try
to skip them in the parse function it just stucks. Could you, please, help
me with explaining how should I process the data in that case.

 

I attach the class files to this letter. Maybe you also find them useful to
include in your library in the future to add the support of SVC streams.

 

Thanks in advance.

 

 

 

From: live-devel-bounces at ns.live555.com
[mailto:live-devel-bounces at ns.live555.com] On Behalf Of Joao Almeida
Sent: Wednesday, July 06, 2011 9:36 AM
To: live-devel at ns.live555.com
Subject: Re: [Live-devel] SVC -> AVC

 

I belive live555 don' t support yet h264/SVC :(
 
look from openSVC with there modified MP4box for SVC, you can hint the
SVC.264 in a standard MP4 cointainer wich "H264VideoStreamFarmer" can use.
 

  _____  

From: sergey.kosov at project-10.de
To: live-devel at ns.live555.com
Date: Wed, 6 Jul 2011 02:25:57 +0200
Subject: Re: [Live-devel] SVC -> AVC

>>I wonder how to extract an AVC flow from the SVC file, using live555 

>>library. Should it be a filter?

 

> I'm not sure what a "SVC file" is, but it it's the same as a ".264" file

> - i.e., a sequence of H.264 NAL units, each preceded by 0x00000001 - 

> then you may be able to use "H264VideoStreamFramer" (or perhaps a slight 

> modification of this).

> 

> -- Ross FinlaysonLive Networks, Inc.

>  <http://www.live555.com/> http://www.live555.com/

 

Thats right. I mean that SVC stream is a container with up to 9 layers (3
temporal and 3 spacial), where each layer could be represented as an AVC
stream. It is possible to extract the needed layer with i.e. "svcext
library". But I want to do that with the help of live555. 

Processing SVC stream with "H264VideoStreamFramer" produces a .ts file with
spacial layer equal to 0 and temporal layer also equal to 0. And my question
was about extracting a user-defined layer to save it in a .ts file. I use as
an example testH264VideoStreamer application from the original library
package.

 


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