What is the alignment capability in video/x-h264

[Tim Müller]

On Wed, 2014-02-05 at 05:38 -0800, pfarmer wrote:

Hi,

> Thank you very much!
> 
> That was a very helpful information! 
> 
> Just as an information:
> 
> These are the caps as reported by testing with fakesrc/fakesink and
> video/x-h264 capsfilter
> 
> stream-format:byte-stream || stream-format:avc
> au | nal || : au | nal
> 
> gsteamer-1.0
>   x264enc: y | n || y | n   
>   rtph264pay: y | y || y | n   
>   rtph264depay:  y | y || y | n   
>   avdec_h264: y | n || n | n   
> 
> So it seems that nal alignment is not (not yet) possible with the
> gstreamer-1.0 implementations (v1.2.0 Ubuntu 64 13.10)

What's not "possible" exactly?

> gsteamer-0.10  
>   x264enc: y | n || y |  n  
>   rtph264pay:  y | y || y | y   
>   rtph264depay: y | y || n | n
>   ffdec_h264: y | y || y | y
> 
> I have not yet examined the source code if it is only a caps filtering
> problem or if the functionality is really not implemented.   

AVC is always au-aligned, so anything else doesn't make sense there. In
1.0 we generally require parser before decoders now, which explains the
change in avdec_h264.

 Cheers
  -Tim

-- 
Tim Müller, Centricular Ltd - http://www.centricular.com