why I can't find video-objetc-layer of mpeg4-2 video stream after qtdemux?

[Zhao, Halley]

Thanks.
Now, I can parse params from codec-data

> -----Original Message-----
> From: gstreamer-devel-bounces+halley.zhao=intel.com at lists.freedesktop.org
> [mailto:gstreamer-devel-bounces+halley.zhao=intel.com at lists.freedesktop.or
> g] On Behalf Of Wim Taymans
> Sent: Friday, November 18, 2011 5:41 PM
> To: gstreamer-devel at lists.freedesktop.org
> Subject: Re: why I can't find video-objetc-layer of mpeg4-2 video stream after
> qtdemux?
> 
> On 11/18/2011 10:32 AM, Zhao, Halley wrote:
> >
> > I connects a mpeg4-2 video parser/codec after qtdemux, the first
> > start_code I could find is gop (0xb3) or vop (0xb6).
> >
> > Why isn't there video-object-layer header (0x20)?
> >
> > How could I parse vop with the necessary data in vol?
> >
> > Does it mean something wrong in the stream? Or I should construct a
> > vol with default value? (what are the default value?)
> >
> > However, totem can playback the stream.
> >
> It's on the caps in the codec_data property.
> 
> Wim
> >
> > I don't think it is a h263 stream with short header since it doesn't
> > start with 16 bits '0', but 23 bits'0'
> >
> >
> >
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