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

[Wim Taymans]

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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