Passing additional info along with GstBuffer to downstream element

[Arun Raghavan]

On Mon, 27 Jun 2016, at 03:13 PM, Vinod K wrote:
> Hi All,
> 
> I have captured some data in the decoder and store in memory. I want to
> pass
> it to down stream element (e.g Encoder) as memory pointer. 
> 
> After doing little bit of research found that GstTagList and GstMeta can
> be
> used.
>   - GstTagList can be used to send pointer as event to downstream
>   element.  
>   - GstMeta of buffer can be used where it flows with the buffer.
> 
> Which one better ?? Please give me plugins name where I can look into.
> Is there any better way to do this ??

This really comes down to what kind of metadata this is and how it is
consumed downstream.

If it's something stream-related, it might make sense to emit a tag. If
it is metadata that is specific to the buffer, a meta makes sense.

It might be easier to talk about what method is best if you are able to
share what you're trying to do more specifically.

-- Arun