[gst-devel] tee src pad buffers

[Ron McOuat]

Thanks Tim for your kind advice. This clarifies the way forward for me. 
I also found the resettime element by Arnout Vandecappelle which I 
believe does what I need.

Tim-Philipp Müller wrote:
> On Fri, 2009-02-27 at 10:26 -0800, Ron McOuat wrote:
>
> Hi,
>
>   
>> [tee element internals] From this I presume tee replicates references
>> and not actual contents.
>>     
>
> Correct.
>
>   
>> My issue is using a live source, downstream from the tee I offset time 
>> stamps using a buffer probe handler for when recording is turned on or 
>> off in one of the branches. The time offset changes bleed into the other 
>> tee branches because of what I think is buffer reference copying instead 
>> of content copying.
>>     
>
> Correct. You aren't really allowed to do this in a buffer probe
> callback. What you want to do before changing the offset is
> gst_buffer_make_writable(), which will copy the buffer *structure* and
> metadata if needed (but not the content) so you can change it. However,
> you can't use that in a pad probe callback, since you can't return the
> new buffer pointer.
>
> You should/need to write an element to do this.
>
>
>   
>> As an alternate I could feed the front end into a multifdsink and then 
>> pull the data out for the different purposes by connecting to that 
>> element using a UNIX socket. I would prefer to not do this for 
>> efficiency reasons but the system use is minimal for moving data around 
>> so maybe not a good reason to avoid this approach.
>>     
>
> The latest gst-plugins-base release contains the appsink element, which
> is a much easier and much more efficient way to get data out of a
> pipeline if you have to.
>
> Cheers
>  -Tim
>
>
>
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