How to add custom data on buffer

[slayer69]

Hi I'm trying to pass buffers (frames) with custom data through pipeline with
some decoders encoders etc.. , but I can't figure out, how to do it. 

I had an idea to store information outside of pipeline and attach it to each
buffer on the basis of its own offest number (which I was set after buffer
creation). But that buffer on sink element came with deleted value, same
like GST_CLOCK_TIME_NONE and other constants...

Any ideas? 
Thank you



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