Hello devs, 

I have a quick question about passing data from AVFrame to AVPacket. Assume 
that we are encoding video and we have a custom metadata that needs to be 
handled in a frame accurate manner. The AVFrame can refer to this using the 
opaque pointer. However, due to the nature of video coding, the video packet 
that we get back when we encode video is not the frame that we have just pushed 
to a codec. In this case the packet and the AVFrame gets decoupled. 

What is the best practice to have a reliable flow of metadata from AVFrame to 
AVPacket?
Cheers,

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