Dan Egnor (12022-02-15):
> My understanding of the OP was not that they wanted to embed anything in
> the bitstream but just that they wanted to set a cookie in AVFrame that
> would show up in the corresponding AVPacket (if encoding) or vice versa (if
> decoding), hence the suggestion of reordered_opaque. Quite possibly I
> misunderstood! Maybe the OP can clarify.

The original message has not disappeared, you can re-read it.

"add a custom number [] before I encode it  and I want to retrieve it
back when I decode it."

Once FFmpeg has encoded and muxed, it is done with the data, there is no
connection to a later decoder. Therefore any transmitted data needs to
be in the output file.

-- 
  Nicolas George

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