Hi,

Next parts of the VAAPI support series follows, now concentrating on encoding.

Changes:

* Removed FF prefix from internal types.

* Added CAP_DELAY to the encoders which take B-frames - now drains frames 
correctly at the end of the stream.

* DTS generation now works.

* Fixed QP mode now respects B quant factor / B quant offset.

* Fixed B frames in H.265 (error in the slice header, usefully tickled by 
slice_qp_delta != 0 for the previous point).

* It's now the AVCodecContext which gets passed everywhere inside the encoder, 
rather than the internal context structure (and used as the logging context).

* Rearranged some of the encode structures to make it easier to support more 
variations.

* MJPEG encoder added.  Mainly written as a test for an encoder which doesn't 
look like H.26[45], but fully working on its own (baseline 4:2:0 only).


Thanks,

- Mark
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