[FFmpeg-devel] [PATCH] Enable PAFF decoding

[Neil Brown]

On Friday October 12, michaelni at gmx.at wrote:
> the bugs just no (partially?) cancel each other out

Fair enough.  I must admit that I find it very hard to follow the
intended logic of that code and was focussed on producing the desired
outcome.

> 
> 
> > 
> > It still leaves the first (presented) frame badly decoded though.
> > There is a "double-vision" effect, as though the second field is being
> > decoded with reference to the first (decoded) frame instead of the
> > first field in the same frame.... does that make sense?
> 
> no, the first (IDR) frame should be decoded correctly, the "next" B frames
> are prior to IDR in display order and cannot and should not be displayed 

Perplexed...
If those B frames "cannot and should not be displayed", why would they
be put in the data stream at all, and why does the reference decoder
decode them correctly?

NeilBrown