[Bug 693000] codecparsers: mpeg2: fix default quantizer matrix for intra blocks

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=693000
  GStreamer | gst-plugins-bad | git

--- Comment #12 from Gwenole Beauchesne <gb.devel at gmail.com> 2013-02-05 13:29:38 UTC ---
(In reply to comment #11)
> http://www.bretl.com/mpeghtml/zigzag.HTM refers to this for mpeg-2, but it's of
> course far from authorative, or I might be misunderstanding the context. Just
> thought it might be relevant for deciding the API, since one would have to pick
> the right zigzag table for the conversion then, no?

Ah, that's for the DCT coefficients. The quantisation matrices always use the
scan 0 (zigzag) order. scan 0 == "alternate_scan set to zero". Quantization
matrices are denoted W (weighted coefficients). The DCT coefficients are
denoted QF. The output of the inverse quantisation process is a function of QF
* W * something else (roughly). So yes, that represents different things. :)

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