[FFmpeg-devel] A very basic DCT question

Roman Shaposhnik rvs
Fri Sep 19 18:01:34 CEST 2008


I'm going to ask the most basic (perhaps even stupid) question
of all -- is there a way to hook DCT routines that do NOT
scale their output by a factor of 8x to dsputil properly?

I haven't touched that part of FFmpeg for at least 5 years,
but last time I did, I had an impression that it was
possible to tell  DSPContext what scale factor was there.

And since we are on this subject: can someone, please,
provide a sufficient background for me to understand
where did this 8x scale factor come from to begin with?
Most of the DCT implementations I see around don't
have anything like that.


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