[XviD-devel] Re: XviD 1.0 Feature Request: autodetect iDCT decoder(fwd)

Ivan Kalvachev ivan at cacad.com
Thu Nov 20 23:04:06 CET 2003


Christoph Lampert said:
>
> Hi,
>
> I got this by private mail.
> Would it be possible to autodetect this?
>
> gruel
>
>
> ---------- Forwarded message ----------
> Date: Thu, 20 Nov 2003 19:33:21 +0100 (CET)
> From: ------- <uldead at freemail.hu>
> To: gruel at xvid.org
> Subject: Re: XviD 1.0 Feature Request: autodetect iDCT decoder
>
>
> Hi
>
> I have an  idea  for feature of XviD 1.0: You must know that some
> versions used Simple iDCT instead of Walken.  You also know that if
> you played back it with Walken iDCT versions artifacts would appear.
> So my idea would be to implement some kind of autodetect that would
> determine that if the codec should use Simple or Walken iDCT for
> decode. It would be essential for backwards compatibility i think,
> because a lots of ppl still using the Simple iDCT versions, and i have a
> pretty good archive of videos encoded with Simple iDCT ones, and they
> look very bad played back with Walken, and i dont like the idea of trash
> em.
>
> So what do you think ? plz answer back even if you think its a lots of
> bullshit
>
>
> Martin

I thought that old no IEEE-1180 complaint IDCT are threated
as encoder bug.
You have an counter and you write it into the stream,
so it is quite easy to read it back, and workaround it.


Best Regards
   Ivan Kalvachev
  iive



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