[Ffmpeg-devel] Re: [PATCH] DVCPRO50 support

[Roman Shaposhnick]

On Fri, Mar 03, 2006 at 04:08:56PM -0500, Dan Maas wrote:
> > Now, DVCPRO 100 is, in fact a different CODEC regardless of the name
> > being similar to the DVCPRO 50.
> 
> Not really. If I implement DV100 I will do it just like DV50. It will
> just need a separate version of dv_set_class_number() and
> dv_guess_qnos(). All the rest is identical to DV25/DV50. (blocking, AC
> encoding, audio, muxing, etc).

  Really ? I though that the spec required different quantization (JPEG-like)
  and different bit distribution techniques to be used. 

  I guess the criteria I've been using for distinguishing between a DV 
  CODEC and just a DV CODEC variation is: whether you have to make non trivial
  changes bellow dv_decode_video_segmet/dv_encode_video_segmet level.

  The impression I got from your thorough assessment of DV100 back
  in December was that such non trivial changes would be required. 

  Could you, clarify a bit, please ?

Thanks,
Roman.