Talk:DNxHD codec

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The second paragraph reads like an advert, and contains some irrelevant information;


"Uncompressed high definition digital video is substantially more data than standard definition and can overwhelm general-purpose computer systems."

Debateable... but is that relevant to the article anyway? I think this should go.


"Other codecs such as HDV, DVCPRO HD, AVC-Intra, AVCHD, and HDCAM use compression techniques that limit the spatial and temporal resolution of the image."

I think the points that are trying to be made here are that;

  • DNxHD does not re-size the video; probably a good thing. DVCPROHD and AVC-Intra 50 class both re-size the video... they are lower bitrate, so presumably a trade-off is made between blur & DCT quantization type compression artifacts. DNxHD is probably high enough a bit rate not to benefit from sizing.
  • DNxHD is an intra compression format - i.e. it does not use motion-vector interpolated frames (B,P). This is probably a good thing given the intended market. HDCAM and HDV do use motion-vector interpolation - they are camera / VTR formats. HDCAM SR (much higher bitrate than DNxHD), DVCPROHD, and AVC-Intra do not. AVCHD is a consumer compression standard, and probably not relevant?

"DNxHD is an Intra compression format which does not resample the video" Would give the information, but with no context, and no reason. It doesn't explain very much. I don't know how to re-word this bit.


"While suitable for acquisition, these codecs will tend to degrade the image over the multiple encode-decode cycles that are typically required during the post-production of complex layered imagery."

All the codecs named, including DNxHD will degrade the image over multiple encode-decode cycles. Intra codecs such as DNxHD etc (see above) will only degrade the frame being modified, which is a good thing. Assuming the previous point on the Intra nature of DNxHD were re-written successfully, I think this should go.

--Guiddruid (talk) 12:41, 18 February 2008 (UTC)