Originally Posted by lcaillo
You can get sparkles and more subtle pixelation when a cable is on the edge of acceptable performance. It will not make the image softer, but some might consider it to be "blurry" in a general sense. Judder is not related and I beleive that the term was misused when it was discussed earlier.
Bill, I believe if you read the HDMI spec more carefully, you will find that error correction is available at the packet level, which include both audio and video.
With your prompting, I looked again at the spec. It appears to me, still, that the packet level includes only audio and control info, not video pixel data. In particular,
From pages 8-9:
In order to attain the higher reliability required of audio and control data, this data is protected with a BCH error correction code and is encoded using a special error reduction coding to produce the 10-bit word that is transmitted.
From page 54:
The input stream to the Source's encoding logic will contain video pixel, packet and control data. The packet data consists of audio and auxiliary data and associated error correction codes.
Video Data Periods use transition minimized coding to encode 8 bits per channel, or 24 bits total per pixel.
Data Island Periods are encoded using a similar transition minimized coding, TMDS Error Reduction Coding (TERC4), which transmits 4 bits per channel, or 12 bits total per TMDS clock period.
Beginning at page 58, it describes the data island period, including the ECC generation.
I have not yet read the document cover-to-cover. But this time I did a search for every instance of the word "error" to see what was discussed. And I don't yet see where video pixel data is covered by any error correct. Honestly, I really am looking for it, I hope my citations above are not taken as trying to provoke an argument, I just don't see it.