Video Asylum

RE: quality question

71.108.144.56

tunenut

In Reply to: RE: quality question posted by blue_z on May 07, 2008 at 17:01:35

Thanks for your answer. I am new to all this, having just gotten my first HD screen, a computer monitor. I have downloaded a couple of these x267 transcodes, one of which is amazing, the other which has some noticeable artifacts. I guess my question still applies. When these are turned into smaller files, has anyone compared to the original to see what might be lost?

Follow Ups:

RE: quality question - blue_z 17:40:09 05/07/08 (1)
Hi there

You have a good question, but I have not done any transcoding to H.264/AVC. One issue is that the PQ of TV shows varies and overall is not all that great. I've downconverted a few episodes of "Lost" and "House" to DVD resolution, and then upconverted for playback on a 720p CRT projector. The difference in PQ is not obvious to me. Some of the travel and nature shows on PBS have great PQ. If only the commercial broadcast networks matched that picture quality!

When transcoding, the digital artifacts will accummulate. And because these are lossy compression schemes, information is lost with each encoding. The concept of "perfect digital copying" does not apply here. Hope somebody can give you an answer.

Regards
- "The concept of 'perfect digital copying' does not apply here." If it ever does! - clarkjohnsen 07:53:17 05/09/08 (0)
  But thanks for the clarity on "transcoding".
  
  BTW I have an 8' screen and a JVC D-ILA, with which many (too many?) details can be seen.
  
  clark

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