Log in

View Full Version : BD-Rebuilder Re-encode of a Re-encode

ron spencer
24th February 2010, 16:43
Just for fun over the past few days, I decided to try a few re-encodes of a BD-Rebuilder re-encode. This was done by simply reducing the target file size. I used High Quality encode. Even after 3 re-encodes the encode (movie only) still looks pristine.

How far can one do this before losing some level of quality on my 50" Samsung plasma? Could one do the fast re-encode as well? Man this program is nice.

I did this just for fun, I do not know that much about h264/X264 so I was just wondering about this and how far you can push the envelope in terms of quality.
jdobbs
24th February 2010, 22:10
Just for fun over the past few days, I decided to try a few re-encodes of a BD-Rebuilder re-encode. This was done by simply reducing the target file size. I used High Quality encode. Even after 3 re-encodes the encode (movie only) still looks pristine.

How far can one do this before losing some level of quality on my 50" Samsung plasma? Could one do the fast re-encode as well? Man this program is nice.

I did this just for fun, I do not know that much about h264/X264 so I was just wondering about this and how far you can push the envelope in terms of quality.It very definitely degrades with each encode... but X264 is also a very, very good encoder, so it might take a little time for the cumulative effects to surface visibly.
Ghitulescu
25th February 2010, 09:22
Each recompression would degrade the quality. But the quality perception is very personal and there's no agreed standard like 80% quality, 70% or 100% quality.

The first generation of Casablanca editing devices (actually a PC with a proprietary software and lots of aquisition hardware) was advertised in the good old times when no digital ripping of DVD did exist as doing a perfect analog recapture of a DVD movie (circumventing Macrovision was not illegal at that time). It was not perfect but it was of a very high quality.

In the end the generation losses would accumulate ... up to the point they will become noticeable also by the average Joe ... hopefully it's not too late ...