blu-ray to BD-25...quality?

[jlm86]

Do you notice any quality difference in backing up your BD
Movie Only to a BD-25 ?

Many of the movie only to BD-25 are stating a 75% or so quality
conversion...so i was just curious....

[yoda313]

I have not done any personally as I do not have a bluray burner.

My opinion would be it should be similar to compressing a dual layer dvd to single layer. Some purists would notice every bit of compression whereas others would hardly notice any loss at all.

I'm guessing the same would be true of compressing full size bluray discs to single layer bluray discs. It would mostly be up to the individual to decide if the quality is acceptable or not. Also the size of the tv would probably have some deciding factor on the compression issue. I imagine larger tvs would show off the compression factor more than smaller sets (more detail on bigger sets)

[Kerry56]

Put me in the "don't notice much difference" group. But I don't have very large tv screens. BD Rebuilder and the x264 encoder do a very fine job when going to 25gb size.

[ricoman]

I've backed up several with BDrebuilder to BD25 and noticed no difference on my 60" Sony LCD TV. I always do movie only. Frankly, I backed up several to BD9 (regular Verb DL discs) and can hardly see difference with them.

[Spoffo]

I've done several where I compressed a file that was around 30-35 GB to fit a movie-only BD25. (Very few normal length movies use a full BD 50. I've seen quite a few BD 50 releases where the main feature is actually under 25 gb.) Playing back these discs on a Panasonic 54VT25 plasma from an Oppo BD 93 player, I honestly haven't been able to see ANY difference. You're still looking at some pretty high bit rates, so the incremental difference is much less than, say, the difference between 7-8 mbps and 3-4 which is what you're often looking at when you compress from a DVD 9 to DVD 5.

[fritzi93]

Yeah, any detectable difference is the inevitable result of re-encoding with lossy compression. You have to go a lot lower in bitrate to much affect AVC (H.264) encodes; the bitrate will still be quite high for BD25. But as already mentioned, many will fit movie-only as is, others will fit if extra audio tracks are deleted, even more if you keep a single audio track and re-encode to AC3.