comparing p2p to scene high def releases

twone

New member
I've been downloading hd from usenet over a year now and found that a lot of good releases come from various p2p torrent sites. Assuming it was always the case, I sometimes wait for the p2p release, or replace my scene release when it arrives.

But when I look at the nfos, I notice that a lot of releases are almost the same exact file size and bitrate. Sure, plenty are monsters, with 20GB files for some 1080p movies, but especially 720p movies tend to track the scene releases. My limited understanding of encoding leads me to believe that there are basic settings to get the most transparent encode to source.

So what is it that makes them better quality? How much of a factor is bitrate? How much depends on the source quality? I realize these are basically encoding questions, but I hoped the most active section oriented towards torrents, where these files originate, might have some folks who could enlighten me.
 
There are several factors that determine the quality of an encode. Bitrate does not tell all, especially since it's a VBR algorithm.

To name a few standard x264 parameters: Various filters, SAR, deblocking, quantization methods, motion smoothing, ref frames, bframes, etc.

The type and quality of audio used also has a large effect on the filesize.

The reason P2P encodes are generally better is because they can take all the time they need to polish settings, check interlacing, retry several encoding parameters, and can optimize for quality rather than speed. Additionally, they don't need to conform to scene filesize regulations that limit video quality. P2P encoders can also wait for a better source to come along, as quality is also source dependent.
 
Thanks for the explanation. I guess only some groups provide the information about those settings, like Framestor's media-info file. I guess I could always pull that info after downloading, but it would be great if more groups provided all the necessary facts.

I'm just glad that I was correct in "seeing" the difference between releases even when the limited nfo stats seemed comparable.

Thanks for the info.
 
Back
Top