Output quality of blu-ray, can it be changed?

Question

I've already started a discussion on this issue, but i cant seem to reply to their answer.  So i had to open another discussion.  Apologise for any mistake.
Quote by Bill Hunt;
Re: Can we change the quality of the output for Blu-Ray?  & 6 Channels Audio output?
I  am confused on your workflow here. It seems that you are Importing  material that is already in fully BD-compliant form, but then are  Transcoding again?
Can you step us through the exact Assets that you are working with, and the steps that you are taking with those Assets?
Also,  if you have a muxed MPEG source file, I would rip it to the  elemental/elementary streams, as Encore has some issues with muxed MPEG  source files. Also, you will want to rip the two Audio streams, and  Import those separately. These Assets should show Do Not Transcode, if  they are 100% BD-compliant. If they do not, you should be able to force  Encore to NOT Transcode them, so the quality should match that of the  Imported files exactly, and no more work should need to be done.  Remember, that is if they ARE 100% BD-compliant - very important.
If  you already have your dual-Audio streams, you will not need the SurCode  DD 5.1 SS encoder plug-in, in this case, as that encoding has already  been done, or at least I think that it has been done.
Good luck, and we'll be looking for details on your workflow,
Hunt
My reply;
I am working with m2ts files from another BD.  I'm trying to create a Music BD.  I'm extracting the songs from multiple BDs.
I wanna create my own menu and pop-up menu(i will create another discussion for this issue)
The    output quality is far inferior that the input file, like 10 times    worst.  I want to know if there is something i can do to overrride  this   thing.
Thanks.
Arshad

Answer 1

You would export to full quality in whatever format it currently is (probably AIC). Then you would put this into Toast (with the Blu-ray plugin installed). You can adjust the encoding settings in Toast.
Bitrate affects how much data is used to construct video. DVDs are encoding in mpeg2 video, with a bitrate around 4.5 Mbps (megabits per second; take this and divide by 8 to get megabytes per second). Do the math, and you will come up with around 2 hours of 4.5Mbps fits on a 4.7GB DVD.
Blu-ray uses three possible video codecs: VC-1 (basically a new windows media), mpeg2 (like a DVD, but high def), and H.264 (also called AVC). Toast allows mpeg2 or H.264. H.264 is more compact but takes a LONG time to encode. A very general assessment of mpeg2 and H.264 is that both offer the same quality, but H.264 can use about half the bitrate of comparable mpeg2, at the same dimensions.
You have to decide how low you can go before the quality worsens. As I said, I would say in general you could set the bitrate as low as 11mbps for H.264. If there is a lot of action, or detailed textures such as moving grass or water, it might need to be higher.
I just opened Toast and starting dropping movies into an AVCHD disc. With the bitrate in encoding settings up to the max of 26mbps, I can put 40 minutes on. So you could play around with it, and see how your footage looks.
Clean, well-lit, tripod shot footage with noise filters and professional cleaning can compress very well. Professional BD sometimes go as low as 6mbps in scenes. Home movies have more noise and shake, and need more data to be compressed.
50 minutes fits, with a bitrate of 11.5mbps, with audio in 448kbps Dolby Digital.