Blu-Ray Muxing Overhead - how much?

[Malow]

hi, im doing my firsts blu-ray disks with DVD Architect, and soon i discovered the muxing of files are larger than i was used to dvd.. making my files not fit the disk.

DVD-A added almost 5% to the size of muxed video, and tsMuxer added 4.7%

this is normal? or some types of videos can be more/less?

example:
24.111.994.483 bytes (.264 + .ac3 audio)
25.339.183.104 bytes (muxed .m2ts from DVD-A)
25.300.905.984 bytes (muxed .m2ts from tsMuxer)

around 1.2gb of muxing... :o

[Groucho2004]

Yes, m2ts has a huge overhead compared to other containers like mkv or avi. The overhead depends on several factors, number of frames, audio format, etc. It's not trivial to calculate the overhead.

[Ghitulescu]

This was discussed. You may use the search function of this forum or even google.
The muxing overhead depends mostly on the number of streams inside, then on audio type, video type etc.

[Sharc]

This tool (http://tools.twanwintjes.nl/index.php?page=avchdcalculator)can be helpful. It estimates the available video bitrate with reasonable accuracy.

[Malow]

thanks guys for the help.

after tons of testings, ive redone calculation methods, now everything is fine.

looks like the overhead is mostly based on the file size directly, not on playtime (overhead is almost the same on a 5min 30mbps file vs. 10 min. 15mbps file)

so, reducing 7% on disk size calculations is a safe margin in my tests.

will make a few BD and see the results ;)

[QBhd]

I tackled this problem since MeGUI's calculator is broken and came up with some interesting results that allowed me to make up my own equations.

http://i.imgur.com/iGe9Uki.png

That is remuxing with just a video stream.

http://i.imgur.com/VwhW5pG.png

This is the overhead "added" when the audio stream is DTS-HDMA (m2ts - audio - video - video overhead) again a linear relationship with bitrate.

regular DTS is a constant:

http://i.imgur.com/WENxO9q.png

Using these I was able to come up with a calculator that can get me consistently a 99%+ burned disc.

QB