100GB Blu-ray compression to 50GB(calculating)

[infinitesyrup]

Hello,
I'm trying to compress a the movie that i own for The Lion Kind 2019.
I have backed up all of its content to my computer and saw the bitrate of it.
The thing is my calculations of reducing it has been wrong and it costed me long night of electricity...
I want to fit it into a 50GB disc which as know can only be filled up with 46.1GB total MAX.

I simply just want to my own subtitles to the movie and keep all it's menus and everything.

What are the necesarry parameters for my to include on my calculations ?
I don't want to touch anything else rather then the bitrate.
All HDR metadata and all everything will remain the same, just a diffrent bitrate parameter that will fit a 50GB of disc..

The thing is, I have 35 more physical movies to do it on, so how do i make my calculations precise?

I have uploaded the BDINFO report here:
https://pastebin.com/P7vdbX4B

Thanks in advance and please, I would kindly request not to respong with negative comments as..I do am just need some guidings and help thats all..

[huhn]

don't forget that there is like 8000kbit audio in there so halving the bit rate of the video stream will not even remotely get you close to where you want to be.

so it is data you know that stays as is 45gb minus that audio und other stuff and here you start to go.

[infinitesyrup]

Originally Posted by huhn

don't forget that there is like 8000kbit audio in there so halving the bit rate of the video stream will not even remotely get you close to where you want to be.

so it is data you know that stays as is 45gb minus that audio und other stuff and here you start to go.

Yes, you are right. I have added it in consideration for the resulted video bitrate, to leave space to them aswell.
How is calculation though needs to be done?
I tried any Bitrate calculator software that i found here, none of them is for Blu-ray stracture..

[huhn]

there are other that are far far better at this then me.
the blu ray structure doesn't matter bit rate is bite rate.

don't fall for bytes and bits traps.

[GeoffreyA]

You can try my old bitrate calculator. Unfortunately, it doesn't support multiple audio tracks, nor has any concept of Blu-ray structure. Perhaps work out just the video bitrate, adding the size of the audio tracks manually, say with Windows Calculator, to get something below your 46 GB target, to leave space for overhead.

https://github.com/GeoffreyAA/bitme

[Emulgator]

BD-50 = BD-R 50: 24.438.784 Sectors * 2.048 Bytes/Sector = 50.050.629.632 Bytes * 8 bits/Byte = 400.405.037.056 bits
BD-RE50: 23.652.352 Sectors * 2.048 Bytes/Sector = 48.440.016.896 Bytes * 8 bits/Byte = 387.520.135.168 bits
- UDF 2.50 Margin (491 Sectors)
- BD Folder Structure Files Overhead -0,05%
- Safety Margin (-2%)
- .m2ts Container overhead (-4,75%)
= Available Disc Space (~373.000.000.000 / 360.000.000.000 bits)

Add all Tracks of Audio Bitrates (this is the 2nd place to shave off bits)
Add all Tracks of Subpicture Bitrates (6300bps each)
Multiply them with Feature Playing Time ???? s
= Feature Audio+Sub Bit Budget

Add all Tracks of Menu Audio Bitrates
Add all Tracks of Menu Subpicture Bitrates (6300bps each)
Add Menu Video Bitrates ()
Multiply them with Menu Playing Time ?? s
= Menu Bit Budget

Available Disc Space
-Feature Audio+Sub Bit Budget
-Menu Bit Budget
= Feature Video Bit Budget

Feature Video Bit Budget / Feature Playing Time = Remaining Video Bitrate, the first place where you intend to shave off bits.

As huhn mentioned, you will be having a hard time to get this stuffed into a 50GB disc while leaving high-bitrate audio untouched.
Ah, just read the BDInfo report. 00055.m2ts had used 68,77Mbps in total, 54.29Mbps for HEVC Video. Should be possible though.

[FranceBB]

Originally Posted by GeoffreyA

You can try my old bitrate calculator. Unfortunately, it doesn't support multiple audio tracks.

Seems to be working, but the main limit is the artificial 8 Mbit/s audio track bitrate limit.



In this case the difference is that 1 PCM 24bit 48000Hz audio track is 1152 kbit/s, so if you have 8 tracks you have 8*1152 which is 9216 kbit/s, but from the GUI you can only choose up to 8 Mbit/s. This is why the actual size is off.

Digging in the source, I noticed that this was set in BitMeDlg.cpp, so I changed it to:

Video.SetRange(0, 900000, FALSE); // 900000 = 900 Mbps
Audio.SetRange(0, 20000, FALSE); // 20000 = 20 Mbps

so that it can now support things like XAVC Intra Class 480 which would be 800 Mbit/s at 50p and more than 16 PCM 24bit 48000Hz audio tracks (16 PCM 1 so 1152 kbps per track which would make it 18432 kbps).

I've also changed

Video.SetPageSize(500);
Audio.SetPageSize(128);

to make stepping through the slide at high bitrates a bit more bearable.



The rest of the time was me trying to figure out how to build on Visual Studio 2026 as I had to remove the references to Build.c from BitMe.vcxproj as it used to be Radiance -> Build.c -> Build.obj but that's no longer allowed so obviously it was failing. I've changed

<PreLinkEvent>
<Command>$(OutDir)Radiance.exe

cl /nologo /c /Zl /Fo$(OutDir) Build.c</Command>
<Message>Incrementing build number</Message>
</PreLinkEvent>

to

<PreLinkEvent>
<Command>cmd /c ""$(OutDir)Radiance.exe""</Command>
<Message>Incrementing build number</Message>
</PreLinkEvent>

as well as the reference from Radiance.cpp (I'm talking about):

const char sBuildSrcFile[] = "Build.c";

removed the additional dependencies from the linker



and created a new BuildInfo.cpp file as a replacement now that Build.c is gone and will not be generated.

//Replacement for legacy Radiance-generated Build.c

extern "C"
{
int build_number = 0;
__int64 build_time = 0;
}

and it worked.

Pull request is here in case you wanted to merge. If not, it's fine, I had fun anyway. https://github.com/GeoffreyAA/bitme/pull/1

Nice little program, Geoffrey, I'm sure I'll use it regularly as it comes in handy.

[GeoffreyA]

Thanks, FranceBB, for giving it a go, and looking at the regrettably messy code!

I haven't extended it in years, being lazy, but there is quite a bit of scope to take it further. The source code, as you doubtless saw, is in need of reorganisation and cleaning: too much is commented out from the time I tried to add an overhead system based on video and audio codecs. The idea was to look at the specs of each format and compute the exact overhead. The latter was madness, so I used a simpler approach, encoding a range of files in FFmpeg, subtracting the actual file sizes from the "ideal" calculation, and stashing the numbers in the "container interfaces."

Apologies for the messy dependency on Radiance. This project came from Visual Studio 6.0, and that system was set up to create an incremental build number upon compilation. It does tie the program in a bad way to the Visual Studio configuration. In November, I migrated the project to VS2026, first going through VS2019 to import the legacy DSP. It worked and I compiled that release with 2026. It should have opened and compiled for you without issue, but I suppose I must have missed something in the configuration, or got some path wrong. Most settings went over all right but I had to change a lot manually.

Thanks for the pull request. When I get a chance, I'll merge your changes. Probably the best approach is to remove Radiance, but I have got used to having the build number and time in that format. The code should be cleaned up, and moved to C++11. I'll have to look at it seriously now.

***

Edit: The only place the Radiance-generated build number and time are referenced is in BitMe/Application.cpp:

extern "C" const int build_number;
extern "C" const time_t build_time;

So in fact, one could just alter it there and that would be it, apart from the project settings.

From Application.h, the numbers are exposed to the rest of the program by GetBuildNumber() and GetBuildTime(). The reason I did it like this was that, upon including the incremented build number straight into the source after compilation, it used to think that something had changed, and would recompile when one hit Run. Plus, in VS6, there was no automated way to get an incremented build number. Nor was the __TIME__ macro ideal for formatting the date based on the computer's regional settings.

[FranceBB]

Originally Posted by GeoffreyA

too much is commented out from the time I tried to add an overhead system based on video and audio codecs.

Oh, it's fine, I have a lot of commented out stuff in plenty of my other repositories as well, I didn't really mind.

Originally Posted by GeoffreyA

The idea was to look at the specs of each format and compute the exact overhead. The latter was madness, so I used a simpler approach, encoding a range of files in FFmpeg, subtracting the actual file sizes from the "ideal" calculation, and stashing the numbers in the "container interfaces."

Empiric approach but actually surprisingly effective as I tried a few different mxf combinations and it seems to be ok.

Originally Posted by GeoffreyA

It worked and I compiled that release with 2026. It should have opened and compiled for you without issue, but I suppose I must have missed something in the configuration, or got some path wrong.

What I think happened is that it reused the Build.c that was already there, but it definitely didn't generate a new one, which of course is a problem if you start with Visual Studio 2026 and the file has never been there in the first place xD

Originally Posted by GeoffreyA

Thanks for the pull request. When I get a chance, I'll merge your changes.

Cool.
In the meantime, I tried on my beloved Windows XP and sure enough it happily runs.

[SeeMoreDigital]

I wonder how many 4K UHD 2 hour (or so) movies would fit onto 50GB disc after all the bloat content has been removed?

[wonkey_monkey]

Originally Posted by SeeMoreDigital

I wonder how many 4K UHD 2 hour (or so) movies would fit onto 50GB disc after all the bloat content has been removed?

Ideally, one.

[GeoffreyA]

Originally Posted by FranceBB

Empiric approach but actually surprisingly effective as I tried a few different mxf combinations and it seems to be ok.

What I think happened is that it reused the Build.c that was already there, but it definitely didn't generate a new one, which of course is a problem if you start with Visual Studio 2026 and the file has never been there in the first place xD

Cool.
In the meantime, I tried on my beloved Windows XP and sure enough it happily runs.

Actually, I must try to update all those overhead values, FFmpeg's muxers having changed considerably these past few years.

I have an inkling that it could have been spaces in the project path causing Radiance not to run. I'll try this when at the computer. It did happen before, if I remember correctly. (EDIT: It was spaces. I fixed it by adding double-quotes and escaping the trailing slash to the /Fo$(OutDir) parameter of the CL command. Just quotes does not work. This helped. So Radiance should work as usual even if there are spaces in the project's path. VS6 never had this issue.)

Fantastic. Knowing your love for XP, I was going to ask you to give it a go, so that's good news. It's fortunate VS2026 didn't remove XP targeting. The zipped release from Github has the XP build as BitMe32.exe, whereas the other is the non-XP x64 build.

[FranceBB]

Originally Posted by GeoffreyA

Actually, I must try to update all those overhead values, FFmpeg's muxers having changed considerably these past few years.

Uhmmm the FFMpeg mxf muxer is flawed and it constantly breaks. I've been reporting compatibility issues for years, for instance for H.264 and for MJPEG2000 the tickets are still open and there are other things which also need to be addressed. I know that Karl and Tomas have been routinely fixing issues, but it's generally just a matter of time before someone submits another seemingly innocent patch and it ends up breaking compatibility. I've had horrible experiences with MPEG-2 streams muxed by the FFMpeg open source mxf muxer. On top of that, it muxes the audio as Frame AES instead of Frame BWF. Anyway, what I'm currently using to mux everything in mxf is the BBC BMX muxer.
Old repository (before Philip retired): https://github.com/ebu/bmx
New repository: https://github.com/ebu/bmx

It's not just an mxf muxer, it's "the" mxf muxer so much so that libMXF++ has become the foundation of lots of other muxers.

it's free, open source, cross platform and works reliably.

I also use ommcp from Harmonic which is the omneon muxer as we have Omneon hardware playback ports over here and it can do interesting things like trimming without re-encoding and adding a pre-charge value for non Intra codecs etc but anyway that one is not free, it's proprietary and only those who pay the license have access to the source code (and even that one is only the source code of ommcp, ommq etc but not the source code of the actual library, libommedia, which is the one doing the heavy lifting).

[GeoffreyA]

Thanks, FranceBB, for the useful information as always. I gave BMX a try, and improved my MXF overhead number. Not quite spot on but nearer.

[SeeMoreDigital]

Originally Posted by SeeMoreDigital

I wonder how many 4K UHD 2 hour (or so) movies would fit onto 50GB disc after all the bloat content has been removed?

I've just noticed that my 4K UHD Dolby Vision [MEL] back-up of James Bond Casino Royale which has a runtime of 138mins comes in at 48.6GB.

General
ID                                       : 0 (0x0)
Complete name                            : \\DXP2800-C670\My Movies\[4K] UHD Movies\Action & Adventure Movies\James Bond [2006] Casino Royale 138mins (48.6GB) MEL\AVCHD\BDMV\STREAM\00000.m2ts
Format                                   : BDAV
Format/Info                              : Blu-ray Video
File size                                : 48.6 GiB
Duration                                 : 2 h 24 min
Overall bit rate mode                    : Variable
Overall bit rate                         : 48.1 Mb/s
Maximum Overall bit rate                 : 128 Mb/s
Frame rate                               : 23.976 FPS

Video #1
ID                                       : 4113 (0x1011)
Menu ID                                  : 1 (0x1)
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5.1@High
HDR format                               : SMPTE ST 2086, HDR10 compatible
Codec ID                                 : 36
Duration                                 : 2 h 24 min
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 2)
Bit depth                                : 10 bits
Color range                              : Limited
Color primaries                          : BT.2020
Transfer characteristics                 : PQ
Matrix coefficients                      : BT.2020 non-constant
Mastering display color primaries        : Display P3
Mastering display luminance              : min: 0.0001 cd/m2, max: 1000 cd/m2

Video #2
ID                                       : 4117 (0x1015)
Menu ID                                  : 1 (0x1)
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5.1@High
HDR format                               : SMPTE ST 2086, HDR10 compatible
Codec ID                                 : 36
Duration                                 : 2 h 24 min
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 2)
Bit depth                                : 10 bits
Color range                              : Limited
Color primaries                          : BT.2020
Transfer characteristics                 : PQ
Matrix coefficients                      : BT.2020 non-constant
Mastering display color primaries        : Display P3
Mastering display luminance              : min: 0.0001 cd/m2, max: 1000 cd/m2

Audio
ID                                       : 4352 (0x1100)
Menu ID                                  : 1 (0x1)
Format                                   : DTS XLL
Format/Info                              : Digital Theater Systems
Commercial name                          : DTS-HD Master Audio
Muxing mode                              : Stream extension
Codec ID                                 : 134
Duration                                 : 2 h 24 min
Bit rate mode                            : Variable
Channel(s)                               : 6 channels
Channel layout                           : C L R Ls Rs LFE
Sampling rate                            : 48.0 kHz
Frame rate                               : 93.750 FPS (512 SPF)
Bit depth                                : 24 bits
Compression mode                         : Lossless

Text #1
ID                                       : 4768 (0x12A0)
Menu ID                                  : 1 (0x1)
Format                                   : PGS
Codec ID                                 : 144

Text #2
ID                                       : 4769 (0x12A1)
Menu ID                                  : 1 (0x1)
Format                                   : PGS
Codec ID                                 : 144
Duration                                 : 2 h 24 min
Delay relative to video                  : 2 s 753 ms

And my 4K UHD Dolby Vision [FEL] back-up of Black Panther [2018] which has a runtime of 134mins comes in at 54.6GB. But it also has an 8-ch DD+ audio stream and an 6-ch Dolby Digital audio stream that could be removed...

General
ID                                       : 1 (0x1)
Complete name                            : \\DXP2800-C670\My Movies\[4K] UHD Movies\DC & Marvel Movies\Black Panther [2018] 134mins (54.6GB) FEL\AVCHD\BDMV\STREAM\00000.m2ts
Format                                   : BDAV
Format/Info                              : Blu-ray Video
File size                                : 54.6 GiB
Duration                                 : 2 h 14 min
Overall bit rate mode                    : Variable
Overall bit rate                         : 58.1 Mb/s
Maximum Overall bit rate                 : 35.5 Mb/s
Frame rate                               : 23.976 FPS

Video #1
ID                                       : 4113 (0x1011)
Menu ID                                  : 1 (0x1)
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5.1@High
HDR format                               : SMPTE ST 2086, HDR10 compatible
Codec ID                                 : 36
Duration                                 : 2 h 14 min
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 2)
Bit depth                                : 10 bits
Color range                              : Limited
Color primaries                          : BT.2020
Transfer characteristics                 : PQ
Matrix coefficients                      : BT.2020 non-constant
Mastering display color primaries        : Display P3
Mastering display luminance              : min: 0.0001 cd/m2, max: 1000 cd/m2

Video #2
ID                                       : 4117 (0x1015)
Menu ID                                  : 1 (0x1)
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5.1@High
HDR format                               : SMPTE ST 2086, HDR10 compatible
Codec ID                                 : 36
Duration                                 : 2 h 14 min
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 2)
Bit depth                                : 10 bits
Color range                              : Limited
Color primaries                          : BT.2020
Transfer characteristics                 : PQ
Matrix coefficients                      : BT.2020 non-constant
Mastering display color primaries        : Display P3
Mastering display luminance              : min: 0.0001 cd/m2, max: 1000 cd/m2

Audio #1
ID                                       : 4352 (0x1100)
Menu ID                                  : 1 (0x1)
Format                                   : MLP FBA AC-3 16-ch
Format/Info                              : Meridian Lossless Packing FBA with 16-channel presentation
Commercial name                          : Dolby TrueHD with Dolby Atmos
Muxing mode                              : Stream extension
Codec ID                                 : 131
Duration                                 : 2 h 14 min
Bit rate mode                            : Variable
Bit rate                                 : 640 kb/s
Maximum bit rate                         : 7 134 kb/s
Channel(s)                               : 8 channels
Channel layout                           : L R C LFE Ls Rs Lb Rb
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Compression mode                         : Lossless
Stream size                              : 616 MiB (1%)
Service kind                             : Complete Main
Number of dynamic objects                : 13
Bed channel count                        : 1 channel
Bed channel configuration                : LFE
Dialog Normalization                     : -27 dB
compr                                    : -0.56 dB
dynrng                                   : -0.42 dB
cmixlev                                  : -3.0 dB
surmixlev                                : -6 dB
dmixmod                                  : Lo/Ro
ltrtcmixlev                              : -3.0 dB
ltrtsurmixlev                            : -4.5 dB
lorocmixlev                              : -3.0 dB
lorosurmixlev                            : -4.5 dB
dialnorm_Average                         : -27 dB
dialnorm_Minimum                         : -27 dB
dialnorm_Maximum                         : -27 dB

Audio #2
ID                                       : 4353 (0x1101)
Menu ID                                  : 1 (0x1)
Format                                   : E-AC-3
Format/Info                              : Enhanced AC-3
Commercial name                          : Dolby Digital Plus
Format profile                           : Blu-ray Disc
Muxing mode                              : Stream extension
Codec ID                                 : 132
Duration                                 : 2 h 14 min
Bit rate mode                            : Constant
Bit rate                                 : 1 024 kb/s
Channel(s)                               : 8 channels
Channel layout                           : L R C LFE Ls Rs Lb Rb
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Compression mode                         : Lossy
Stream size                              : 986 MiB (2%)
Service kind                             : Complete Main
Dialog Normalization                     : -27 dB
compr                                    : -8.16 dB
cmixlev                                  : -3.0 dB
surmixlev                                : -6 dB
dmixmod                                  : Lo/Ro
ltrtcmixlev                              : -3.0 dB
ltrtsurmixlev                            : -4.5 dB
lorocmixlev                              : -3.0 dB
lorosurmixlev                            : -4.5 dB
dialnorm_Average                         : -27 dB
dialnorm_Minimum                         : -27 dB
dialnorm_Maximum                         : -27 dB

Audio #3
ID                                       : 4354 (0x1102)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : 129
Duration                                 : 2 h 14 min
Bit rate mode                            : Constant
Bit rate                                 : 640 kb/s
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Compression mode                         : Lossy
Delay relative to video                  : 31 ms
Stream size                              : 616 MiB (1%)
Service kind                             : Complete Main
Dialog Normalization                     : -27 dB
compr                                    : -0.56 dB
dynrng                                   : -0.28 dB
cmixlev                                  : -3.0 dB
surmixlev                                : -6 dB
dmixmod                                  : Lo/Ro
ltrtcmixlev                              : -3.0 dB
ltrtsurmixlev                            : -4.5 dB
lorocmixlev                              : -3.0 dB
lorosurmixlev                            : -4.5 dB
dialnorm_Average                         : -27 dB
dialnorm_Minimum                         : -27 dB
dialnorm_Maximum                         : -27 dB

Text
ID                                       : 4768 (0x12A0)
Menu ID                                  : 1 (0x1)
Format                                   : PGS
Codec ID                                 : 144
Duration                                 : 2 h 14 min
Delay relative to video                  : 5 s 797 ms