What is the size of subtitles in Scenarist???

[coona]

Hello Guys,

does anybody know relation between total size of subtitles in .BMP files and the real size in .VOB files. Is there a way to calculate how much space I need when I know total size of BMPs??? For examle in my last project i need only 46 MB in authored VOBs instead of 400 MB in BMPs.

Any idea??

[robz]

Hi,

I'm just guessing here... but for each subtitle-bmp scenarist creates a 'subtitle.sp' file in the scenario-cache directory. These files are small... something like 4kb perhaps the sum of these sizes?

Robz

[coona]

Hello robz,

maybe you´re right. It is fact that vob files are always bigger than sum of *.m2v and *.ac3 files. Maybe i should make some tests and statistics to find out what is the ratio between "authoring" and "subtitle" part. Maybe the "authoring" part is constant and the only variable is size of subtitles. It may also depend on numbers of PGCs. Who can tell....

[screw]

My guess is that you can not say exactly how much your encoded subtitles will take, but this is really small size if compared to video and audio (of course, if you are not adding 10 subtitle streams). My calculations give me about 4-6 megabytes for encoded subtitle stream.
I tried to calculate final size, taking all data (video, audio and subtitle BMP files (BTW, I am using compressed BMP-s)), and get different results. The average multiplier was 1.02, but this is not very exact digit.

[coona]

Hi,

I did some tests and I got 10 different results :D :D .

I tried to do the same project with different number of subtitle streams, tried to strip subtitle stream from my authored project, and from originally authored project.

All I got from this testing was something between 3,5 and 8,96 KB per subtitle.

It seems like there is no exact conection between scenario file (*.scn), "encoded files" and size of BMPs.

@screw
What does it mean "compressed BMP-s". I thought that in VOB file BMPs are converted into "something" else - so why do you use these "compressed BMP-s"??

[robz]

Well... I also did some testing...

And after almost 2 hours of testing when I had finally finished typing my reply (which was concluding NOTHING because during all this I had forgotten what it was I wanted to calculate and how this was to prove anything about subtitle size) ... MY PC crashed... :(
Just before I could post it....

So..... now I'll just type the important bit again:
Did a test, concluded that subtitle size (in a scenarist generated VOB) is about 133% of the sum of the sizes of the (temporary) .sp files. Type of BMP doesn't seem to matter much.

By the way these were the VOB's in the mux_data directory.. I didn''t try creating DVD vobs. And the difference in file size of the VOB with subs and the one without was only about 2 MB (ca. 659 MB per vob)

Well... Makes you wonder...

Why does anyone want to know this?? (no real space saving possible here I think)

[screw]

@coona

By "compressed BMP" I mean subs in preparation stadio (I usually do them through MaestroSBT). I guess, that estimation about final size of DVD has to be done in this stage (before authoring), because when you have have loaded everything into Scenarist and encoded subs as well - why this is necessary to know the size of subs in the project? You see total size already, which actually matters.
I think that initial question was about estimation, how much of space subs will take in your final DVD just before authoring.

@robz

Yes, I agree, that subs take so small place on DVD, that you can not save any space ommiting them.

[coona]

You are right, almost ;).

All I wanted to know is what the size of my subtitles will be (before setting parameters in CCE). In Trilight´s guide there was written:

Now the part that is less precise is the subtitles. In my experience, I've found that they end up being compressed approximately 50% from the size they show up as on your hard drive. I don't remember what they were for "Double Jeopardy" but let's assume we see 150,900,736 bytes for the size of the sub BMP's on the hard drive. Divide this by 2 and you have 75,450,368 bytes. Just to give yourself some breathing room, let's subtract 80,000,000 from our current total.

But in my experience it took only something between 10-15% of size of BMPs. That is why I wanted to know if there is some exact way do find out total size of subtitles form total size of BMPs before setting up average bitrate in 2nd pass in CCE.
I guess that size of any subtitle is always the same (in my case exactly 202 KB in BMP). And if your results are right then "scenarist size" is about 5,3 KB (that means less than 3%). It seems to be huge difference :D :D .

And I think it is pitty to burn only 4,25GB instead of the full capacity of DVDR medium, isn´t it???

[oddyseus]

Guys, what I have concluded is that the required space per sub stream is about 2-3mbytes. Muxing space is 3% of the audio and video.

This means that for a movie having audio at 200mb u have to max your video at 4,147.8mb, this is 4,347,265,182bytes.