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Old September 12th, 2003, 12:01 PM   #1
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HELP! This is weird

Hi everyone,

So I dump my commentary (under one hour and 50 minutes) to a quicktime movie and re-import the 300 mb file back in. I go to compress it (3.0 mbps) and it's telling me it will be a 3.8 gb file. Huh? Is this based on how long it is, or what? Will it actually end up being that large? My movie is going to be 3.8 gb, so the commentary, doc, alternative scene and trailer need to be 400 mb total...

HELP!

heath
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Old September 12th, 2003, 12:47 PM   #2
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As I said in the other post I'm not sure what you're trying to do. You shouldn't ever make a QT movie from the timeline.

If you need audio just file>export>QT but then under options choose wav. Run that wav file through A.Pack to get your AC-3. If you need mpeg-2 then(render the timeline) file>export>QT and under options choose mpeg-2 and set your settings. Take those files into dvdsp and you're off and running.

Even if you do use a 3rd party encoder(BitVice, Compessor, Procoder etc) then export a FCPro ref movie and encode that but dont export a mov if you can help it.

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Old September 12th, 2003, 12:51 PM   #3
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So, does it need to be mpeg2, the audio? Also, can the commentary be 32 khz instead of 48, like the movie?

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Old September 12th, 2003, 01:06 PM   #4
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Ok well just to confirm what you are going to do.

As I understand it, or how I would do it, is to have one mpeg-2 stream and two audio streams(AC-3 dolby streams made in A.Pack(comes with dvdsp))(for your main feature).

In dvdsp(1.5)(you're not there yet but still...), you'd drag your m2v into the gaphical view and then add the 'normal' audio track to the audio bin so you have a main feature track with it's audio track. Next you can add another audio stream(your commentary stream) to the main feature. Drag it to the same bin as you did before. Now you have one m2v with two AC-3 files.

So right now if you watched it you could hit the audio button and you would be able to jump from the 'normal' soundtrack to the commentary one and back.

Ok I'll help you get there if you let me know that that is what you're trying to do.

No keep it at 48 khz but you'll end up with very small files once you run the audio through A.Pack. I can give you settings for that if you want?

Jake
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Old September 12th, 2003, 01:16 PM   #5
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EXACTLY!

I'll keep everything in 48 khz, but what do I export the audio as? 16 bit .wav or 8 bit .wav? Do I make it an mpeg2?

I need to be able to put the feature, commentary, a 17:30 documentary and 5 minutes worth of extras onto one 4.7 gb DVD-r.

I'm compressing with FCP 3.0.4 and building the DVD in DVDSP 2.0.

Thanks,

heath
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Old September 12th, 2003, 01:34 PM   #6
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Sorry about this but I'm in the UK and gotta go. I'll help more later if I can or tomorrow morning uk time.

Read up on A.Pack as you'll need to use it.(it takes your wav's(PCM audio and makes them AC-3 dolby streams, much smaller than wav & aiff but same quality to you and me)

Keep you wav settings as high as poss. 16 bit etc as the compressing will be done in A.Pack.

In A.Pack for a stereo stream, drag your wav to the left and right channels.
Set the data rate to between 192 kbps & 224 kbps and you'll be fine. Also uncheck everything in the preprocessing tab.

If you've got dvdsp 2 then you've got Compressor so you should export out FCPro ref movies, with video only, and encode those in Compressor. 2-pass VBR for sure.

Jake
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Old September 12th, 2003, 01:36 PM   #7
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Oh and no. The audio will never be mpeg-2.

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Old September 12th, 2003, 02:35 PM   #8
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Thanks, Jake. I'm going to start compressing the commentary first. I am waiting for the audio to come back on the movie and then I have to send out the documentary and trailer's audio to be fixed, too. I probably won't start the main compression of the film and doc until sometime next week.

Tonight, I'm gonna do the DVDSP 2 tutorial to figure everything out.

FYI, everyone, DON'T do anything other than 16 bit and 48 khz, because it will sound like crap (esp. in 8 bit).

heath
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Old September 12th, 2003, 02:57 PM   #9
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An hour and 50 minutes @ 3.0 mbps resulting in 3.8 gb sounds
about right.
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Old September 12th, 2003, 02:59 PM   #10
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What about an 18 minute doc, 3 minute alternate scene and a 1:40 trailer? 3.0 mbps.

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Old September 12th, 2003, 03:04 PM   #11
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That's only 23 minutes. Lets round that up to 25 to give us a bit
more space.

Now the maximum size on a DVD-R is 4500 MB. If we divide the
4500 with 25 we get 180 MB. So the max we can use for each
minute of our footage if we want to stay within that boundary
is 180 MB. Lets lower that to 150 to get a bit more breathing
room.

150 divided by 60 (seconds per minute) is 2.5 MB/s. Now if
we multiply that by 8 we get a max datarate of 20 mbps which
DVD cannot handle. So for 25 minutes you can easily use 9 mbps
and still have room to spare, no problem (which would yield a
DVD well under the 2 GB).

Now again, this is the TOTAL datarate. Including ALL video,
audio & subtitles. If you have extensive (motion) menus you
need to take that into account as well.
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Old September 12th, 2003, 03:30 PM   #12
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That 25 minutes is added onto the 1 hour and 50 minute feature with a 1 hour and 50 minute seperate audio track (commentary). I'm pretty sure it can be done on a 4.7 gb DVD-r, um, right?

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Old September 15th, 2003, 01:59 PM   #13
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<<<-- Originally posted by Jake Russell : Ok I'll help you get there if you let me know that that is what you're trying to do.
Jake -->>>

Hey Jake,

Haven't heard back from you about compressing my film, audio commentary (alternate audio track), and 25 minutes of extras onto one DVD-R.

Thanks!

heath
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Old September 16th, 2003, 01:23 PM   #14
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Not sure what other info you need really. It's all pretty much been covered over the two posts.

Use compressor for encoding your footage, if not use the new QT encoder which has 2-pass VBR and if not that then the old QT encoder I guess as those are the encoders you have.

Use AC-3 audio files encoded in A.Pack from wav files.

Thats kind of it. You are really gonna be pushing the dvd-r limit and you'll have to play with the bitrate to get a pic quality you can live with.

If you have questions ask but loads have been answered,

Jake
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Old September 16th, 2003, 01:59 PM   #15
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Compressor is a seperate program that was installed when I put in DVDSP 2...So, my question is, when I change my preferences in DVDSP 2 to a bitrate of 3.3, etc., does that automatically transfer to Compressor? Or do I compress within DVDSP 2? (I have FCP 3, so I'm not using that mpeg2 compression.)

THANKS!

heath
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