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bit rate calculations
I posted this on the dvd authoring forum and the dvd studio pro forum and got no replies. Anyone here have any advice?
I’m authoring my first dvd. I know this has been addressed before, but I can’t find the exact answer I need. My program is very large, probably 3+ hours of video. I will be outputting to a dual layer dvd. In calculating the bit rate, do I calculate the video and audio separately? ie; if I have 60 minutes of video tied to audio, do I calculate 120 minutes? Or 60? I know I need to calculate separate audio (like music) in addition to the A/V.
Also, I am editing on FCP, should I import through compressor? Or a by reference movie? I’ve done small tests as a by reference movie and it looks fine, but I am only testing in 10 minute segments.
One more question. Can I apply a different bit rate to different segments? Like give a higher bit rate to the feature and lower on the extras?
Lynne
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2 Replies
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Hi Lynne
To calculate the bit rate you musst add the video br + the audio br.
If your video is 6Mbps and your audio is 340Kbps, you have a 6,34Mbps stream.
This you apply to the total duration of the stream (not duration video+ duration audio).[marguu] “Can I apply a different bit rate to different segments”
Not problem. Each MPG2 can have a different bit rate.
In theory the best way should be to send to Compressor from the FC time-line. In the practice send a reff or autocontained movie is the same.
RafaelPPC G5 2x2Gh 4GbRAM/BlackMagic SD/PMBP 17″Core2Duo 4GbRAM
JVC DTV-17″/FCS2/AE CS3/COMBUSTION/SHAKE -
Also, there is a great bit rate calculator that i use all the time(created by an old prof. of mine!) on kenstone.net
https://www.kenstone.net/fcp_homepage/bit_budget.html
Mike Daniels
1st Assistant Editor
VICE Films/VBS.TV
https://www.vbs.tv
https://www.myspace.com/vbstv
https://www.youtube.com/vbstv
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