file sizes....

[drummerduck]

this maybe one of those questions that cannot be answered........?

Or that there is no real answer, but here it is.

When you have to convert your video, and you choose a high bit rate, how do you know that the audio will fit onto the dvd as well....

I have a feeling i may have asked a stupid question? or that i have worded it the wrong way. If you do not ENCODE the audio and video together how can you work out the overall file size so it fits onto a 4.7G dvd.

cheers.

D

[bugster]

Use a bitrate calculator, they will take into account the bitrate required for both audio and video. The java one on this site works well for me.

[Gazorgan]

Good question.

Audio is easy, it's a fixed bitrate (usually). So say you have a 384 kbps AC5.1 sound track for a 90 minute movie. This takes up

384 kbps x 90 minutes x 60 seconds/minute x 1/8 bits/byte x 1 MB/1024 Kbytes = 168.75 MB.

Piece-o-Cake. Take your 4.3 GB (not 4.7, trust me on this) and subtract out the audio. Leave in 50 MB for overhead and you get the maximum size the video can be. Drop that into you encoder, allow 2% error(no encoder is perfect) and you can set your video bitrates to match the disk size.

This is basically you you get those 700 MB DivX files, same logic.