[MEncoder-users] size of AC3

[Abu Zaher]

> One more problem I found: is it possible to calculate the size (MB) of
> AC3 track in DVD without extracting it?
>

These facts are true for most of the dvds:

If the ac3 tract is 5.1 dolby surround, then it is 448 kbps.
It it is 2.0 dolby digital track then it is 192 kbps.
If it is a dts track then most probably 768 kbps

you can get these informations by playing the file with mplayer -v
option and looking at the verbose output,

after u get the audio kbps, and the total running time of the movie,
use this formula

total_size_of_audio (in MB) = (abitrate * time (in minutes) * 60 *
1000) / 8388608

for example if the running time is 100 minutes, and the ac3 track is
448 kbps, then the file size is:

( 448 * 100 * 60 * 1000 ) / 8388608 = 320 MB