[MEncoder-users] size of AC3

[Tomáš Bažant]

does it mean that AC3 is constant bitrate?

Abu Zaher wrote:
>> 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
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