Is this file mono or steroe?

[8GuaWong]

http://rapidshare.com/files/239120153/s ... o.ac3.html

audacity showed this file as mono single channel but when i opend it up with mediainfo it shows 2 channel adobe audition as well

[kozikowski]

You got that from a Movie DVD, right? That's not a "sound file" like you're thinking. That's a surround transport stream and it could contain Dolby Surround 5.1, six audio channels, and PCM Stereo mixdown, two more audio channels of the same show at the same time. It could contain a mono mixdown, too. That's why all the tools seem to be schizophrenic. You need something that can read and manage Dolby AC3. That would not be Audacity.

Koz

[george13]

Hi,

I looked at your file. It could be a recording of a TV program on a dvr. It's a two channel ac3 224kbit/s. It's stereo but the two channels are almost identical, probably because the original TV program is mono. So you can leave it stereo or make it mono, it won't matter much.

[steve]

Hi,

I looked at your file. It could be a recording of a TV program on a dvr. It's a two channel ac3 224kbit/s. It's stereo but the two channels are almost identical, probably because the original TV program is mono. So you can leave it stereo or make it mono, it won't matter much.

Thanks George, you beat me to it

Code: Select all

Format : AC-3 
Format/Info : Audio Coding 3 
File size : 37.8 MiB 
Duration : 23mn 36s 
Overall bit rate : 224 Kbps 
Audio Format : AC-3 
Format/Info : Audio Coding 3 
Duration : 23mn 36s 
Bit rate mode : Constant 
Bit rate : 224 Kbps 
Channel(s) : 2 channels 
Channel positions : L R 
Sampling rate : 48.0 KHz 
Stream size : 37.8 MiB (100%) 

Opening it in Audacity 1.3.7 on Linux it comes up as a stereo file, though as George has said, the two channels are almost identical.

[8GuaWong]

You got that from a Movie DVD, right? That's not a "sound file" like you're thinking. That's a surround transport stream and it could contain Dolby Surround 5.1, six audio channels, and PCM Stereo mixdown, two more audio channels of the same show at the same time. It could contain a mono mixdown, too. That's why all the tools seem to be schizophrenic. You need something that can read and manage Dolby AC3. That would not be Audacity.

Koz

yup i got this file from a dvd. so what do i need to tell if this is mono or stereo? or how to tell if the sound on the dvd is mono or stereo?