MPEG-1 Layer 2 audio streams selection

[Garet_Jax]

I recently received a file with following specification (GSpot 2.51 beta2):

Container:
CDXA << MPEG-1 System Stream << {1 vid, 1 aud }

video codec
type: MPEG1_Payload
name: MPEG-1

audio codec
codec: MPEG-1 Layer 2
Info: 0xc0:44100Hz CBR 224 kb/s total (2 chnls)

It also says that it is an VCD file.

On those two audio channels the file have two different languages. Unfortunately BSplayer shows only (audio -> audio streams):
Stream(C0)

By default it plays both channels, the only way to change this is to go to filters and in MPEG Audio Decoder which is identified as:

MPEG Audio Decoder
Location: C:\WINDOWS\System32\
quartz.dll, Size: 1250304 bytes, Version 6.5.1.902

CompanyName: Microsoft Corporation
FileDescription: DirectShow Runtime.
FileVersion: 6.05.01.0902
InternalName: Quartz.dll
LegalCopyright: Copyright (C) 1992-2001 Microsoft Corp.
LegalTradeMarks: Copyright (C) 1992-2001 Microsoft Corp.
OriginalFilename: Quartz.dll
ProductName: DirectShow
ProductVersion: 6.05.01.0902
Comments: 6.05.01.0902

change options from "channel - both" to "channel - first" or "channel - second" (note: this is translation from polish so it may differ from original)

It would be so cool if there were an option to choose channels as in ogg files. (for example: audio -> audio streams -> Stream(C0) -> first, second, both)
^_^

[Quietseb]

If I read correctly, those 2 channels are those usually used for stereo... it's 1 audio streams with 2 channels, left and right. Hence bsplayer detection is normal

I suppose you only need to change the balance of your audio output, if it's quicker than change the decoder settings.

=> if my reasoning is correct, your suggestion would be to add balance control to bsplayer

[Garet_Jax]

Originally Posted by Quietseb

If I read correctly, those 2 channels are those usually used for stereo... it's 1 audio streams with 2 channels, left and right.

yes, and no. Normally I would think the same. But look at the decoder options (under "filters" in BSPlayer). This time a full text:

audio MPEG 1 decoder

*sound quality:
bla bla bla not important

*channel:
- first
- second
- both

*sound channels:
- stereo
- mono

*informations
*set as default

(all translated from polish)

so, it's not "channels left, right" but "one, two", also there is an option to choose stereo or mono.
The conclusion is: this is normal for VCD movies to have one stream and two channels with different audio. Or am I wrong? (don't know much about VCD movies)

Originally Posted by Quietseb

Hence bsplayer detection is normal

yeah, that's why I put it into request section.

Originally Posted by Quietseb

I suppose you only need to change the balance of your audio output, if it's quicker than change the decoder settings.

nope.

Originally Posted by Quietseb

=> if my reasoning is correct, your suggestion would be to add balance control to bsplayer

nope.

Also, when I use
- "both" - I hear in left speaker one language, in right other language
- "one" or "two" - one language goes to b o t h speakers, I don't know if "stereo/mono" option works, cause this movie don't have many situations where you could hear a difference :/

[bst]

Could you provide some sample file ?
A few secs is enough.
You can upload it to
ftp ftp.bsplayer.org
login/pass: bsp/upload

[Garet_Jax]

Done!

filename is GaretJax - Taiji - audio test.mpg

It behaves exactly the same way as decribed above.

One channel is original chinese voice, other is chinese dubbing.
(note: chinese != chinese)

Have fun learning Tai Chi :P

[bst]

ok thx, we'll add option to choose which channel to decode in next build.

[Garet_Jax]

:D