IPB

Welcome Guest ( Log In | Register )

Flac - Mono Vs. Stereo
Azevedo
post Oct 20 2012, 13:59
Post #1





Group: Members
Posts: 100
Joined: 3-November 08
Member No.: 61632



Hey everyone,

I have this audio source in stereo FLAC+CUE and used CUETools (libflake max compression) to split the CUE/FLAC into single tracks
Then, AS THE ORIGINAL CD IS MONO I converted the STEREO FLAC to MONO FLAC using sox:

sox.exe stereo.flac -C 8 mono.flac channels 1

The results:

Stereo:

CODE
Format                                   : FLAC
Format/Info                              : Free Lossless Audio Codec
Duration                                 : 3mn 22s
Bit rate mode                            : Variable
Bit rate                                 : 507 Kbps
Channel(s)                               : 2 channels
Sampling rate                            : 44.1 KHz
Bit depth                                : 16 bits
Stream size                              : 12.2 MiB (99%)
Writing library                          : Flake#0.1


Mono:

CODE
Format                                   : FLAC
Format/Info                              : Free Lossless Audio Codec
Duration                                 : 3mn 22s
Bit rate mode                            : Variable
Bit rate                                 : 353 Kbps
Channel(s)                               : 1 channel
Sampling rate                            : 44.1 KHz
Bit depth                                : 16 bits
Stream size                              : 8.51 MiB (100%)
Writing library                          : libFLAC 1.2.1 (UTC 2007-09-17)



Now I have these questions for you folks:

1. After these operations, the mono Flac audio still losslessly 'original'?
2. Why didn't I get 50% space saving when using -C 8 compression level?
3. Is it recommend to scan replay gain and store int on the flac's tag?
4. Is it recommended to encode flac audio in mono out of DUAL MONO?
I mean, dual mono isn't it such a waste?



Thanks

This post has been edited by Azevedo: Oct 20 2012, 14:48
Go to the top of the page
+Quote Post
 
Start new topic
Replies
Azevedo
post Oct 20 2012, 16:03
Post #2





Group: Members
Posts: 100
Joined: 3-November 08
Member No.: 61632



QUOTE (chi @ Oct 20 2012, 12:22) *
FLAC exploits similarities between stereo channels. So, when you hand it a “stereo” file that’s actually dual mono, it will essentially compress the second channel down to nothing.


Thanks chi. So let's see if i get it. Flac compress stereo like "joint stereo"? It has a mono stream with stereo differences L/R to produce the stereo from the mono?
Go to the top of the page
+Quote Post
tuffy
post Oct 20 2012, 16:15
Post #3





Group: Members
Posts: 119
Joined: 20-August 07
Member No.: 46367



QUOTE (Azevedo @ Oct 20 2012, 10:03) *
Thanks chi. So let's see if i get it. Flac compress stereo like "joint stereo"? It has a mono stream with stereo differences L/R to produce the stereo from the mono?

That's pretty much it. For 2 channel streams, FLAC encoders will try left/difference, difference/right, average/difference and independent, and will use the combination that makes the smallest frame.
Go to the top of the page
+Quote Post

Posts in this topic


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



RSS Lo-Fi Version Time is now: 26th November 2014 - 18:26