Info:


Format                           : AC-3
Format/Info                      : Audio Coding 3
File size                        : 355 MiB
Duration                         : 2h 35mn
Overall bit rate                 : 320 Kbps

Audio
Format                           : AC-3
Format/Info                      : Audio Coding 3
Duration                         : 2h 35mn
Bit rate mode                    : Constant
Bit rate                         : 320 Kbps
Channel(s)                       : 6 channels
Channel positions                : Front: L C R, Side: L R, LFE
Sampling rate                    : 48.0 KHz
Stream size                      : 355 MiB (100%)


--There are two BRRips in dual-audi hindi:
  Avatar 2009 BRRip H264 5 1 ch Dual Audio Hindi Eng by =rj8911 
  Avatar Bluray 720p Dual Audio Hindi Eng DjVikas 

--this is the audio track from =rj8911 release..
  both these have a duration of 2h 35m
  while if you see the other english prints like that of Secretmyths...
  their duration is 2h 41m...

--its because,
  PAL DVD Length is 2h 35m
  Blu-Ray Disc Length is 2h 41m


--So these are the only releases with time 2h 35m......

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Steps to add hindi audio to avatar:


1.Download any of the english prints that i have provided,according to your wish.

2.Download the hindi audio track 

3.Download MKVToolnix form here: 
http://www.softpedia.com/get/Multimedia/Video/Other-VIDEO-Tools/MKVToolnix.shtml

4.Open Mkvmerge from the MKVToolnix startmenu entry.

5.In the Input tab,click "add" and select the movie you have just downloaded..

6.Again click "add" and now add the hindi audio file you have downloaded.

7.Click "Start Muxing" and in no time [approx 130sec] you will have your dual audio avatar.


I'm Providing This for Those Users who are not able to download from the above mentioned two releases....