tool and technique use for reduce file size with out harm quality ?

[chamarams]

I have found some video file in torrent good quality and small size there release group name
AAC-ChameE they reduce file size unbelievable how they done this Any one could you plz tell me how reduce size like this with out affect the quality I have try many more tools but still no good result what are the tool and technique use AAC-ChameE for this task??

http://torrentz.eu/search?f=AAC-ChameE

මේ ගොල්ලෝ file size එක අඩු කරන්න බවිත කරන tool මොනවද කියල දන්නවද
මම දන්නා හැම ටූල් එකම දල බැලුව මීට වඩා size එක ලොකු වෙනවා මිසක් අඩු වෙන්නේ නම් නැ
මම මුන්ගේ 350MB රෙසුලොසිඔන් 720 X 400 එකෙක් තව රෙසලුසිඔන් අඩු කරන්න ගිහින් 500X 200 file size එක
700MB උනා use කර handbraker ටූල් එක

 

[savindra]

check this one..

http://www.wjunction.com/13-tutorials-guides/48774-how-encode-movies-*700mb-300mb*-step-step.html

try karala nam naha....

 

[kosandpol]

they are using MKV format with x264 video codec AAAC audio codec. Thats why the small sizes.

 

[NB Diamonds]

hoyala balamu.

 

[dgvirajm]

mamath handbrake thama use karanne machn ...
samahara videos ehema karath adu wennaha ... (habai ara video tab eke Constant Quality kiyana eka wadi karama file size adu wenawa habai quality podda podda bahinawa)

thawa Format Factoryth use karanawa machn ... oya dekenma bari wunoth wade athaharala dannawa