[henryperu77]

I just checked the original .aac file with mediainfo

Audio
Format : AAC
Format/Info : Advanced Audio Codec
Format version : Version 2
Format profile : HE-AAC / LC
Bit rate mode : Variable
Minimum bit rate : 106 Kbps
Maximum bit rate : 205 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz / 24.0 KHz
Compression mode : Lossy
Stream size : 10.1 MiB (100%)

But when i do the same on the resulted mp4 the audio its different, the bitrate is low

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : HE-AAC / LC
Codec ID : 40
Duration : 22mn 7s
Bit rate mode : Variable
Bit rate : 62.7 Kbps
Maximum bit rate : 64.1 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz / 24.0 KHz
Compression mode : Lossy
Delay relative to video : -3s 754ms
Stream size : 9.92 MiB (1%)

Was the audio reencoded with ffmpeg ??

*This was from the Scrubs HD sample*