General
Complete name                            : 04_aac_surround_48k.m4a
Format                                   : MPEG-4
Format profile                           : Apple audio with iTunes info
Codec ID                                 : M4A  (M4A /isom/iso2)
File size                                : 73.1 MiB
Duration                                 : 39 min 53 s
Overall bit rate mode                    : Constant
Overall bit rate                         : 256 kb/s
Writing application                      : Lavf61.7.100

Audio
ID                                       : 1
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 39 min 53 s
Bit rate mode                            : Constant
Bit rate                                 : 253 kb/s
Channel(s)                               : 6 channels
Channel layout                           : C L R Ls Rs LFE
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 72.3 MiB (99%)
Default                                  : Yes
Alternate group                          : 1