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AC3 Lossless File?

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Hi, sorry if this question seems trivial, but I could not find an answer anywhere.


So, I have an AC3 file that came from a Dolby TrueHD stream. I didn't encode it, so I don't know how it was extracted.

This is the information output by MediaInfo:

Code:

General
Complete name                            : C:\Users\XXXX\Desktop\1.ac3
Format                                  : TrueHD / AC-3
File size                                : 402 MiB
Duration                                : 1h 27mn
Overall bit rate                        : 640 Kbps

Audio
Format                                  : TrueHD / AC-3
Mode extension                          : CM (complete main)
Format settings, Endianness              : Big
Muxing mode                              : After core data
Duration                                : 1h 27mn
Bit rate mode                            : Variable / Constant
Bit rate                                : 640 Kbps
Maximum bit rate                        : 2 916 Kbps
Channel(s)                              : 6 channels
Channel positions                        : Front: L C R, Side: L R, LFE
Sampling rate                            : 48.0 KHz
Bit depth                                : 16 bits
Compression mode                        : Lossless
Stream size                              : 402 MiB (100%)

Wasn't AC3 supposed to be a lossy file with a 640 kbps bitrate?

However, I see there "Lossless" and "2916 kbps".

I really thought that you would need the thd+ac3 file to contain the lossless data.

Once again, sorry if this is a stupid question.

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