DTS audio compression lossy?
At the company where I work we always use Linear Pulse-Code Modulation to record audio, we mostly do it for archival purposes these days. I personally do not do much mastering, I usually just do the recording work. For the past year or so, however, I have been remastering audio from original analog recordings into 8.1 LPCM at 24 bits and 48kHz. Such files always have the same bit rate of 9216 kbps. This is „true“ lossless audio (personally, I would not have called such audio lossless, but according to regulations, it is).
Well, long story short, the other day I got to preview a documentary, which has some of our archival footage in it. It has a respectable 8.1 DTS-HD Master Audio track at 3741 kbps (48kHz/24-bit), and from what I've heard it should sound exactly the same as any 8.1 LPCM track at 9216 kbps. However, I did notice a significant difference in audio quality in scenes with archival footage. Eventually, I contacted the audio engineer who had been working on this thing and he said that he simply cut and pasted the original files that I provided to him into the time line. He said that it must have been a compression artefact. But as far as I know DTS Master Audio is not supposed to have any compression artefacts, so has anyone else ever noticed anything like this? And is DTS-HD MA truly lossless?