The track is a 5.1, 24bit, 192KHz (the max specs allowed by BD). It's a music mix that I'm obliged to use 'as is' but since it was made in another studio, I currently don't know the bitrate used.

27,648 kbps would be the maximum bitrate then.

Max. bitrate for TrueHD in BD is 18.64 Mbps (24.5 Mbps DTS-HD, 27.748 Mbps LPCM)

Wow, what a format. If the file needs more bitrate than that at any given point, then what happens with the data? Does it just get thrown away to conform to Blu-ray? Personally I'd be downsampling it to 96 khz. 6 channels of 192 khz is pointless.

Yes, that's kind of what I was referring to, and a codec that advertises as lossless being made slightly lossless to conform to standard bitrate is a lossy codec in that one instance. I doubt a 5.1 track at 24/192 would ever have an instance in a file to use that much bitrate. The LFE channel would be fairly low in bitrate, bass is easy to reproduce, and unless you are playing a different song from every other channel it should remain under the maximum bitrate. But still, I'd just go 24/96. I enjoy my 24/192 music in FLAC, but it's only stereo.

I agree too in the downsampling... but unfortunatly I'm forced to use it 'as is' without touching anything so I've no other choice :( Anyway, thanks for all your help!

I don't get why you CAN'T downsample it.

OTOH, couldn't you create an SD or 720p video stream :confused: so the total bitrate would be less of an issue...