For encoding files losslessly, I use WavPack 4.31 (the latest version), with the -m (compute & store MD5 signature of raw audio data) included on the command line.
I've encoded all my files with the same command line, and I replaygain the album, so that it looks something like this in foobar2000 when I click "properties":
replaygain_track_gain = -7.77 dB
replaygain_album_gain = -8.29 dB
replaygain_track_peak = 0.977233
replaygain_album_peak = 0.977386
index = 45864
samplerate = 44100
channels = 2
bitspersample = 16
format = Integer
codec = WavPack
bitrate = 860
compression = Lossless
Today I encoded a few more albums, I checked the "properties" in foobar2000 again and here is what I got:
samplerate = 44100
channels = 2
bitspersample = 16
format = Integer
codec = WavPack
version = 4
bitrate = 928
compression = Lossless, High
original MD5 = 956b378c6220394fbe0bbd14e544c707
referenced_file = 謝霆鋒 - 黃 - Disc 2.wv
replaygain_track_gain = -8.85 dB
replaygain_track_peak = 0.973724
replaygain_album_gain = -9.17 dB
replaygain_album_peak = 0.988708
The difference is that the files encoded today have these displayed in the file's properties:
version = 4
compression = Lossless, High
original MD5 = 956b378c6220394fbe0bbd14e544c707
referenced_file = 謝霆鋒 - 黃 - Disc 2.wv
Is there some reason that my previous files don't display this information?