I have a stereo file0.wav in 96KHz/24 bits with a duration of n samples (with no signal above 23kHz)
I will transform this file through various encoders :
- convert in PCM 48/24 with a good src, and then back to 96/24 file1.wav
- encode in Dolby AC3 stereo 448kbps, retransform it back to 96/24 file2.wav
- encode in DTS 754kbps, retransform it back to 96/24 file3.wav
- encode in MP3 386kbps, retransform it back to 96/24 file4.wav
- encode in MP3 192kbps, retransform it back to 96/24 in file5.wav
- encode in MP3 96kbps , retransform it back to 96/24 file6.wav
- encode in AAC 320kbps, retransform it back to 96/24 file7.wav
- and other encoders...
All wav files will then be cut to exact same duration of n samples, so to avoid the fixed packets length of some encoders.
I would like people to listen to the files and/or rate them without cheating.
So my question : when you have only those final wav files, is there any technical way to find in which encoder was used ?
- I know that, for some low bitrates, you can may measure a falling frequency response (missing high frequencies) but for the others ?
Thanks for any info.