24 bit LPCM audio not working

[sebarious70]

I created a BD image with a video .264 file and a Wave that is 24 bits 48 Khz. As far as I know, the Blu-ray spec allows for this.

But the resulting BD-RE, when burned and put in the blu-ray player, plays little else than white noise, and in the background you can hear some of the original audio, but for the most part it's loud white noise.

I considered the possibility that it might be a burning error, so I opened the ISO file with VLC, and it's the same thing. I also opened the source 24/48 audio file and it's fine, no white noise.

So I exported the audio again as wav, but this time as 16 bits / 96 Khz, dragged it into TS Muxer, created the ISO file again, and then the audio was perfectly fine.

So I wonder if TS Muxer doesn't allow for BD authoring with LPCM 24 bit audio. Is that the case? I cloned the code and opened the two files with the code that handle LCPM, which as far as I can tell are lpcmStreamReader.cpp and lpcmStreamReader.h. I don't know anything about programming, but the names make that obvious.

I did a search for 16 and I came to a point in the lpcmStreamReader.cpp file that maybe has something related to this. Of course, not knowing the first thing about code, I'm not sure what those actions are, but it's this part:

So this part tells me that if it's 16 bits, then it does something:

if (m_bitsPerSample == 16)
    {
        for (auto curPos = (uint16_t*)start; curPos < (uint16_t*)end; ++curPos) *curPos = my_htons(*curPos);
    }

And this part tells me that if the bit depth is higher than 16 bits, then it does something else.

else if (m_bitsPerSample > 16)
   {
       for (uint8_t* curPos = start; curPos < end - 2; curPos += 3)
       {
           uint8_t tmp = curPos[0];
           curPos[0] = curPos[2];
           curPos[2] = tmp;
       }

But that's just a guess.

So is it possible to author a BD with TS Muxer that has 24 bit LPCM audio or not?

[sebarious70]

24 bit sample for justdan96.wav.zip

Here's a short sample, the first 48 seconds or so, which should be enough. It wouldn't let me upload the wav, so I zipped it.