Decoder gives "Duration invalid" error

[gregburman-sony]

Hi, I'm playing around with the executables as described in usage.md, to see how the pipeline works. I generated a dummy wav file which is just a sine wave with a frequency of 85 Hz over a duration of 1 second, sampled at 44100 Hz.

I ran Encoder.exe to generate an hmpg file as follows:

.\Encoder.exe -f .\sine_wave_85Hz.wav -o sine_wave_85Hz.hmpg --binary

I then tried running Decoder.exe as follows:

.\Decoder.exe -f sine_wave_85Hz.hmpg -o sine_wave_85Hz.hjif 

I then get the following output:

> .\Decoder.exe -f .\sine_wave_85Hz.hmpg -o .\sine_wave_85Hz.hjif
The file to process is : .\sine_wave_85Hz.hmpg
.\sine_wave_85Hz.hmpg: File does not comply with standard ISO/IEC 23090-31.
More information are provided in file: .\sine_wave_85Hz.log

.\sine_wave_85Hz.log has the following contents:

MIHSUnit_Silent error: Duration invalid. Error code: 72

Am I possibly using the executables incorrectly, e.g. by using an incorrectly generated wav file?

I'm running this on Windows 11 Enterprise, version 23H2. I compiled and built the code with Visual Studio 2022.

[QuentinGalvane]

Hello Greg,

Could you maybe share the wav file you generated so that I can test it on my side. Since you are using the default encoder arguments, it should be using the band decomposition with a curve band for the low frequency band and the Wavelet encoder for the high frequency band. I will check, but I believe the frequency split is set at around 75Hz so you might be left with not a lot of data on the high frequency part which might explain the silent Unit (I am not sure about the issue on the duration of the silent unit though).
In the meantime, you could also try to bypass the binary encoding just to check the output by encoding directly into HJIF:
.\Encoder.exe -f .\sine_wave_85Hz.wav -o sine_wave_85Hz.hjif
Then you can synthetize this file to see the output.
You could also try to use only the Wavelet decoder:
.\Encoder.exe -f .\sine_wave_85Hz.wav -o sine_wave_85Hz.hmpg --binary --disable-vectorial
Or only the Vectorial encoding:
.\Encoder.exe -f .\sine_wave_85Hz.wav -o sine_wave_85Hz.hmpg --binary --disable-wavelet

If you send me the wave file, I'll investigate the issue on my side.
Best

[gregburman-sony]

Hi Quentin

I actually figured it out - looks like the sample rate needs to be 8 Khz, while I was generating my wav files with 44.1 Khz.

Indeed I am seeing a curve band for 0-72 Hz and wavelet for 72-8000 Hz in the output hjif file. Can you say why 8 kHz is required for the sampling rate? I just found this line indicating so, but not much else on this.

For reference, here is the wav file generated at 44.1 kHz: sine_wave_85Hz.wav, in case you want to reproduce the error output.

Thanks for the quick reply!