[Python] Why the number of samples given by `ffmpegio` differs using 2 methods?

I have an mp3 file at a sample rate value of 44100, let's name it a.mp3.

Using python library ffmpegio with the following code, i get a total amount of sample equal to 290704.

with ffmpegio.open(file, 'ra', blocksize = 16, sample_fmt = 'dbl') as file_opened:

for i, indata in enumerate(file_opened):

do some stuff
print((i + 1) * 16)


But,

ffmpegio.probe.audio_streams_basic('a.mp3')[0]['nb_samples']

gives me 292608

How the difference between 292608 and 290704 could be explained?

I search in ffmpegio documentation, but found nothing that trigered my attention:

https://python-ffmpegio.github.io/python-ffmpegio/

Thanks.

I tried to get more information about how the total number of samples was calculated in ffmpegio.probe.audio_streams_basic()

Also, the difference does not seem to increase with increasing the length of the mp3 file.

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