scipy.io : can't write wavfile

The write function in scipy.io.wavfile expects the input array to have the shape (num_samples, num_channels). I suspect your array has shape (num_channels, num_samples). Then write tries to put num_samples in a 16 bit field in a structure that gets written to the WAV file, but the value of num_samples is too big for a 16 bit value. (Note that if num_samples were small enough, you would not get an error, but the file would not have the correct format.)

A quick fix is to write the transpose of your array:

wavfile.write(outWaveFileName, 44100, stereoAudio.T)

For example, here is some code that demonstrates the error; x and y have shape (2, 40000):

In [12]: x = (2*np.random.rand(2, 40000) - 1).astype(np.float32)In [13]: y = (x*32767).astype('int16')In [14]: from scipy.io import wavfileIn [15]: wavfile.write('foo.wav', 44100, y)---------------------------------------------------------------------------error                                     Traceback (most recent call last)<ipython-input-15-36b8cd0e729c> in <module>()----> 1 wavfile.write('foo.wav', 44100, y)/Users/warren/anaconda/lib/python2.7/site-packages/scipy/io/wavfile.pyc in write(filename, rate, data)    351     352         fmt_chunk_data = struct.pack('<HHIIHH', format_tag, channels, fs,--> 353                                      bytes_per_second, block_align, bit_depth)    354         if not (dkind == 'i' or dkind == 'u'):    355             # add cbSize field for non-PCM fileserror: ushort format requires 0 <= number <= USHRT_MAX

Transpose the array so the input to wavfile.write has the expected shape:

In [16]: wavfile.write('foo.wav', 44100, y.T)

Read back the data to verify that it worked as expected:

In [22]: fs, z = wavfile.read('foo.wav')In [23]: np.allclose(z, y.T)Out[23]: True