Empty result file when removing silence

Hi,

I have tried to remove silence in the end of audio files. But the result is always an empty audio file.

Could someone please advise what I might be doing wrong? It works fine with PCM wav file but not A-Law.

See below for syntax and debug info.

Kind regards,

Fredrik

sox 1.wav 1_.wav silence 0 1 0.4 1%

sox formats: detected file format type `wav'

sox wav: WAV Chunk fmt

sox wav: WAV Chunk fact

sox wav: WAV Chunk data

sox wav: Reading Wave file: Microsoft A-law format, 1 channel, 8000 samp/sec

sox wav:         8000 byte/sec, 1 block align, 8 bits/samp, 27360 data bytes

sox wav:         27360 Samps/chans

Input File     : '1.wav'

Channels       : 1

Sample Rate    : 8000

Precision      : 13-bit

Duration       : 00:00:03.42 = 27360 samples ~ 256.5 CDDA sectors

Sample Encoding: 8-bit A-law

Endian Type    : little

Reverse Nibbles: no

Reverse Bits   : no

sox sox: Overwriting `1_.wav'

sox wav: Writing Wave file: Microsoft A-law format, 1 channel, 8000 samp/sec

sox wav:         8000 byte/sec, 1 block align, 8 bits/samp

Output File    : '1_.wav'

Channels       : 1

Sample Rate    : 8000

Precision      : 13-bit

Duration       : 00:00:03.42 = 27360 samples ~ 256.5 CDDA sectors

Sample Encoding: 8-bit A-law

Endian Type    : little

Reverse Nibbles: no

Reverse Bits   : no

Comment        : 'Processed by SoX'

sox sox: effects chain: input      8000Hz 1 channels 13 bits (multi)

sox sox: effects chain: silence    8000Hz 1 channels 13 bits (multi)

sox sox: effects chain: output     8000Hz 1 channels 13 bits (multi)

sox wav: Finished writing Wave file, 0 data bytes 0 samples

/Fredrik

Thanks for the advice.

It doesn’t matter if I reserve the audio file. The result is still an empty audio file.

And it is still working with a 16bit 8 kHz PCM wav file but not with 8bit 8 kHz A-Law wav file.

I could resample the a-law file to PCM, remove silence and then resample back to a-law but it doesn’t seem to be very efficient.

Any ideas for a better solution? Could this be a bug in Sox, that there is a problem with removing silence from a-law encoded audio files?

Regards,

Hi,

I have tried to remove silence in the end of audio files. But the result is always an empty audio file.

Could someone please advise what I might be doing wrong? It works fine with PCM wav file but not A-Law.

See below for syntax and debug info.

Kind regards,

Fredrik

sox 1.wav 1_.wav silence 0 1 0.4 1%

sox formats: detected file format type `wav'

sox wav: WAV Chunk fmt

sox wav: WAV Chunk fact

sox wav: WAV Chunk data

sox wav: Reading Wave file: Microsoft A-law format, 1 channel, 8000 samp/sec

sox wav:         8000 byte/sec, 1 block align, 8 bits/samp, 27360 data bytes

sox wav:         27360 Samps/chans

Input File     : '1.wav'

Channels       : 1

Sample Rate    : 8000

Precision      : 13-bit

Duration       : 00:00:03.42 = 27360 samples ~ 256.5 CDDA sectors

Sample Encoding: 8-bit A-law

Endian Type    : little

Reverse Nibbles: no

Reverse Bits   : no

sox sox: Overwriting `1_.wav'

sox wav: Writing Wave file: Microsoft A-law format, 1 channel, 8000 samp/sec

sox wav:         8000 byte/sec, 1 block align, 8 bits/samp

Output File    : '1_.wav'

Channels       : 1

Sample Rate    : 8000

Precision      : 13-bit

Duration       : 00:00:03.42 = 27360 samples ~ 256.5 CDDA sectors

Sample Encoding: 8-bit A-law

Endian Type    : little

Reverse Nibbles: no

Reverse Bits   : no

Comment        : 'Processed by SoX'

sox sox: effects chain: input      8000Hz 1 channels 13 bits (multi)

sox sox: effects chain: silence    8000Hz 1 channels 13 bits (multi)

sox sox: effects chain: output     8000Hz 1 channels 13 bits (multi)

sox wav: Finished writing Wave file, 0 data bytes 0 samples

/Fredrik