Segmentation fault transcoding mp3 to wav using pysox

[PETER BLEACKLEY <pete.bleackley@xxxxxxxxxxxxxx>]

I'm trying to transcribe a podcast. To do this, I'm streaming mp3 from the web, and transcoding it to wav with pysox before piping the transcoded audio to the speech recognition component. My sox installation is the latest version, built from source on AWS, and with the LAME and Wavpack libraries included (also built from source).

The relevant code is

            (to_adapter,from_sox)=multiprocessing.Pipe()

            sox_output=pysox.SocketOutput('output',[from_sox])

            mp3=mp3Downloader(audio_url)

            sox=pysox.CEffectsChain(istream=mp3.stream)

            sox.add_effect(pysox.CEffect('channels',['1']))

            sox.add_effect(pysox.CEffect('rate',['16k']))

            sox.add_effect(pysox.CEffect('bits',['16']))

            sox.add_effect(pysox.CEffect('type',['wav']))

            sox.add_effect(sox_output)

class mp3Downloader(multiprocessing.Process,object):

    """Downloads an mp3 file and sends it through a pipe"""

    def __init__(self,audio_url):

        """Sets up the pipe"""

        super(mp3Downloader,self).__init__()

        self.from_web,to_stream=multiprocessing.Pipe()

        self.stream=pysox.CPysoxPipeStream(path=to_stream)

        self.audio_url=audio_url

    def run(self):

        """Downloads the audio and feeds it to the pipe"""

        audio=requests.get(self.audio_url,stream=True)

        for block in audio.iter_content(1024):

            self.from_web.send(block)

This produces a segmentation fault. What can I do to remedy this?

Pete Bleackley

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