Error connecting to audio devices (with MPV subprocess—in elevenlabs stream func)

Community Cloud
1

I’m using elevenlabs API to stream an audio response. It requires MPV (which I’ve put into packages.txt). Unfortunately, the mpv subprocess is unable to locate an audio device on Streamlit Cloud, evidenced by the stderr output:

ALSA lib confmisc.c:767:(parse_card) cannot find card '0'\nALSA lib conf.c:4745:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory\nALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings\nALSA lib conf.c:4745:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory\nALSA lib confmisc.c:1246:(snd_func_refer) error evaluating name\nALSA lib conf.c:4745:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory\nALSA lib conf.c:5233:(snd_config_expand) Evaluate error: No such file or directory\nALSA lib pcm.c:2660:(snd_pcm_open_noupdate) Unknown PCM default\nCannot connect to server socket err = No such file or directory\nCannot connect to server request channel\njack server is not running or cannot be started\nJackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock\nJackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock\nALSA lib confmisc.c:767:(parse_card) cannot find card '0'\nALSA lib conf.c:4745:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory\nALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings\nALSA lib conf.c:4745:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory\nALSA lib confmisc.c:1246:(snd_func_refer) error evaluating name\nALSA lib conf.c:4745:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory\nALSA lib conf.c:5233:(snd_config_expand) Evaluate error: No such file or directory\nALSA lib pcm.c:2660:(snd_pcm_open_noupdate) Unknown PCM default\nALSA lib pcm_hw.c:1829:(_snd_pcm_hw_open) Invalid value for card\ncouldn't open play stream: No such file or directory\n

Specifically, this issue occurs within the following function:

def stream(audio_stream: Iterator[bytes]) -> bytes:

    if not is_installed("mpv"):
        message = (
            "mpv not found, necessary to stream audio. "
            "On mac you can install it with 'brew install mpv'. "
            "On linux and windows you can install it from https://mpv.io/"
        )
        raise ValueError(message)

    mpv_command = ["mpv", "--no-cache", "--no-terminal", "--", "fd://0"]
    mpv_process = subprocess.Popen(
        mpv_command,
        stdin=subprocess.PIPE,
        stdout=subprocess.DEVNULL,
        stderr=subprocess.PIPE
    )

    audio = b""

    for chunk in audio_stream:
        if chunk is not None:
            mpv_process.stdin.write(chunk)  # ISSUE HERE
            mpv_process.stdin.flush()
            audio += chunk

    if mpv_process.stdin:
        mpv_process.stdin.close()
    mpv_process.wait()

    return audio

Any ideas on how to solve this?

There repository can be found here.

2

Hi @SuibhneOFoighil,

Thank you for sharing your question with the community!

Are you using a Windows or Mac machine?

For future reference, your post is missing a code snippet and a link to your app’s GitHub repo. Please check out our guidelines on how to post an effective question here and update your post to help the community answer your question.

3

Hey, thanks for replying. I’ve edited the post to provide more context.
I’m using a Mac!

4

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