Jack-Server läuft nicht oder kann nicht gestartet werden

Question

Ich bekomme den folgenden Fehler beim Versuch, pyaudio in Python zu verwenden.

Python 2.7.10 (default, Oct 14 2015, 16:09:02) 
[GCC 5.2.1 20151010] on linux2 
Type "help", "copyright", "credits" or "license" for more information. 
>>> import pyaudio 
>>> p = pyaudio.PyAudio() 
ALSA lib pcm.c:2267:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear 
ALSA lib pcm.c:2267:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe 
ALSA lib pcm.c:2267:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side 
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map 
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map 
Cannot connect to server socket err = No such file or directory 
Cannot connect to server request channel 
jack server is not running or cannot be started 

Es scheint wie das Problem ist spezifisch für eine Version von Pyaudio, so versucht zu aktualisieren. Wenn ich versuche, pyaudio zu aktualisieren:

abhishek@vaio:/etc/apt/sources.list.d$ sudo pip install pyaudio --upgrade 
The directory '/home/abhishek/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.        
The directory '/home/abhishek/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.          
Collecting pyaudio 
    Downloading PyAudio-0.2.9.tar.gz (289kB) 
    100% |████████████████████████████████| 296kB 539kB/s 
Installing collected packages: pyaudio 
    Found existing installation: PyAudio 0.2.8 
    DEPRECATION: Uninstalling a distutils installed project (pyaudio) has been deprecated and will be removed in a future version. This is due to the fact that uninstalling a distutils project will only partially uninstall the project.            
    Uninstalling PyAudio-0.2.8: 
     Successfully uninstalled PyAudio-0.2.8 
    Running setup.py install for pyaudio ... error 
    Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-15VuRi/pyaudio/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-QGLaRp-record/install-record.txt --single-version-externally-managed --compile: 
    running install 
    running build 
    running build_py 
    creating build 
    creating build/lib.linux-x86_64-2.7 
    copying src/pyaudio.py -> build/lib.linux-x86_64-2.7 
    running build_ext 
    building '_portaudio' extension 
    creating build/temp.linux-x86_64-2.7 
    creating build/temp.linux-x86_64-2.7/src 
    x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c src/_portaudiomodule.c -o build/temp.linux-x86_64-2.7/src/_portaudiomodule.o 
    src/_portaudiomodule.c:28:20: fatal error: Python.h: No such file or directory 
    compilation terminated. 
    error: command 'x86_64-linux-gnu-gcc' failed with exit status 1 

    ---------------------------------------- 
    Rolling back uninstall of PyAudio 
Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-15VuRi/pyaudio/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-QGLaRp-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-15VuRi/pyaudio/                      

Answer 1

Keine dieser Meldungen sind tatsächliche Fehler. PortAudio "pingt" nur alle möglichen Host-APIs und Geräte und schaut, ob sie verfügbar sind oder nicht. Dies führt typischerweise zu einigen Nachrichten auf dem Endgerät, die in den meisten Fällen ignoriert werden können.

Wenn Sie einen Python PortAudio-Wrapper möchten, der diese Nachrichten nicht druckt (weil er sie für Sie unterdrückt), sehen Sie sich das Modul sounddevice an.