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conda-forge / qt-feedstock

A conda-smithy repository for qt.
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QMediaPlayer not working #226

Open kuepe-sl opened 2 years ago

kuepe-sl commented 2 years ago

Solution to issue cannot be found in the documentation.

Issue

When trying to instantiate a QMediaPlayer object, I get the following error message:

defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"

Trying to play back a WAV or MP3 file results in silence.

Here is an example program that shows the error:

#!/usr/bin/env python3
import sys
import time
from PyQt5.QtCore import QUrl
from PyQt5.QtMultimedia import QMediaPlayer
from PyQt5.QtMultimedia import QMediaContent

file = QUrl.fromLocalFile(sys.argv[1])
media = QMediaContent(file)
player = QMediaPlayer()
player.setMedia(media)
player.setVolume(100)
player.play()

while player.state() != QMediaPlayer.StoppedState:
    time.sleep(1.0)

The program needs the packages: pyqt gst-plugins-good and can be run like this

python qtmedia-test.py file.wav

The same error and behaviour occours after compiling the official Qt Media Player Example using the Conda Qt toolchain and qmake.

EDIT: I just tried the script under Windows and I get the same issue there.

Installed packages

# Name                    Version                   Build  Channel
_libgcc_mutex             0.1                 conda_forge    conda-forge
_openmp_mutex             4.5                       1_gnu    conda-forge
alsa-lib                  1.2.3                h516909a_0    conda-forge
brotli                    1.0.9                h166bdaf_7    conda-forge
brotli-bin                1.0.9                h166bdaf_7    conda-forge
bzip2                     1.0.8                h7f98852_4    conda-forge
c-ares                    1.18.1               h7f98852_0    conda-forge
ca-certificates           2021.10.8            ha878542_0    conda-forge
cmake                     3.23.0               h5432695_1    conda-forge
dbus                      1.13.6               h5008d03_3    conda-forge
expat                     2.4.8                h27087fc_0    conda-forge
fmt                       8.1.1                h4bd325d_0    conda-forge
font-ttf-dejavu-sans-mono 2.37                 hab24e00_0    conda-forge
font-ttf-inconsolata      3.000                h77eed37_0    conda-forge
font-ttf-source-code-pro  2.038                h77eed37_0    conda-forge
font-ttf-ubuntu           0.83                 hab24e00_0    conda-forge
fontconfig                2.14.0               h8e229c2_0    conda-forge
fonts-conda-ecosystem     1                             0    conda-forge
fonts-conda-forge         1                             0    conda-forge
freetype                  2.10.4               h0708190_1    conda-forge
gettext                   0.19.8.1          h73d1719_1008    conda-forge
glib                      2.70.2               h780b84a_4    conda-forge
glib-networking           2.70.1               h3cf747a_0    conda-forge
glib-tools                2.70.2               h780b84a_4    conda-forge
gst-plugins-base          1.20.1               hcf0ee16_1    conda-forge
gst-plugins-good          1.20.1               h20dca43_1    conda-forge
gstreamer                 1.20.1               hd4edc92_1    conda-forge
icu                       69.1                 h9c3ff4c_0    conda-forge
jack                      1.9.18            hfd4fe87_1001    conda-forge
jpeg                      9e                   h7f98852_0    conda-forge
keyutils                  1.6.1                h166bdaf_0    conda-forge
krb5                      1.19.3               h3790be6_0    conda-forge
lame                      3.100             h7f98852_1001    conda-forge
ld_impl_linux-64          2.36.1               hea4e1c9_2    conda-forge
libbrotlicommon           1.0.9                h166bdaf_7    conda-forge
libbrotlidec              1.0.9                h166bdaf_7    conda-forge
libbrotlienc              1.0.9                h166bdaf_7    conda-forge
libclang                  13.0.1          default_hc23dcda_0    conda-forge
libcurl                   7.82.0               h7bff187_0    conda-forge
libdb                     6.2.32               h9c3ff4c_0    conda-forge
libedit                   3.1.20191231         he28a2e2_2    conda-forge
libev                     4.33                 h516909a_1    conda-forge
libevent                  2.1.10               h9b69904_4    conda-forge
libffi                    3.4.2                h7f98852_5    conda-forge
libflac                   1.3.4                h27087fc_0    conda-forge
libgcc-ng                 11.2.0              h1d223b6_15    conda-forge
libglib                   2.70.2               h174f98d_4    conda-forge
libgomp                   11.2.0              h1d223b6_15    conda-forge
libiconv                  1.16                 h516909a_0    conda-forge
libllvm13                 13.0.1               hf817b99_2    conda-forge
libnghttp2                1.47.0               h727a467_0    conda-forge
libnsl                    2.0.0                h7f98852_0    conda-forge
libogg                    1.3.4                h7f98852_1    conda-forge
libopus                   1.3.1                h7f98852_1    conda-forge
libpng                    1.6.37               h21135ba_2    conda-forge
libpq                     14.2                 hd57d9b9_0    conda-forge
libpsl                    0.21.1               he07bd03_4    conda-forge
libsndfile                1.0.31               h9c3ff4c_1    conda-forge
libsodium                 1.0.18               h36c2ea0_1    conda-forge
libsoup                   2.74.1               hdd0e21f_0    conda-forge
libssh2                   1.10.0               ha56f1ee_2    conda-forge
libstdcxx-ng              11.2.0              he4da1e4_15    conda-forge
libuuid                   2.32.1            h7f98852_1000    conda-forge
libuv                     1.43.0               h7f98852_0    conda-forge
libvorbis                 1.3.7                h9c3ff4c_0    conda-forge
libxcb                    1.13              h7f98852_1004    conda-forge
libxkbcommon              1.0.3                he3ba5ed_0    conda-forge
libxml2                   2.9.12               h885dcf4_1    conda-forge
libzlib                   1.2.11            h166bdaf_1014    conda-forge
lz4-c                     1.9.3                h9c3ff4c_1    conda-forge
mysql-common              8.0.28               haf5c9bc_3    conda-forge
mysql-libs                8.0.28               h28c427c_3    conda-forge
ncurses                   6.3                  h27087fc_1    conda-forge
nspr                      4.32                 h9c3ff4c_1    conda-forge
nss                       3.77                 h2350873_0    conda-forge
openssl                   1.1.1n               h166bdaf_0    conda-forge
pcre                      8.45                 h9c3ff4c_0    conda-forge
pip                       22.0.4             pyhd8ed1ab_0    conda-forge
pthread-stubs             0.4               h36c2ea0_1001    conda-forge
pyqt                      5.12.3           py39hf3d152e_8    conda-forge
pyqt-impl                 5.12.3           py39hde8b62d_8    conda-forge
pyqt5-sip                 4.19.18          py39he80948d_8    conda-forge
pyqtchart                 5.12             py39h0fcd23e_8    conda-forge
pyqtwebengine             5.12.1           py39h0fcd23e_8    conda-forge
python                    3.9.12          h9a8a25e_1_cpython    conda-forge
python_abi                3.9                      2_cp39    conda-forge
qt                        5.12.9               h1304e3e_6    conda-forge
readline                  8.1                  h46c0cb4_0    conda-forge
rhash                     1.4.1                h7f98852_0    conda-forge
setuptools                62.1.0           py39hf3d152e_0    conda-forge
sqlite                    3.38.2               h4ff8645_0    conda-forge
tk                        8.6.12               h27826a3_0    conda-forge
tzdata                    2022a                h191b570_0    conda-forge
wheel                     0.37.1             pyhd8ed1ab_0    conda-forge
xorg-libxau               1.0.9                h7f98852_0    conda-forge
xorg-libxdmcp             1.1.3                h7f98852_0    conda-forge
xz                        5.2.5                h516909a_1    conda-forge
zlib                      1.2.11            h166bdaf_1014    conda-forge
zstd                      1.5.2                ha95c52a_0    conda-forge

Environment info

active environment : qt-media
    active env location : /home/user/miniconda3/envs/qt-media
            shell level : 2
       user config file : /home/user/.condarc
 populated config files : /home/user/.condarc
          conda version : 4.12.0
    conda-build version : 3.21.8
         python version : 3.8.13.final.0
       virtual packages : __linux=5.13.0=0
                          __glibc=2.31=0
                          __unix=0=0
                          __archspec=1=x86_64
       base environment : /home/user/miniconda3  (writable)
      conda av data dir : /home/user/miniconda3/etc/conda
  conda av metadata url : None
           channel URLs : https://conda.anaconda.org/conda-forge/linux-64
                          https://conda.anaconda.org/conda-forge/noarch
                          https://repo.anaconda.com/pkgs/main/linux-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/linux-64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /home/user/miniconda3/pkgs
                          /home/user/.conda/pkgs
       envs directories : /home/user/miniconda3/envs
                          /home/user/.conda/envs
               platform : linux-64
             user-agent : conda/4.12.0 requests/2.27.1 CPython/3.8.13 Linux/5.13.0-30-generic ubuntu/20.04.4 glibc/2.31
                UID:GID : 1000:1000
             netrc file : /home/user/.netrc
           offline mode : False
kuepe-sl commented 2 years ago

I just noticed that the file <ROOT>/plugins/mediaservice/libgstmediaplayer.so is missing in the package.
The file was present in qt 5.12.9, build 4 (linux64), but it went missing in build 5. (MR #214)

By installing qt=5.12.9=hda022c4_4, the error message vanishes unter Linux. It appears to play the file back (player.state() returns 1), but without audio. mamba install -c dtk-forge gst-plugins-good-pulseaudio eventually gives me audio.

The error ("no service found") persists under Windows even with build 4.

andfoy commented 2 years ago

Did you compile PyQt using the qt-main package? There are no PyQt packages available: https://github.com/conda-forge/pyqt-feedstock/pull/107

kuepe-sl commented 2 years ago

I used the existing pyqt package. However the pyqt package doesn't seem to be version-pinned, so it ends up installing v5.12.3:

pyqt                      5.12.3           py39hf3d152e_8    conda-forge

This version of pyqt worked fine enough for testing. I assumed a small Python script would be easier to test than a full C++ project.