Qt Android MediaPlayer for .mp3 files not working

MarcoDC

Hey there :D

I am almost done with porting my app from Qt5.15.17 QMake to Qt6.9.1 CMake :DDD
Last thing I noticed is that for some reason playing an .mp3 sound file does not work anymore :/

Previously there were no problems,
but after switching to the new version I receive output like

I/qt.multimedia.ffmpeg(30077): Using Qt multimedia with FFmpeg version 7.1.1 LGPL version 2.1 or later
...
W/AudioCapabilities(30077): Unsupported mime audio/ac4
W/AudioCapabilities(30077): Unsupported mime audio/x-ima
W/AudioCapabilities(30077): Unsupported mime audio/eac3-joc
W/AudioCapabilities(30077): Unsupported mime audio/evrc
W/AudioCapabilities(30077): Unsupported mime audio/mpeg-L1
W/AudioCapabilities(30077): Unsupported mime audio/mpeg-L2
W/AudioCapabilities(30077): Unsupported mime audio/qcelp
W/AudioCapabilities(30077): Unsupported mime audio/x-ms-wma
W/AudioCapabilities(30077): Unsupported mime audio/evrc
W/AudioCapabilities(30077): Unsupported mime audio/qcelp
W/VideoCapabilities(30077): Unrecognized profile 4 for video/hevc
W/VideoCapabilities(30077): Unsupported mime video/mp43
W/VideoCapabilities(30077): Unrecognized profile/level 1/32 for video/mp4v-es
W/VideoCapabilities(30077): Unrecognized profile/level 32768/2 for video/mp4v-es
W/VideoCapabilities(30077): Unrecognized profile/level 32768/64 for video/mp4v-es
W/VideoCapabilities(30077): Unsupported mime video/wvc1

on startup,
and when trying to play my set .mp3 file just:

W/ ( 8481): 273 - 2 2025-06-25 15:31:34.397 QAudioSink::start: QAudioFormat not supported by QAudioDevice >> :0 ()

Why is that? The Android device I am using is the same as before and this worked perfectly using Qt5.15.

I put some code in my main.cpp to print supported formats like

QAudioDevice device = QMediaDevices::defaultAudioOutput();
qDebug() << "Supported sample formats:";
for (auto fmt : device.supportedSampleFormats())
    qDebug() << "  " << fmt;

QAudioFormat format = device.preferredFormat();
qDebug() << "Sample rate:" << format.sampleRate();
qDebug() << "Channel count:" << format.channelCount();
qDebug() << "Sample format:" << format.sampleFormat();

and received this output:

D/default (30077): Supported sample formats:
D/default (30077): Int16
D/default (30077): Sample rate: 48000
D/default (30077): Channel count: 2
D/default (30077): Sample format: Int16

Because I did not find a real solution to this problem I just converted my .mp3 file to a .wav file which seems to work, but has an 10 times increased file size that also is reflected in the resulting apk/aab binary :/

Is anyone aware of a solution that allows me to continue playing .mp3 files on my Android device? This also works fine on iOS and macOS builds

MarcoDC

Ah I forgot, in my root project CMakeLists I just add Multimedia package to link against:

find_package(Qt6 REQUIRED COMPONENTS Quick Qml QuickControls2 ... Multimedia)
target_link_libraries(${PROJECT_NAME} PRIVATE
    Qt::Concurrent
    Qt::Qml
    Qt::Quick
    Qt::QuickControls2
    ...
    Qt::Multimedia
)

For iOS I needed to add

# Add FFMpeg lib for MediaPlayer support
qt_add_ios_ffmpeg_libraries(${PROJECT_NAME})

for audio to work at all, macOS does not need any additional stuff

So maybe there is some dependency for Android that I am just missing?

JoeCFD

both audio and video encoders/decoders have to be added in your android build.

MarcoDC

Hey @JoeCFD thanks for your answer :D

How/where to I do this?

JoeCFD

@MarcoDC If gstreamer(you may use FFmpeg) build for Android is downloaded, the libs and plugins are static and can not be linked for commercial use. What I did was to build all gstreamer stuff into a single dynamic lib. Very messy! But if your app is not commercial, you can simply link static ones to your app.