我希望有人可以帮助解决这个问题，过去2天一直在寻找解决方案。
简要描述问题：我正在尝试创建一个简单的qt5.7应用程序，它将流式传输m3u8（使用Qt Creator（社区）。但是当我尝试运行它时，我得到了一个
Warning: "No decoder available for type 'application/x-hls'."
Error: "Your GStreamer installation is missing a plug-in."
“gst-inspect | grep hls” 返回：typefindfunctions：application / x-hls：m3u8
此时我不知道哪个插件甚至可以错过，因为我已经通过完整的GStreamer插件列表并且一个接一个地放入。 至于我的搜索，有些人通过安装坏/丑的插件得到了解决方案。有人说QT5仍然使用gstreamer0.10，但新的linux版本使用1.0（此时丢失）。我试图设置一个标志来强制GST_VERSION = 1.0，不起作用，或者我做错了（我使用了qmake GST_VERSION = 1.0命令）。此外，我能够在vlc中播放视频。 我完全陷入困境，不知道该怎么做了。
应用代码：
import QtQuick 2.7
import QtQuick.Window 2.2
import QtMultimedia 5.7
Window {
visible: true
width: 640
height: 480
title: qsTr("Hello World")
Item {
width: 640
height: 480
MediaPlayer {
id: player
source: "http://playertest.longtailvideo.com/adaptive/wowzaid3/chunklist_w249832652.m3u8"
}
VideoOutput {
anchors.fill: parent
source: player
}
Component.onCompleted: {
player.play();
}
}
}
操作系统：
DISTRIB_ID=LinuxMint
DISTRIB_RELEASE=18
DISTRIB_CODENAME=sarah
DISTRIB_DESCRIPTION="Linux Mint 18 Sarah"
NAME="Linux Mint"
VERSION="18 (Sarah)"
ID=linuxmint
ID_LIKE=ubuntu
PRETTY_NAME="Linux Mint 18"
VERSION_ID="18"
HOME_URL="http://www.linuxmint.com/"
SUPPORT_URL="http://forums.linuxmint.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/linuxmint/"
UBUNTU_CODENAME=xenial
gstreamer插件列表：
ii gir1.2-gstreamer-0.10 0.10.36-1.5ubuntu1 amd64 Description: GObject introspection data for the GStreamer library
ii gir1.2-gstreamer-1.0 1.8.2-1~ubuntu1 amd64 GObject introspection data for the GStreamer library
ii gstreamer-qapt 3.0.2-0ubuntu1.1 amd64 GStreamer plugin to install codecs using QApt
ii gstreamer-tools 0.10.36-1.5ubuntu1 amd64 Tools for use with GStreamer
ii gstreamer0.10-alsa:amd64 0.10.36-2 amd64 GStreamer plugin for ALSA
ii gstreamer0.10-doc 0.10.36-1.5ubuntu1 all GStreamer core documentation and manuals
ii gstreamer0.10-ffmpeg:amd64 0.10.13-5ubuntu1~wily amd64 FFmpeg plugin for GStreamer
ii gstreamer0.10-ffmpeg-dbg:amd64 0.10.13-5ubuntu1~wily amd64 FFmpeg plugin for GStreamer (debug symbols)
ii gstreamer0.10-gconf:amd64 0.10.31-3+nmu4ubuntu2~gcc5.1 amd64 GStreamer plugin for getting the sink/source information from GConf
ii gstreamer0.10-gnomevfs:amd64 0.10.36-2 amd64 GStreamer plugin for GnomeVFS
ii gstreamer0.10-nice:amd64 0.1.13-0ubuntu2 amd64 ICE library (GStreamer 0.10 plugin)
ii gstreamer0.10-plugins-base:amd64 0.10.36-2 amd64 GStreamer plugins from the "base" set
ii gstreamer0.10-plugins-base:i386 0.10.36-2 i386 GStreamer plugins from the "base" set
ii gstreamer0.10-plugins-base-apps 0.10.36-2 amd64 GStreamer helper programs from the "base" set
ii gstreamer0.10-plugins-base-dbg:amd64 0.10.36-2 amd64 GStreamer plugins from the "base" set
ii gstreamer0.10-plugins-base-doc 0.10.36-2 all GStreamer documentation for plugins from the "base" set
ii gstreamer0.10-plugins-good:amd64 0.10.31-3+nmu4ubuntu2~gcc5.1 amd64 GStreamer plugins from the "good" set
ii gstreamer0.10-plugins-good:i386 0.10.31-3+nmu4ubuntu2~gcc5.1 i386 GStreamer plugins from the "good" set
ii gstreamer0.10-plugins-good-dbg:amd64 0.10.31-3+nmu4ubuntu2~gcc5.1 amd64 GStreamer plugins from the "good" set
ii gstreamer0.10-plugins-good-doc 0.10.31-3+nmu4ubuntu2~gcc5.1 all GStreamer documentation for plugins from the "good" set
ii gstreamer0.10-pulseaudio:amd64 0.10.31-3+nmu4ubuntu2~gcc5.1 amd64 GStreamer plugin for PulseAudio
ii gstreamer0.10-qapt 3.0.2-0ubuntu1.1 all transitional dummy package
ii gstreamer0.10-tools 0.10.36-1.5ubuntu1 amd64 Tools for use with GStreamer
ii gstreamer0.10-x:amd64 0.10.36-2 amd64 GStreamer plugins for X11 and Pango
ii gstreamer0.10-x:i386 0.10.36-2 i386 GStreamer plugins for X11 and Pango
ii gstreamer1.0-alsa:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer plugin for ALSA
ii gstreamer1.0-clutter 2.0.18-1 amd64 Clutter PLugin for GStreamer 1.0
ii gstreamer1.0-clutter-3.0 3.0.18-1 amd64 Clutter PLugin for GStreamer 1.0
ii gstreamer1.0-crystalhd 1:0.0~git20110715.fdd2f19-11build1 amd64 Crystal HD Video Decoder (GStreamer plugin)
ii gstreamer1.0-doc 1.8.2-1~ubuntu1 all GStreamer core documentation and manuals
ii gstreamer1.0-dvswitch 0.1.1-1 amd64 GStreamer plugin source from DVswitch
ii gstreamer1.0-espeak 0.4.0-1 amd64 GStreamer plugin for eSpeak speech synthesis
ii gstreamer1.0-fluendo-mp3:amd64 0.10.32.debian-1 amd64 Fluendo mp3 decoder GStreamer 1.0 plugin
ii gstreamer1.0-hybris:i386 1.8.2-1ubuntu0.1 i386 GStreamer plugins from hybris
ii gstreamer1.0-libav:amd64 1.8.2-1~ubuntu1 amd64 libav plugin for GStreamer
ii gstreamer1.0-libav-dbg:amd64 1.8.2-1~ubuntu1 amd64 libav plugin for GStreamer (debug symbols)
ii gstreamer1.0-nice:amd64 0.1.13-0ubuntu2 amd64 ICE library (GStreamer plugin)
ii gstreamer1.0-packagekit 0.8.17-4ubuntu6~gcc5.4ubuntu1.1 amd64 GStreamer plugin to install codecs using PackageKit
ii gstreamer1.0-plugins-bad:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer plugins from the "bad" set
ii gstreamer1.0-plugins-bad-dbg:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer plugins from the "bad" set (debug symbols)
ii gstreamer1.0-plugins-bad-doc 1.8.2-1ubuntu0.1 all GStreamer documentation for plugins from the "bad" set
ii gstreamer1.0-plugins-bad-faad:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer faad plugin from the "bad" set
ii gstreamer1.0-plugins-bad-videoparsers:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer videoparsers plugin from the "bad" set
ii gstreamer1.0-plugins-base:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer plugins from the "base" set
ii gstreamer1.0-plugins-base-apps 1.8.2-1ubuntu0.1 amd64 GStreamer helper programs from the "base" set
ii gstreamer1.0-plugins-base-dbg:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer plugins from the "base" set
ii gstreamer1.0-plugins-base-doc 1.8.2-1ubuntu0.1 all GStreamer documentation for plugins from the "base" set
ii gstreamer1.0-plugins-good:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer plugins from the "good" set
ii gstreamer1.0-plugins-good-dbg:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer plugins from the "good" set
ii gstreamer1.0-plugins-good-doc 1.8.2-1ubuntu0.1 all GStreamer documentation for plugins from the "good" set
ii gstreamer1.0-plugins-ugly:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer plugins from the "ugly" set
ii gstreamer1.0-plugins-ugly-amr:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer plugins from the "ugly" set
ii gstreamer1.0-plugins-ugly-dbg:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer plugins from the "ugly" set (debug symbols)
ii gstreamer1.0-plugins-ugly-doc 1.8.2-1ubuntu0.1 all GStreamer documentation for plugins from the "ugly" set
ii gstreamer1.0-pocketsphinx:amd64 0.8.0+real5prealpha-1ubuntu2 amd64 Speech recognition tool - gstreamer plugin
ii gstreamer1.0-pulseaudio:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer plugin for PulseAudio
ii gstreamer1.0-tools 1.8.2-1~ubuntu1 amd64 Tools for use with GStreamer
ii gstreamer1.0-vaapi:amd64 1.8.2-1~ubuntu2 amd64 VA-API plugins for GStreamer
ii gstreamer1.0-vaapi-doc 1.8.2-1~ubuntu2 all GStreamer VA-API documentation and manuals
ii gstreamer1.0-x:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer plugins for X11 and Pango
ii libcanberra-gstreamer:amd64 0.30-2.1ubuntu1 amd64 GStreamer backend for libcanberra
ii libgstreamer-ocaml 0.2.0-2build2 amd64 OCaml interface to the gstreamer library -- runtime files
ii libgstreamer-ocaml-dev 0.2.0-2build2 amd64 OCaml interface to the gstreamer library -- development files
ii libgstreamer-plugins-bad1.0-0:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer development files for libraries from the "bad" set
ii libgstreamer-plugins-bad1.0-0:i386 1.8.2-1ubuntu0.1 i386 GStreamer development files for libraries from the "bad" set
ii libgstreamer-plugins-bad1.0-dev 1.8.2-1ubuntu0.1 amd64 GStreamer development files for libraries from the "bad" set
ii libgstreamer-plugins-base0.10-0:amd64 0.10.36-2 amd64 GStreamer libraries from the "base" set
ii libgstreamer-plugins-base0.10-0:i386 0.10.36-2 i386 GStreamer libraries from the "base" set
ii libgstreamer-plugins-base0.10-dev 0.10.36-2 amd64 GStreamer development files for libraries from the "base" set
ii libgstreamer-plugins-base1.0-0:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer libraries from the "base" set
ii libgstreamer-plugins-base1.0-0:i386 1.8.2-1ubuntu0.1 i386 GStreamer libraries from the "base" set
ii libgstreamer-plugins-base1.0-dev 1.8.2-1ubuntu0.1 amd64 GStreamer development files for libraries from the "base" set
ii libgstreamer-plugins-good1.0-0:amd64 1.8.2-1ubuntu0.1 amd64 GStreamer development files for libraries from the "good" set
ii libgstreamer-plugins-good1.0-dev 1.8.2-1ubuntu0.1 amd64 GStreamer development files for libraries from the "good" set
ii libgstreamer0.10-0:amd64 0.10.36-1.5ubuntu1 amd64 Core GStreamer libraries and elements
ii libgstreamer0.10-0:i386 0.10.36-1.5ubuntu1 i386 Core GStreamer libraries and elements
ii libgstreamer0.10-0-dbg:amd64 0.10.36-1.5ubuntu1 amd64 Core GStreamer libraries and elements
ii libgstreamer0.10-dev 0.10.36-1.5ubuntu1 amd64 GStreamer core development files
ii libgstreamer1.0-0:amd64 1.8.2-1~ubuntu1 amd64 Core GStreamer libraries and elements
ii libgstreamer1.0-0:i386 1.8.2-1~ubuntu1 i386 Core GStreamer libraries and elements
ii libgstreamer1.0-0-dbg:amd64 1.8.2-1~ubuntu1 amd64 Core GStreamer libraries and elements
ii libgstreamer1.0-dev 1.8.2-1~ubuntu1 amd64 GStreamer core development files
ii libgstreamermm-1.0-0v5:amd64 1.4.3+dfsg-5 amd64 C++ wrapper library for GStreamer (shared libraries)
ii libgstreamermm-1.0-dev:amd64 1.4.3+dfsg-5 amd64 C++ wrapper library for GStreamer (development files)
ii libqt5gstreamer-1.0-0:amd64 1.2.0-3 amd64 C++ bindings library for GStreamer with a Qt-style API - Qt 5 build
ii libqt5gstreamer-dev 1.2.0-3 amd64 Development headers for QtGStreamer - Qt 5 build
ii libqt5gstreamerquick-1.0-0:amd64 1.2.0-3 amd64 QtGStreamerQuick library - Qt 5 build
ii libqt5gstreamerui-1.0-0:amd64 1.2.0-3 amd64 QtGStreamerUi library - Qt 5 build
ii libqt5gstreamerutils-1.0-0:amd64 1.2.0-3 amd64 QtGStreamerUtils library - Qt 5 build
ii libqtgstreamer-1.0-0:amd64 1.2.0-3 amd64 C++ bindings library for GStreamer with a Qt-style API
ii libqtgstreamer-dev 1.2.0-3 amd64 Development headers for QtGStreamer
ii libqtgstreamerui-1.0-0:amd64 1.2.0-3 amd64 QtGStreamerUi library
ii libqtgstreamerutils-1.0-0:amd64 1.2.0-3 amd64 QtGStreamerUtils library
ii libreoffice-avmedia-backend-gstreamer 1:5.1.4-0ubuntu1 amd64 GStreamer backend for LibreOffice
ii liquidsoap-plugin-gstreamer 1.1.1-7.1 amd64 audio streaming language -- GStreamer plugin
ii phonon-backend-gstreamer:amd64 4:4.8.2-0ubuntu2 amd64 Phonon GStreamer 1.0 backend
ii phonon-backend-gstreamer-common:amd64 4:4.8.2-0ubuntu2 amd64 Phonon GStreamer 1.0.x backend icons
ii phonon4qt5-backend-gstreamer:amd64 4:4.8.2-0ubuntu2 amd64 Phonon Qt5 GStreamer 1.0 backend
ii qml-module-qtgstreamer:amd64 1.2.0-3 amd64 QML plugins from QtGStreamer - Qt 5 build
ii qt5gstreamer-dbg:amd64 1.2.0-3 amd64 Debug symbols for QtGStreamer - Qt 5 build
ii qtgstreamer-dbg:amd64 1.2.0-3 amd64 Debug symbols for QtGStreamer
ii qtgstreamer-declarative:amd64 1.2.0-3 amd64 QML plugins from QtGStreamer
ii qtgstreamer-plugins:amd64 1.2.0-3 amd64 GStreamer plugins from QtGStreamer
ii qtgstreamer-plugins-qt5:amd64 1.2.0-3 amd64 GStreamer plugins from QtGStreamer - Qt 5 build
答案 0 :(得分：2)
hls插件在gst-plugins-bad中。确定请检查 ＆＃34; gst-inspect-1.0 | grep hls＆＃34; - 关于你发行版gst-inspect可能是gst-inspect-0.10的符号链接。
答案 1 :(得分：1)
缺少的元素名为hlsdemux，位于gst-plugins-bad。您可以使用gst-inspect-0.10或gst-inspect-1.0查看已安装的插件列表。使用grep将允许您快速查明是否安装了它。
gst-inspect-1.0 | grep hlsdemux（或0.10，具体取决于您要使用的版本）
如果QtMultimedia确实使用0.10，那么你应该缺少gstreamer0.10-plugins-bad。请注意，0.10已过时且未使用多年。 1.0正在积极开发中。您应该检查更新版本的QtMultimedia是否已升级到1.0版本并尝试使用它。
答案 2 :(得分：1)
我知道我回答“有点晚”，但迟到总比不到好
这里发生的情况是您的操作系统上缺少某些编解码器，因此我们需要安装它们才能播放视频/音频。
请注意，这仅适用于 Ubuntu 或基于 Ubuntu 的发行版，例如 Linux Mint 等。
要安装缺少的编解码器，您应该在终端上运行以下命令（或添加 ubuntu-restricted-extras 作为对 .deb 文件的依赖项）：
sudo apt install ubuntu-restricted-extras