如何修复`WARNING:error pipeline:no element“mad”`

Question

我正在运行gstreamer命令，用以下命令从终端播放mp3：

gst-launch-1.0-v filesrc location=/home/user/songs/歌曲.mp3! 疯了！音频转换！音频重采样！自动音频接收器

我收到下面的错误，mp3没有播放

警告：错误的管道：没有元素“mad”

我已经用下面的命令安装了gstreamer插件：

sudo apt get install gstreamer1.0-plugins-good-gstreamer1.0-plugins-bad gstreamer1.0-plugins-ducky gstreamer1.0-libav

它们已成功安装，但错误仍然存在。在

我还检查了mad插件是否已经被黑名单使用 gst-inspect-1.0及其未列入黑名单。在

我已清除~/.cache/gstreamer-1.0/registry.*.bin.

下面的命令在ubuntu18.04中失败

gst-launch-1.0-v filesrc location=/home/user/songs/歌曲.mp3! 疯了！音频转换！音频重采样！自动音频接收器

下面的命令有效，但我想使用“mad:而不是”decodebin“：

gst-launch-1.0-v filesrc location=/home/user/songs/歌曲.mp3! 解码箱！音频转换！音频重采样！自动音频接收器

Answer 1

从GStreamer的1.12 Changelog中删除插件：

The mad mp1/mp2/mp3 decoder plugin was removed from gst-plugins-ugly, as libmad is GPL licensed, has been unmaintained for a very long time, and there are better alternatives available. Use the mpg123audiodec element from the mpg123 plugin in gst-plugins-ugly instead, or avdec_mp3 from the gst-libav module which wraps the ffmpeg library. We expect that we will be able to move mp3 decoding to gst-plugins-good in the next cycle seeing that most patents around mp3 have expired recently or are about to expire.