Audio 如何使用gst启动播放原始音频文件？

我用的是gst-launch-0.10

我使用以下命令从mp3文件创建了一个pcm文件（至少，我想我已经创建了）：

gst-launch-0.10 filesrc location=my-sound.mp3 ! mad ! audioresample ! audioconvert ! 'audio/x-raw-int, rate=8000, channels=1, endianness=4321, width=16, depth=16, signed=true' ! filesink location=out.raw

我现在有一个out.raw文件

为了测试是否一切正常，我想重放一遍。 我试过（除其他外）：

但我每次都会犯这样的错误：

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstCapsFilter:capsfilter0: Filter caps do not completely specify the output format
Additional debug info:
gstcapsfilter.c(393): gst_capsfilter_prepare_buf (): /GstPipeline:pipeline0/GstCapsFilter:capsfilter0:
Output caps are unfixed: EMPTY
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...

---

“筛选器上限未完全指定输出格式”？这里缺少什么？

好吧，在

alsasink

之前添加

audioconvert

过滤器使它工作起来。根据gst inspect，指定的音频格式与alsa兼容。所以我想这是声卡的问题，

audioconvert

以某种方式将数据转换成我的声卡可以处理的东西。只是猜测而已

我还删除了

可以激活pull=true

选项。此选项激活时的音质非常差。我想知道为什么

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstCapsFilter:capsfilter0: Filter caps do not completely specify the output format
Additional debug info:
gstcapsfilter.c(393): gst_capsfilter_prepare_buf (): /GstPipeline:pipeline0/GstCapsFilter:capsfilter0:
Output caps are unfixed: EMPTY
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...