gst-launch 不会播放到 alsasink device=hw:2答案

【问题标题】：gst-launch won't play to alsasink device=hw:2gst-launch 不会播放到 alsasink device=hw:2
【发布时间】：2016-04-30 21:41:54
【问题描述】：

使用以下方法可以正常工作

gst-launch-0.10 filesrc location=temp.wav ! wavparse ! audioconvert ! alsasink device=hw:0

也一样

gst-launch-1.0 filesrc location=temp.wav ! wavparse ! audioconvert ! alsasink device=hw:0

当我使用 hw:2 时，如果播放器正在使用它，我会收到设备繁忙错误，否则会出现内部数据流错误。

如果我启用调试

GST_DEBUG=2

我得到以下信息

         alsa pcm_hw.c:1693:_snd_pcm_hw_open: alsalib error: Invalid value for card
basetransform gstbasetransform.c:1414:gst_base_transform_setcaps:<audioconvert0> transform could not transform audio/x-raw, format=(string)S16LE, layout=(string)interleaved, channels=(int)2, channel-mask=(bitmask)0x0000000000000003, rate=(int)44100 in anything we support
basetransform gstbasetransform.c:1414:gst_base_transform_setcaps:<audioconvert0> transform could not transform audio/x-raw, format=(string)S16LE, layout=(string)interleaved, channels=(int)2, channel-mask=(bitmask)0x0000000000000003, rate=(int)44100 in anything we support
basetransform gstbasetransform.c:1414:gst_base_transform_setcaps:<audioconvert0> transform could not transform audio/x-raw, format=(string)S16LE, layout=(string)interleaved, channels=(int)2, channel-mask=(bitmask)0x0000000000000003, rate=(int)44100 in anything we support
basetransform gstbasetransform.c:1414:gst_base_transform_setcaps:<audioconvert0> transform could not transform audio/x-raw, format=(string)S16LE, layout=(string)interleaved, channels=(int)2, channel-mask=(bitmask)0x0000000000000003, rate=(int)44100 in anything we support
     wavparse gstwavparse.c:2249:gst_wavparse_loop:<wavparse0> error: Internal data flow error.
     wavparse gstwavparse.c:2249:gst_wavparse_loop:<wavparse0> error: streaming task paused, reason not-negotiated (-4)
basetransform gstbasetransform.c:1414:gst_base_transform_setcaps:<audioconvert0> transform could not transform audio/x-raw, format=(string)S16LE, layout=(string)interleaved, channels=(int)2, channel-mask=(bitmask)0x0000000000000003, rate=(int)44100 in anything we support
ERROR: from element /GstPipeline:pipeline0/GstWavParse:wavparse0: Internal data flow error.

我确实从以下两个方面都听到了声音

gst123 -a alsa=hw:2 temp.wav
aplay -D hw:2 temp.wav

我是否遗漏了 gst-launch 的一些额外参数？

任何帮助将不胜感激！

【问题讨论】：

标签： audio gstreamer alsa gst-launch

【解决方案1】：

在写问题时，我找到了答案，但我想我会继续发布问题，以防其他人遇到同样的问题。确实缺少一个参数... audioresample。

gst-launch-1.0 filesrc location=temp.wav ! wavparse ! audioconvert ! audioresample ! alsasink device=hw:2

【讨论】：