Question

我正在尝试使用iLBC编解码器构建一个gstreamer管道来创建RTP音频流。 Gstreamer（从版本0.10开始）有一个名为rtpilbcpay的RTP payloader管道元素。不幸的是，只实现了RTP打包，编解码器本身不包含在gstreamer中。使用RFC 3951中的参考代码，我为样本音频创建了iLBC编码文件，我希望能够与gstreamer一起使用。但是，当我将这些文件传输到rtpilbcpay时，我最终会出错。我使用fakesink将管道“愚蠢”降到最低，错误仍然相同：

~/tmp% gst-launch-0.10 filesrc location=sample.ilbc ! rtpilbcpay ! fakesink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstRTPILBCPay:rtpilbcpay0: Element doesn't implement handling of this stream. Please file a bug.
Additional debug info:
gstbasertpaudiopayload.c(909): gst_base_rtp_audio_payload_handle_buffer (): /GstPipeline:pipeline0/GstRTPILBCPay:rtpilbcpay0:
subclass did not configure us properly
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...

我可能在管道中缺少一个关键部分（文件格式声明？），因为我同样无法播放PCMU编码文件（queue缓冲区也没有帮助）：

~/tmp% gst-launch-0.10 filesrc location=sample.pcmu ! mulawdec ! fakesink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstFileSrc:filesrc0: Internal data flow error.
Additional debug info:
gstbasesrc.c(2550): gst_base_src_loop (): /GstPipeline:pipeline0/GstFileSrc:filesrc0:
streaming task paused, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...

这只是一个错误还是管道设置错误（我希望它是后者）？我需要在管道中进一步“粘合”哪些元素？

Answer 1

确实我错过了一些东西。一旦我添加了正确的MIME类型和其他一些属性，我就可以成功地将文件传输到RTP payloader中：

~/tmp% gst-launch-0.10 filesrc location=sample.ilbc \
  ! 'audio/x-iLBC,rate=8000,channels=1,mode=20' \
  ! rtpilbcpay ! udpsink host=192.168.10.23 port=5555

使用gstreamer通过RTP流式传输iLBC编码文件

1 个答案: