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我试图从 rasberrypi 流式传输 rtmp，顺便说一下，omx 硬件编码器工作得非常好，所以我正在运行：

gst-launch-1.0 v4l2src ! «video/x-raw,width=640,height=480,framerate=30/1» !\
 omxh264enc target-bitrate=1000000 control-rate=variable !\
 video/x-h264,profile=high ! h264parse ! queue ! \
flvmux name=mux alsasrc device=plughw:1 ! audioresample ! \
audio/x-raw,rate=48000,channels=1 ! queue ! voaacenc bitrate=32000 ! queue ! mux. mux. !\
 rtmpsink location='rtmp://my_rtmp_for_ustream.tv_url'

并且有一个错误：

Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstAudioSrcClock
ERROR: from element /GstPipeline:pipeline0/GstAlsaSrc:alsasrc0: Internal data flow error.
Additional debug info:
gstbasesrc.c(2812): gst_base_src_loop (): /GstPipeline:pipeline0/GstAlsaSrc:alsasrc0:
streaming task paused, reason not-negotiated (-4)
Execution ended after 535913298 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
libv4l2: warning v4l2 mmap buffers still mapped on close()
Freeing pipeline ...

首先，我认为存在一些 alsa 问题等，但后来我尝试编写简单的 mpegts 并且它起作用了：

gst-launch-1.0 v4l2src ! «video/x-raw,width=640,height=480,framerate=30/1» ! \
omxh264enc target-bitrate=1000000 control-rate=variable !\
 video/x-h264,profile=high ! h264parse ! queue ! \
 mpegtsmux name=mux alsasrc device=plughw:1 ! audioresample !\
 audio/x-raw,rate=48000,channels=1 ! queue ! voaacenc bitrate=32000 ! \
queue ! mux. mux. ! filesink location=1.ts

但我不能只将“filesink location=1.ts”更改为 rtmpsink location='rtmp://my_rtmp_for_ustream.tv_url'，因为我会收到错误消息：

警告：错误的管道：无法将多路复用器链接到 rtmpsink0

那么，我该怎么做才能让它工作呢？谢谢。

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2 回答 2

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rtmpsink 需要“video/x-flv”格式的数据。您的第一个管道清楚地显示协商错误。您能否通过在命令行中添加 -v 来获取管道的上限协商转储。

于 2013-11-22T06:53:12.770 回答
0

真正的问题是 rtmpsync 需要原始 aac，所以我添加了 aacparse 并且它成功了，如下所示：

gst-launch-1.0 v4l2src ! \
   "video/x-raw, framerate=25/1, width=320, height=240" ! \
   omxh264enc target-bitrate=300000 control-rate=variable ! \
   h264parse ! queue ! flvmux name=muxer alsasrc device=hw:1 ! \
   audioresample ! "audio/x-raw,rate=48000" ! queue ! \
   voaacenc bitrate=32000 ! aacparse ! queue ! muxer. muxer. ! \
   rtmpsink location="$RTMP_URL"
于 2014-07-11T07:03:57.997 回答