我有一个问题是试图从带有声音的logitech c210网络摄像头中流式传输rtmp。
我已经安装了gstreamer1.0-omx和其他需要的stuf，但是当我尝试获取视频时（为了简化，请将其写入flv文件）：
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. \! filesink location=1.flv
我得到了一个错误：
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 69507879 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
libv4l2: warning v4l2 mmap buffers still mapped on close()
Freeing pipeline ...
还有一些调试信息（-vvv选项）：
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstAudioSrcClock
/GstPipeline:pipeline0/GstAlsaSrc:alsasrc0: actual-buffer-time = 200000
/GstPipeline:pipeline0/GstAlsaSrc:alsasrc0: actual-latency-time = 10000
/GstPipeline:pipeline0/GstAlsaSrc:alsasrc0.GstPad:src: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)48000, channels=(int)1
/GstPipeline:pipeline0/GstAudioResample:audioresample0.GstPad:src: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)48000, channels=(int)1
/GstPipeline:pipeline0/GstCapsFilter:capsfilter2.GstPad:src: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)48000, channels=(int)1
/GstPipeline:pipeline0/GstQueue:queue1.GstPad:src: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)48000, channels=(int)1
/GstPipeline:pipeline0/GstVoAacEnc:voaacenc0.GstPad:sink: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)48000, channels=(int)1
/GstPipeline:pipeline0/GstVoAacEnc:voaacenc0.GstPad:sink: caps = audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)48000, channels=(int)1
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0.GstPad:src: caps = video/x-raw, format=(string)I420, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = video/x-raw, format=(string)I420, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1
/GstPipeline:pipeline0/GstVoAacEnc:voaacenc0.GstPad:src: caps = audio/mpeg, mpegversion=(int)4, channels=(int)1, rate=(int)48000, stream-format=(string)raw, level=(string)2, base-profile=(string)lc, profile=(string)lc, codec_data=(buffer)1188
/GstPipeline:pipeline0/GstOMXH264Enc-omxh264enc:omxh264enc-omxh264enc0.GstPad:sink: caps = video/x-raw, format=(string)I420, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps = video/x-raw, format=(string)I420, width=(int)640, height=(int)480, interlace-mode=(string)progressive, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1
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 561957256 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
libv4l2: warning v4l2 mmap buffers still mapped on close()
Freeing pipeline ...
我认为alsa速度或缓冲区有问题，所以有没有解决方法如何使它工作？
我也可以通过arecord或gstreamer录制声音，也没有任何问题。或者只是视频。只有通过一起捕获视频和声音才会出现问题。
由于
答案 0 :(得分：0)
问题是您的alsasrc1.0未正确安装或未安装。我会尝试以下操作：
首先尝试为gstreamer1.0另外安装alsasrc：
sudo apt-get install gstreamer1.0-alsa
有时Linux只是表现得很奇怪，虽然你已经安装了一个软件包，但合并却无法正常完成。
如果上述解决方案无效，请尝试为gstreamer0.10版本安装管道所需的所有软件包，并使用gst-launch-0.10