由于客户端无法准备媒体，带有“rtpvrawpay”的 gstreamer 失败

如何解决由于客户端无法准备媒体，带有“rtpvrawpay”的 gstreamer 失败

我一直在玩 gstreamer 以通过 RTSP 流式传输视频，我需要帮助！

起初我想通过将数据编码为 h264 格式来流式传输视频，所以我使用了 x264enc 编码器，然后使用 rtph264pay 作为负载。

我尝试了以下命令，效果很好：

examples$ ./test-launch --gst-debug=3 '( v4l2src device=/dev/video0 ! video/x-raw,width=640,height=480,framerate=30/1 ! videoconvert ! x264enc tune=zerolatency ! rtph264pay name=pay0 pt=96 )'

但我也想尝试在没有编码器的情况下通过网络发送原始视频数据，所以我尝试使用以下命令但它失败了。

 examples$ ./test-launch --gst-debug=3 '( v4l2src device=/dev/video0 ! video/x-raw,framerate=30/1 ! rtpvrawpay name=pay0 pt=96 )'

日志在这里：

examples$ ./test-launch --gst-debug=3 '( v4l2src device=/dev/video0 ! video/x-raw,framerate=30/1 ! rtpvrawpay name=pay0 pt=96 )'
stream ready at rtsp://127.0.0.1:8554/test
0:00:04.246791630 77643 0x7f6464016cc0 FIXME                default gstutils.c:3980:gst_pad_create_stream_id_internal:<appsrc0:src> Creating random stream-id,consider implementing a deterministic way of creating a stream-id
0:00:04.246814474 77643 0x7f6464016c60 FIXME                default gstutils.c:3980:gst_pad_create_stream_id_internal:<appsrc1:src> Creating random stream-id,consider implementing a deterministic way of creating a stream-id
0:00:04.247156839 77643 0x7f6464016d20 WARN                 basesrc gstbasesrc.c:3072:gst_base_src_loop:<v4l2src0> error: Internal data stream error.
0:00:04.247209181 77643 0x7f6464016d20 WARN                 basesrc gstbasesrc.c:3072:gst_base_src_loop:<v4l2src0> error: streaming stopped,reason not-negotiated (-4)
0:00:04.246846899 77643 0x7f646c003400 WARN                 v4l2src gstv4l2src.c:695:gst_v4l2src_query:<v4l2src0> Can't give latency since framerate isn't fixated !
0:00:04.247422399 77643 0x7f646c003400 WARN                 v4l2src gstv4l2src.c:695:gst_v4l2src_query:<v4l2src0> Can't give latency since framerate isn't fixated !
0:00:04.249446256 77643 0x7f646c003400 WARN               rtspmedia rtsp-media.c:1834:default_handle_message: 0x7f646c034160: got error Internal data stream error. (gstbasesrc.c(3072): gst_base_src_loop (): /GstPipeline:media-pipeline/GstBin:bin0/GstV4l2Src:v4l2src0:
streaming stopped,reason not-negotiated (-4))
0:00:04.249557496 77643 0x561f080aaf60 WARN               rtspmedia rtsp-media.c:2127:wait_preroll: failed to preroll pipeline
0:00:04.249603261 77643 0x561f080aaf60 WARN               rtspmedia rtsp-media.c:2384:gst_rtsp_media_prepare: failed to preroll pipeline
0:00:04.254686872 77643 0x561f080aaf60 ERROR             rtspclient rtsp-client.c:678:find_media: client 0x561f080b58b0: can't prepare media
0:00:04.254996068 77643 0x561f080aaf60 ERROR             rtspclient rtsp-client.c:2210:handle_describe_request: client 0x561f080b58b0: no media
0:00:04.271635553 77643 0x7f6464016c00 FIXME                default gstutils.c:3980:gst_pad_create_stream_id_internal:<appsrc3:src> Creating random stream-id,consider implementing a deterministic way of creating a stream-id
0:00:04.271635725 77643 0x7f646c003f60 FIXME                default gstutils.c:3980:gst_pad_create_stream_id_internal:<appsrc2:src> Creating random stream-id,consider implementing a deterministic way of creating a stream-id
0:00:04.271760281 77643 0x561f080aaf60 WARN                 v4l2src gstv4l2src.c:695:gst_v4l2src_query:<v4l2src1> Can't give latency since framerate isn't fixated !
0:00:04.272014291 77643 0x7f646c003ea0 WARN                 basesrc gstbasesrc.c:3072:gst_base_src_loop:<v4l2src1> error: Internal data stream error.
0:00:04.272047911 77643 0x7f646c003ea0 WARN                 basesrc gstbasesrc.c:3072:gst_base_src_loop:<v4l2src1> error: streaming stopped,reason not-negotiated (-4)
0:00:04.272645141 77643 0x561f080aaf60 WARN               rtspmedia rtsp-media.c:1834:default_handle_message: 0x7f646c0348e0: got error Internal data stream error. (gstbasesrc.c(3072): gst_base_src_loop (): /GstPipeline:media-pipeline/GstBin:bin1/GstV4l2Src:v4l2src1:
streaming stopped,reason not-negotiated (-4))
0:00:04.272711585 77643 0x7f646c003400 WARN               rtspmedia rtsp-media.c:2127:wait_preroll: failed to preroll pipeline
0:00:04.272742948 77643 0x7f646c003400 WARN               rtspmedia rtsp-media.c:2384:gst_rtsp_media_prepare: failed to preroll pipeline
0:00:04.277308540 77643 0x7f646c003400 ERROR             rtspclient rtsp-client.c:678:find_media: client 0x561f080b59a0: can't prepare media
0:00:04.277484803 77643 0x7f646c003400 ERROR             rtspclient rtsp-client.c:1993:handle_setup_request: client 0x561f080b59a0: media '/test' not found

我使用的摄像头是 USB 摄像头，来自

$ v4l2-ctl -d /dev/video0 --list-formats
ioctl: VIDIOC_ENUM_FMT
    Type: Video Capture

    [0]: 'YUYV' (YUYV 4:2:2)
    [1]: 'MJPG' (Motion-JPEG,compressed)

为什么我不能通过 RTSP 流式传输原始图像数据？

谢谢，

解决方法

这些是 rtpvrawpay 接受作为输入的格式：

format: { (string)RGB,(string)RGBA,(string)BGR,(string)BGRA,(string)AYUV,(string)UYVY,(string)I420,(string)Y41B,(string)UYVP }

虽然您的相机似乎只列出 YUYV，但它不是受支持的格式之一。您可能还需要在此管道中插入一个 videoconvert。

YUYV -> UYVY 转换应该只是重新排列数据，因此应该是无损转换。