无法获得RTSP流-不匹配

Question

我正在使用Raspberry Pi3，我正在尝试通过我的无线IP摄像头获取RTSP流，但是我得到了这个错误：

pi@raspberrypi:~ $ alprd -f
INFO - Running OpenALPR daemon in the foreground.
INFO - Using: /etc/openalpr/alprd.conf for daemon configuration
Missing config value for company_id
Missing config value for pattern
INFO - Using: /home/pi/Database/pictures for storing valid plate images
INFO - country: br -- config file: /etc/openalpr/openalpr.conf
INFO - pattern: 
INFO - Stream 1: rtsp://192.168.1.230:554/onvif1
INFO - Starting camera 1
INFO - Video stream connecting...
[rtsp @ 0x71700960] Nonmatching transport in server reply
WARN - Stream rtsp://192.168.1.230:554/onvif1 failed to open.
INFO - Video stream connecting...
[rtsp @ 0x71700840] Nonmatching transport in server reply
WARN - Stream rtsp://192.168.1.230:554/onvif1 failed to open.
INFO - Video stream connecting...
[rtsp @ 0x71700960] Nonmatching transport in server reply
WARN - Stream rtsp://192.168.1.230:554/onvif1 failed to open.
INFO - Video stream connecting...
[rtsp @ 0x71700840] Nonmatching transport in server reply
WARN - Stream rtsp://192.168.1.230:554/onvif1 failed to open.
INFO - Video stream connecting...
[rtsp @ 0x71700960] Nonmatching transport in server reply
WARN - Stream rtsp://192.168.1.230:554/onvif1 failed to open.
INFO - Video stream connecting...
[rtsp @ 0x71700840] Nonmatching transport in server reply
WARN - Stream rtsp://192.168.1.230:554/onvif1 failed to open.

我使用的RTSP链接是: rtsp://192.168.1.230:554/onvif1 1

或与用户:pwd是：

rtsp://2512398:123@192.168.1.230:554/onvif1 1

它在我的alprd.conf中是这样的：

; Declare each stream on a separate line
; each unique stream should be defined as stream = [url]

stream = rtsp://192.168.1.230:554/onvif1
;stream = http://192.168.1.36:8080/video
;stream = http://127.0.0.1/example_second_stream.mjpeg
;stream = webcam

我可以使用VLC连接(在我的计算机和RPI中)，但当我在.conf文件中使用它时，为了使用命令alprd -f开始检查车牌，我得到了这个错误:/

我真的是一个编程新手，所以请不要说得太具体，因为我可能不懂哈哈。

谢谢你们！爱你们都<3

Answer 1

在OpenCV 3.4.1中，可以将env变量OPENCV_FFMPEG_CAPTURE_OPTIONS更改为"rtsp_transport;0“。

在cap_ffmpeg_impl.hpp中考虑到了这个env。

#if USE_AV_INTERRUPT_CALLBACK
    /* interrupt callback */
    interrupt_metadata.timeout_after_ms = LIBAVFORMAT_INTERRUPT_OPEN_TIMEOUT_MS;
    get_monotonic_time(&interrupt_metadata.value);

    ic = avformat_alloc_context();
    ic->interrupt_callback.callback = _opencv_ffmpeg_interrupt_callback;
    ic->interrupt_callback.opaque = &interrupt_metadata;
#endif

#if LIBAVFORMAT_BUILD >= CALC_FFMPEG_VERSION(52, 111, 0)
#ifndef NO_GETENV
    char* options = getenv("OPENCV_FFMPEG_CAPTURE_OPTIONS");
    if(options == NULL)
    {
        av_dict_set(&dict, "rtsp_transport", "tcp", 0);
    }
    else
    {
#if LIBAVUTIL_BUILD >= (LIBAVUTIL_VERSION_MICRO >= 100 ? CALC_FFMPEG_VERSION(52, 17, 100) : CALC_FFMPEG_VERSION(52, 7, 0))
        av_dict_parse_string(&dict, options, ";", "|", 0);
#else
        av_dict_set(&dict, "rtsp_transport", "tcp", 0);
#endif
    }
#else
    av_dict_set(&dict, "rtsp_transport", "tcp", 0);
#endif
    int err = avformat_open_input(&ic, _filename, NULL, &dict);
#else
    int err = av_open_input_file(&ic, _filename, NULL, 0, NULL);
#endif