返回-135 avformat_open_input时出现FFMPEG错误

I have a DLL one of my applications uses to receive video from RTSP cameras. Under the hood, the DLL uses FFMPEG libs from this release zip :

我有一个DLL，我的一个应用程序用于从RTSP摄像头接收视频。在引擎盖下，DLL使用此发行版zip中的FFMPEG库：

ffmpeg-20141022-git-6dc99fd-win64-shared.7z

We have a wide variety of cameras in house and most of them work just fine. However, on one particular Pelco Model Number: IXE20DN-OCP, I am unable to connect. I tested the camera and rtsp connection string on VLC and it connects to the camera just fine.

我们内部有各种各样的相机，大部分工作都很好。但是，在一个特定的Pelco型号：IXE20DN-OCP上，我无法连接。我测试了VLC上的摄像头和rtsp连接字符串，它连接到摄像头就好了。

I found the connection string here : http://www.ispyconnect.com/man.aspx?n=Pelco

我在这里找到了连接字符串：http：//www.ispyconnect.com/man.aspx？n = Pelco

rtsp://IPADDRESS:554/1/stream1

Oddly, even if I leave the port off of VLC, it connects, so I'm guessing its the default RTSP port or that VLC tries a variety of things based on your input.

奇怪的是，即使我将端口从VLC上移开，它也会连接，所以我猜它是默认的RTSP端口，或者VLC会根据你的输入尝试各种各样的东西。

In any case, when I attempt to connect, I get an error from av_format_open_input. It returns a code of -135. When I looked in the error code list I didn't see that listed. For good measure, I printed out all the errors in error.h just to see what their values were.

在任何情况下，当我尝试连接时，我从av_format_open_input收到错误。它返回-135的代码。当我查看错误代码列表时，我没有看到列出的内容。为了更好的衡量，我打印出error.h中的所有错误，只是为了看看它们的值是什么。

DumpErrorCodes - Error Code : AVERROR_BSF_NOT_FOUND = -1179861752
DumpErrorCodes - Error Code : AVERROR_BUG = -558323010
DumpErrorCodes - Error Code : AVERROR_BUFFER_TOO_SMALL = -1397118274
DumpErrorCodes - Error Code : AVERROR_DECODER_NOT_FOUND = -1128613112
DumpErrorCodes - Error Code : AVERROR_DEMUXER_NOT_FOUND = -1296385272
DumpErrorCodes - Error Code : AVERROR_ENCODER_NOT_FOUND = -1129203192
DumpErrorCodes - Error Code : AVERROR_EOF = -541478725
DumpErrorCodes - Error Code : AVERROR_EXIT = -1414092869
DumpErrorCodes - Error Code : AVERROR_EXTERNAL = -542398533
DumpErrorCodes - Error Code : AVERROR_FILTER_NOT_FOUND = -1279870712
DumpErrorCodes - Error Code : AVERROR_INVALIDDATA = -1094995529
DumpErrorCodes - Error Code : AVERROR_MUXER_NOT_FOUND = -1481985528
DumpErrorCodes - Error Code : AVERROR_OPTION_NOT_FOUND = -1414549496
DumpErrorCodes - Error Code : AVERROR_PATCHWELCOME = -1163346256
DumpErrorCodes - Error Code : AVERROR_PROTOCOL_NOT_FOUND = -1330794744
DumpErrorCodes - Error Code : AVERROR_STREAM_NOT_FOUND = -1381258232
DumpErrorCodes - Error Code : AVERROR_BUG2 = -541545794
DumpErrorCodes - Error Code : AVERROR_UNKNOWN = -1313558101
DumpErrorCodes - Error Code : AVERROR_EXPERIMENTAL = -733130664
DumpErrorCodes - Error Code : AVERROR_INPUT_CHANGED = -1668179713
DumpErrorCodes - Error Code : AVERROR_OUTPUT_CHANGED = -1668179714
DumpErrorCodes - Error Code : AVERROR_HTTP_BAD_REQUEST = -808465656
DumpErrorCodes - Error Code : AVERROR_HTTP_UNAUTHORIZED = -825242872
DumpErrorCodes - Error Code : AVERROR_HTTP_FORBIDDEN = -858797304
DumpErrorCodes - Error Code : AVERROR_HTTP_NOT_FOUND = -875574520
DumpErrorCodes - Error Code : AVERROR_HTTP_OTHER_4XX = -1482175736
DumpErrorCodes - Error Code : AVERROR_HTTP_SERVER_ERROR = -1482175992

Nothing even close to -135. I did find this error, sort of on stack overflow, here runtime error when linking ffmpeg libraries in qt creator where the author claims it is a DLL loading problem error. I'm not sure what led him to think that, but I followed the advice and used the dependency walker (http://www.dependencywalker.com/) to checkout what dependencies it thought my DLL needed. It listed a few, but they were already provided in my install package.

什么都没有接近-135。我确实发现了这个错误，有点堆栈溢出，这里运行时错误链接在qt creator中的ffmpeg库，其中作者声称它是一个DLL加载问题错误。我不确定是什么导致他这么想，但我遵循了建议并使用依赖walker（http://www.dependencywalker.com/）来检查它认为我的DLL需要什么依赖项。它列出了一些，但它们已经在我的安装包中提供了。

To make sure it was picking them up, I manually removed them from the install and observed a radical change in program behavior(that being my DLL didn't load and start to run at all).

为了确保它正在捡起它们，我手动将它们从安装中删除，并观察到程序行为发生了根本变化（这是我的DLL没有加载并开始运行）。

So, I've got a bit of init code :

所以，我有一些初始化代码：

void FfmpegInitialize()
{
 av_lockmgr_register(&LockManagerCb);
 av_register_all();
 LOG_DEBUG0("av_register_all returned\n");
}

Then I've got my main open connection routine ...

然后我有了我的主要开放连接例程......

int RTSPConnect(const char *URL, int width, int height, frameReceived callbackFunction)
{

    int errCode =0;
    if ((errCode = avformat_network_init()) != 0)
    {
        LOG_ERROR1("avformat_network_init returned error code %d\n", errCode);  
    }
    LOG_DEBUG0("avformat_network_init returned\n");
    //Allocate space and setup the the object to be used for storing all info needed for this connection
    fContextReadFrame = avformat_alloc_context(); // free'd in the Close method

    if (fContextReadFrame == 0)
    {
        LOG_ERROR1("Unable to set rtsp_transport options.   Error code = %d\n", errCode);
        return FFMPEG_OPTION_SET_FAILURE;
    }

    LOG_DEBUG1("avformat_alloc_context returned %p\n", fContextReadFrame);

    AVDictionary *opts = 0;
    if ((errCode = av_dict_set(&opts, "rtsp_transport", "tcp", 0)) < 0)
    {
        LOG_ERROR1("Unable to set rtsp_transport options.   Error code = %d\n", errCode);
        return FFMPEG_OPTION_SET_FAILURE;
    }
    LOG_DEBUG1("av_dict_set returned %d\n", errCode);

    //open rtsp
    DumpErrorCodes();
    if ((errCode = avformat_open_input(&fContextReadFrame, URL, NULL, &opts)) < 0)
    {
        LOG_ERROR2("Unable to open avFormat RF inputs.   URL = %s, and Error code = %d\n", URL, errCode);       
        LOG_ERROR2("Error Code %d = %s\n", errCode, errMsg(errCode));       
        // NOTE context is free'd on failure.
        return FFMPEG_FORMAT_OPEN_FAILURE;
    }
...

To be sure I didn't misunderstand the error code I printed the error message from ffmpeg but the error isn't found and my canned error message is returned instead.

为了确保我没有误解错误代码，我从ffmpeg打印了错误消息，但找不到错误，而是返回了我的预设错误消息。

My next step was going to be hooking up wireshark on my connection attempt and on the VLC connection attempt and trying to figure out what differences(if any) are causing the problem and what I can do to ffmpeg to make it work. As I said, I've got a dozen other cameras in house that use RTSP and they work with my DLL. Some utilize usernames/passwords/etc as well(so I know that isn't the problem).

我的下一步是在我的连接尝试和VLC连接尝试上连接wireshark并试图找出导致问题的差异（如果有的话）以及我可以做些什么来使ffmpeg使其工作。正如我所说，我内部有十几台使用RTSP的相机，它们与我的DLL配合使用。有些人也使用用户名/密码/等（所以我知道这不是问题）。

Also, my run logs :

另外，我的运行日志：

FfmpegInitialize - av_register_all returned
Open - Open called.  Pointers valid, passing control.
Rtsp::RtspInterface::Open - Rtsp::RtspInterface::Open called
Rtsp::RtspInterface::Open - VideoSourceString(35) = rtsp://192.168.14.60:554/1/stream1
Rtsp::RtspInterface::Open - Base URL = (192.168.14.60:554/1/stream1)
Rtsp::RtspInterface::Open - Attempting to open (rtsp://192.168.14.60:554/1/stream1) for WxH(320x240) video
RTSPSetFormatH264 - RTSPSetFormatH264
RTSPConnect - Called
LockManagerCb - LockManagerCb invoked for op 1
LockManagerCb - LockManagerCb invoked for op 2
RTSPConnect - avformat_network_init returned
RTSPConnect - avformat_alloc_context returned 019E6000
RTSPConnect - av_dict_set returned 0
DumpErrorCodes - Error Code : AVERROR_BSF_NOT_FOUND = -1179861752
...
DumpErrorCodes - Error Code : AVERROR_HTTP_SERVER_ERROR = -1482175992
RTSPConnect - Unable to open avFormat RF inputs.   URL = rtsp://192.168.14.60:554/1/stream1, and Error code = -135
RTSPConnect - Error Code -135 = No Error Message Available

I'm going to move forward with wireshark but would like to know the origin of the -135 error code from ffmpeg. When I look at the code if 'ret' is getting set to -135, it must be happening as a result of the return code from a helper method and not directly in the avformat_open_input method.

我将继续使用wireshark，但想知道来自ffmpeg的-135错误代码的来源。当我查看代码是否'ret'设置为-135时，它必须是由辅助方法的返回代码而不是直接在avformat_open_input方法中发生的。

https://www.ffmpeg.org/doxygen/2.5/libavformat_2utils_8c_source.html#l00398

After upgrading to the latest daily ffmpeg build, I get data on wireshark. Real Time Streaming Protocol :

升级到最新的每日ffmpeg版本后，我获得了有关wireshark的数据。实时流媒体协议：

Request: SETUP rtsp://192.168.14.60/stream1/track1 RTSP/1.0\r\n
Method: SETUP
URL: rtsp://192.168.14.60/stream1/track1
Transport: RTP/AVP/TCP;unicast;interleaved=0-1
CSeq: 3\r\n
User-Agent: Lavf56.31.100\r\n
\r\n

The response to that is the first 'error' that I can detect in the initiation.

对此的回应是我在启动时可以检测到的第一个“错误”。

Response: RTSP/1.0 461 Unsupported Transport\r\n
Status: 461
CSeq: 3\r\n
Date: Sun, Jan 04 1970 16:03:05 GMT\r\n
\r\n

I'm going to guess that... it means the transport we selected was unsupported. I quick check of the code reveals I picked 'tcp'. Looking through the reply to the DESCRIBE command, it appears :

我猜测......这意味着我们选择的运输不受支持。我快速检查代码显示我选择'tcp'。查看对DESCRIBE命令的回复，它显示为：

Media Protocol: RTP/AVP

Further, when SETUP is issued by ffmpeg, it specifies :

此外，当由ffmpeg发出SETUP时，它指定：

Transport: RTP/AVP/TCP;unicast;interleaved=0-1

I'm going to try, on failure here to pick another transport type and see how that works. Still don't know where the -135 comes from.

我将尝试，在这里失败，选择另一种传输类型，看看它是如何工作的。仍然不知道-135来自哪里。

1 个解决方案

#1

The solution turned out to be that this particular camera didn't support RTSP over TCP transport. It wanted UDP.

解决方案原来是这个特定的相机不支持RTSP over TCP传输。它想要UDP。

I updated to code to try TCP and if that failed, to use an alternate set of options for UDP and another call to try an open things up.

我更新了代码以尝试TCP，如果失败，使用UDP的备用选项集和另一个调用尝试打开的东西。

if ((errCode = av_dict_set(&opts, "rtsp_transport", "udp", 0)) < 0)

Works like a charm. Still concerned about the origin of the -135 and -22 error codes which don't appear in the error.h file. Maybe an ffmpeg bug where a stray error code is allowed through.

奇迹般有效。仍然关注-135和-22错误代码的来源，它们没有出现在error.h文件中。也许是一个允许通过错误代码的ffmpeg错误。

#1