avformat_open_input返回-135时出现FFMPEG错误 [英] FFMPEG error with avformat_open_input returning -135

问题描述

我有一个DLL应用程序用于从RTSP摄像机接收视频。在引擎盖下，该DLL使用此版本zip中的FFMPEG库：

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 :

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

我们内部有各种各样的相机，其中大部分都是正常工作。但是，在一个特定的Pelco型号：IXE20DN-OCP上，我无法连接。我在VLC上测试了相机和rtsp连接字符串，并且连接到相机。

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.

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

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

rtsp://IPADDRESS:554/1/stream1

奇怪的是，即使我离开VLC端口，它连接，所以我猜测它的默认RTSP端口，或VLC根据您的输入尝试各种各样的事情。

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.

无论如何，当我尝试连接时，我从av_format_open_input中收到错误。它返回代码-135。当我查看错误代码列表，我没有看到列出。为了很好的测量，我打印出错误的所有错误，只是为了看看他们的价值观。

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.

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

甚至不接近-135。我发现这个错误，堆栈溢出，这里是运行时在qt创建者中链接ffmpeg库时出错，作者声称它是一个DLL加载问题错误。我不知道是什么导致他认为，但是我遵循这些建议，并使用依赖性助行器（ http：// www.dependencywalker.com/ ）来检查它认为我的DLL需要什么依赖关系。它列出了一些，但它们已经在我的安装包中提供。

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.

为了确保它正在接收它，我手动从安装中删除它们，并观察到一个激进更改程序行为（这是我的DLL没有加载并开始运行）。

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).

所以，我有一些初始化代码： p>

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

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

然后我有我的主要打开连接例程...

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

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;
    }
...

确定我没有误会错误代码我从ffmpeg打印错误信息，但找不到错误，并返回我的固定错误消息。

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.

我的下一步将是挂钩线在我的连接尝试和VLC连接尝试，并试图找出什么差异（如果有）导致问题，我可以做什么来ffmpeg使其工作。正如我所说，我有很多其他的摄像头在家里使用RTSP，他们的工作与我的DLL。有些还使用用户名/密码/ etc（所以我知道这不是问题）。

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).

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

我要向wirehark前进，但想知道ffmpeg中-135错误代码的起源。如果'ret'设置为-135，当我查看代码时，它必须是由辅助方法返回代码而不是直接在 avformat_open_input 方法中发生的。

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.

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

升级到最新的每日ffmpeg版本后，我获得有关wireshark的数据。实时流协议：

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

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

对此的回应是我在启动时可以检测到的第一个错误。

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

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

我要猜测，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，显示：

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 :

Media Protocol: RTP/AVP

此外，当ffmpeg发布SETUP时，它指定：

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

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

我要尝试，在这里失败，选择另一种运输类型，看看它是如何工作的。仍然不知道-135来自哪里。

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.

推荐答案

解决方案原来是这个特定的相机没有支持通过TCP传输的RTSP。它需要UDP。

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

我更新到代码来尝试TCP，如果失败，要使用一组替代的UDP选项和另一个调用来尝试打开一些东西。

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.

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

像一个魅力一样工作。仍然担心error.h文件中没有出现-135和-22错误代码的起源。也许是一个ffmpeg错误，允许通过错误代码。

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.

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