FFmpeg NaCl模块avformat_open_input（在rtsp流上）返回-5：I / O错误 [英] FFmpeg NaCl module avformat_open_input (on rtsp stream) returns -5: I/O error

问题描述

我想在Chrome PNaCl中创建一个RTSP播放器。

我已经成功构建了ffmpeg naclport，包括 build.sh 文件为ffmpeg NaCl端口。

- 启用网络--enable-protocols --enable-demuxer = rtsp --enable-demux = rtp --enable-demuxer = sdp --enable-decoder = h264

此外，我已经成功编码并链接了我自己的ffmpeg NaCl端口PNaCl模块。我已经在manifest.json文件中包含以下网络权限：

 权限：[
 {
socket：[
tcp-listen：*：*，
tcp-connect：*：*，
resolve-host：*：* b $ budp-bind：*：*，
udp-send-to：*：*
]，
} 
  

现在，一旦我运行以下代码，在PNaCl中， avformat_open_input（...）返回-5或I / O错误：

  AVFormatContext * formatContext = avformat_alloc_context（）; 
 
 av_register_all（）; 
 
 avformat_network_init（）; 
 
 const char * stream_path =rtsp：//184.72.239.149/vod/mp4：BigBuckBunny_115k.mov; 
 
 int result = avformat_open_input（& formatContext，stream_path，NULL，NULL）; 
 
 if（result< 0）{
 
 PostMessage（input not opened，result：）; 
 
 PostMessage（result）; 
 
} else {
 
 PostMessage（std :: string（input successfully opened））; 
 
} 
  

我可能做错了什么，为什么不能PNaCl模块访问RTSP流？

PS。 这是一个类似的问题，但它没有确定的答案。

解决方案

您是否致电 avformat_open_input 从你的主线程？似乎socket操作被阻止在主线程中工作。

尝试将代码移动到后台线程，或者更好的是使用ppapi_simple，因为这会自动执行你的代码在后台线程。

I want to create an RTSP player in Chrome PNaCl.

I have successfully built the ffmpeg naclport including the following networking flags in the build.sh file for the ffmpeg NaCl port.

--enable network --enable-protocols --enable-demuxer=rtsp --enable-demux=rtp --enable-demuxer=sdp --enable-decoder=h264

Furthermore, I have successfully coded and the linked the ffmpeg NaCl port in my own PNaCl module. I have included the following network permissions in the manifest.json file:

"permissions": [
{
    "socket": [
        "tcp-listen:*:*", 
        "tcp-connect:*:*", 
        "resolve-host:*:*", 
        "udp-bind:*:*", 
        "udp-send-to:*:*"
    ],
}

Now once I run the following code, in PNaCl, the avformat_open_input(...) returns -5 or I/O Error:

    AVFormatContext* formatContext = avformat_alloc_context();

    av_register_all();

    avformat_network_init();

    const char * stream_path = "rtsp://184.72.239.149/vod/mp4:BigBuckBunny_115k.mov";

    int result = avformat_open_input(&formatContext, stream_path ,NULL,NULL);

    if(result< 0){

        PostMessage("input not opened, result: ");

        PostMessage(result);

    }else{

      PostMessage(std::string("input successfully opened"));

    }

What am I possibly doing wrong, and why can't the PNaCl module access the RTSP stream?

PS. This is a similar question, but it gives no definitive answer.

解决方案

Are you calling avformat_open_input from your main thread? It seems like socket operations are blocked from working in the main thread.

Try moving your code to a background thread or, better yet, use ppapi_simple as this automatically executes your code in a background thread.

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