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• How can I check whether an RTMP live stream is working on the server side ?

  10 juin 2015, par Moyersy

  I have a site where users can broadcast their own live streams. They are provided with a URL to push their stream to over RTMP. Viewers have an embedded flash player to watch each stream.

  I need to be able to determine whether a particular stream is broadcasting. It doesn’t need to do any analysis, simply to check that there’s an actual stream at the RTMP URL.

  It seems that VLC doesn’t support RMTP.
  I’ve tried ffmpeg but not managed to solve the problem yet.

  Server is running Ubuntu.

  Bonus : How can I update the database based on the results of this stream test ?

• Decoding Video using FFMpeg for android

  29 novembre 2014, par Rahul Upadhyay

  I tried to decode video using FFMpeg library from the sample examples available on internet, i figure it out with new version of ffmpeg,
  here is the code which I called from my class file,

     private static native int decodeVideo(String filename);
  
     decodeVideo(getString(R.string._sdcard_abc_3gp));

  now in .c file located in JNI dir,I wrote this code,

   jint Java_ru_dzakhov_ffmpeg_test_MainActivity_decodeVideo(JNIEnv* env, jobject
  
  javaThis,jstring filename) {   
  
    AVFormatContext *pFormatCtx;
  
    int             i, videoStream;
  
    AVCodecContext  *pCodecCtx;
  
    AVCodec         *pCodec;
  
    AVFrame         *pFrame;
  
    AVFrame         *pFrameRGB;
  
    AVPacket        packet;
  
    int             frameFinished;
  
    int             numBytes;
  
    uint8_t         *buffer;
  
  
  
    // Register all formats and codecs
  
    av_register_all();
  
  
  
    // Open video file
  
  
  
        const jbyte *str;
  
        str = (*env)->GetStringUTFChars(env, filename, NULL);
  
  
  
        if(av_open_input_file(&pFormatCtx, str, NULL, 0, NULL)!=0)
  
        {
  
            LOGI("Can't open file '%s'\n", str);
  
            return 1;
  
        }
  
        else
  
        {
  
            LOGI("File is opened\n");
  
            LOGI("File '%s', Codec %s",pFormatCtx->filename,pFormatCtx->iformat->name);
  
        }
  
  
  
  
  
    // Dump information about file onto standard error
  
  
  
    LOGI("dump_format");
  
    dump_format(pFormatCtx, 0, filename, 0);
  
    LOGI("dump_format DONE");
  
    // Find the first video stream
  
    videoStream=-1;
  
    for(i=0; inb_streams; i++)
  
      if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO)
  
        //if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
  
        {
  
            LOGI("videoStream:: %d",videoStream);
  
        videoStream=i;
  
        break;
  
      }
  
    if(videoStream==-1)
  
      return -1; // Didn't find a video stream
  
  
  
    // Get a pointer to the codec context for the video stream
  
    pCodecCtx=pFormatCtx->streams[videoStream]->codec;
  
  
  
    // Find the decoder for the video stream
  
    pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
  
    if(pCodec==NULL) {
  
      fprintf(stderr, "Unsupported codec!\n");
  
      LOGI("Unsupported codec!\n");
  
      return -1; // Codec not found
  
    }
  
    // Open codec
  
    if(avcodec_open(pCodecCtx, pCodec)<0){
  
        LOGI("Codec Opened!\n");
  
      return -1; // Could not open codec
  
    }
  
    // Allocate video frame
  
    pFrame=avcodec_alloc_frame();
  
  
  
    // Allocate an AVFrame structure
  
    pFrameRGB=avcodec_alloc_frame();
  
    if(pFrameRGB==NULL){
  
  
  
        LOGI("checking --->>> pFrameRGB==NULL\n");
  
      return -1;
  
    }
  
    // Determine required buffer size and allocate buffer
  
  
  
    LOGI("Determine required buffer size and allocate buffer\n");
  
    numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,
  
                                pCodecCtx->height);
  
  
  
    LOGI("numBytes %d",numBytes);
  
  
  
    buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
  
  
  
    // Assign appropriate parts of buffer to image planes in pFrameRGB
  
    // Note that pFrameRGB is an AVFrame, but AVFrame is a superset
  
    // of AVPicture
  
    avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24,
  
                   pCodecCtx->width, pCodecCtx->height);
  
  
  
    // Read frames and save first five frames to disk
  
    i=0;
  
    while(av_read_frame(pFormatCtx, &packet)>=0) {
  
      // Is this a packet from the video stream?
  
      if(packet.stream_index==videoStream) {
  
        // Decode video frame
  
          avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished,&packet);
  
                             //packet.data, packet.size);
  
  
  
        // Did we get a video frame?
  
        if(frameFinished) {
  
          // Convert the image from its native format to RGB
  
          /*Temporarily down
  
           *
  
           * img_convert((AVPicture *)pFrameRGB, PIX_FMT_RGB24,
  
                      (AVPicture*)pFrame, pCodecCtx->pix_fmt, pCodecCtx->width,pCodecCtx->height);*/
  
  
  
          // Save the frame to phone memory
  
            LOGI("Saving Frame\n");
  
           SaveFrame(pFrameRGB, pCodecCtx->width, pCodecCtx->height, ++i);
  
           LOGI("After Saving Frame\n");
  
        }
  
      }
  
  
  
      // Free the packet that was allocated by av_read_frame
  
      av_free_packet(&packet);
  
    }
  
  
  
    // Free the RGB image
  
    av_free(buffer);
  
    av_free(pFrameRGB);
  
  
  
    // Free the YUV frame
  
    av_free(pFrame);
  
  
  
    // Close the codec
  
    avcodec_close(pCodecCtx);
  
  
  
    // Close the video file
  
    av_close_input_file(pFormatCtx);
  
  
  
    return 0;
  
  }

  after compiling the code i get this in log,

  07-04 10:58:38.961: D/dalvikvm(1010): Trying to load lib /data/data/ru.dzakhov.ffmpeg.test/lib/libmylib.so 0x4051e878
  
  07-04 10:58:38.971: D/dalvikvm(1010): Added shared lib /data/data/ru.dzakhov.ffmpeg.test/lib/libmylib.so 0x4051e878
  
  07-04 10:58:38.971: D/dalvikvm(1010): No JNI_OnLoad found in /data/data/ru.dzakhov.ffmpeg.test/lib/libmylib.so 0x4051e878, skipping init
  
  07-04 10:58:39.011: I/System.out(1010): Creating Engine
  
  07-04 10:58:39.011: I/mylib(1010): initiated
  
  07-04 10:58:39.011: I/System.out(1010): Decoding Video
  
  07-04 10:58:39.011: I/System.out(1010): passing video::/sdcard/NativeMedia.ts
  
  07-04 10:58:39.101: W/dalvikvm(231): disableGcForExternalAlloc: false
  
  07-04 10:58:39.121: I/DEBUG(71): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
  
  07-04 10:58:39.121: I/DEBUG(71): Build fingerprint: 'htc_asia_india/htc_icong/icong:2.3.3/GRI40/68450.5:user/release-keys'
  
  07-04 10:58:39.121: I/DEBUG(71): pid: 1010, tid: 1010  >>> ru.dzakhov.ffmpeg.test <<<
  
  07-04 10:58:39.121: I/DEBUG(71): signal 4 (SIGILL), code 1 (ILL_ILLOPC), fault addr 8102de90
  
  07-04 10:58:39.121: I/DEBUG(71):  r0 0000ac28  r1 40521b98  r2 40526340  r3 42157cc8
  
  07-04 10:58:39.121: I/DEBUG(71):  r4 bee7d368  r5 00000004  r6 40521b98  r7 42157c88
  
  07-04 10:58:39.121: I/DEBUG(71):  r8 bee7d348  r9 42157c80  10 42157c6c  fp 42f0f04c
  
  07-04 10:58:39.121: I/DEBUG(71):  ip 8102de91  sp bee7d348  lr 80018378  pc 8102de90  cpsr a0000030
  
  07-04 10:58:39.121: I/DEBUG(71):  d0  4140000041600000  d1  3ff0000041680000
  
  07-04 10:58:39.121: I/DEBUG(71):  d2  bf80000000000000  d3  0000000000000000
  
  07-04 10:58:39.121: I/DEBUG(71):  d4  0000000000000000  d5  3ff000003f800000
  
  07-04 10:58:39.121: I/DEBUG(71):  d6  bff000003f800000  d7  4160000000000000
  
  07-04 10:58:39.121: I/DEBUG(71):  d8  0000000000000000  d9  0000000000000000
  
  07-04 10:58:39.121: I/DEBUG(71):  d10 0000000000000000  d11 0000000000000000
  
  07-04 10:58:39.121: I/DEBUG(71):  d12 0000000000000000  d13 0000000000000000
  
  07-04 10:58:39.121: I/DEBUG(71):  d14 0000000000000000  d15 0000000000000000
  
  07-04 10:58:39.121: I/DEBUG(71):  scr 20000012
  
  07-04 10:58:39.221: I/DEBUG(71):          #00  pc 0002de90  /data/data/ru.dzakhov.ffmpeg.test/lib/libmylib.so
  
  07-04 10:58:39.221: I/DEBUG(71):          #01  pc 0004f13c  /system/lib/libdvm.so
  
  07-04 10:58:39.221: I/DEBUG(71):          #02  pc 0001d584  /system/lib/libdvm.so
  
  07-04 10:58:39.221: I/DEBUG(71):          #03  pc 00022b8c  /system/lib/libdvm.so
  
  07-04 10:58:39.221: I/DEBUG(71):          #04  pc 00021a80  /system/lib/libdvm.so
  
  07-04 10:58:39.221: I/DEBUG(71):          #05  pc 0006060a  /system/lib/libdvm.so
  
  07-04 10:58:39.221: I/DEBUG(71):          #06  pc 0006828e  /system/lib/libdvm.so
  
  07-04 10:58:39.221: I/DEBUG(71):          #07  pc 0001d584  /system/lib/libdvm.so
  
  07-04 10:58:39.221: I/DEBUG(71):          #08  pc 00022b8c  /system/lib/libdvm.so
  
  07-04 10:58:39.231: I/DEBUG(71):          #09  pc 00021a80  /system/lib/libdvm.so
  
  07-04 10:58:39.231: I/DEBUG(71):          #10  pc 0006045c  /system/lib/libdvm.so
  
  07-04 10:58:39.231: I/DEBUG(71):          #11  pc 0004c430  /system/lib/libdvm.so
  
  07-04 10:58:39.231: I/DEBUG(71):          #12  pc 00037638  /system/lib/libandroid_runtime.so
  
  07-04 10:58:39.231: I/DEBUG(71):          #13  pc 00038456  /system/lib/libandroid_runtime.so
  
  07-04 10:58:39.231: I/DEBUG(71):          #14  pc 00008ca2  /system/bin/app_process
  
  07-04 10:58:39.231: I/DEBUG(71):          #15  pc 00014f24  /system/lib/libc.so
  
  07-04 10:58:39.231: I/DEBUG(71): code around pc:
  
  07-04 10:58:39.231: I/DEBUG(71): 8102de70 003d9cd0 00000408 0029e598 0029e5de 
  
  07-04 10:58:39.231: I/DEBUG(71): 8102de80 0029e5d8 0029e5d8 0029e5cc 0029e5c8 
  
  07-04 10:58:39.231: I/DEBUG(71): 8102de90 4ff0e92d b0994604 f0004615 6823f945 
  
  07-04 10:58:39.231: I/DEBUG(71): 8102dea0 46294620 32a4f8d3 47982200 46044f81 
  
  07-04 10:58:39.231: I/DEBUG(71): 8102deb0 a8172300 22004621 9300447f f9c0f060 
  
  07-04 10:58:39.231: I/DEBUG(71): code around lr:
  
  07-04 10:58:39.231: I/DEBUG(71): 80018358 3497c004 3488c004 3afffff9 e2888004 
  
  07-04 10:58:39.231: I/DEBUG(71): 80018368 eafffff9 e899000c e594c008 e12fff3c 
  
  07-04 10:58:39.231: I/DEBUG(71): 80018378 e3550000 1594c00c 188c0003 e914a3f0 
  
  07-04 10:58:39.231: I/DEBUG(71): 80018388 e1a05e22 e5946004 e3a02000 e4d6c001 
  
  07-04 10:58:39.231: I/DEBUG(71): 80018398 e35c0000 0a000007 e2822001 e35c0044 
  
  07-04 10:58:39.231: I/DEBUG(71): stack:
  
  07-04 10:58:39.231: I/DEBUG(71):     bee7d308  000001b4  
  
  07-04 10:58:39.231: I/DEBUG(71):     bee7d30c  c0000000  
  
  07-04 10:58:39.231: I/DEBUG(71):     bee7d310  80018540  /system/lib/libdvm.so
  
  07-04 10:58:39.231: I/DEBUG(71):     bee7d314  0000cf98  
  
  07-04 10:58:39.231: I/DEBUG(71):     bee7d318  42157c6c  
  
  07-04 10:58:39.231: I/DEBUG(71):     bee7d31c  afd139d9  /system/lib/libc.so
  
  07-04 10:58:39.231: I/DEBUG(71):     bee7d320  0002de91  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d324  0000000e  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d328  80018540  /system/lib/libdvm.so
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d32c  00000070  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d330  42157c6c  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d334  00238100  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d338  00000000  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d33c  00000000  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d340  df002777  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d344  e3a070ad  
  
  07-04 10:58:39.241: I/DEBUG(71): #00 bee7d348  423692b4  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d34c  0000cf98  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d350  40521b98  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d354  8102de91  /data/data/ru.dzakhov.ffmpeg.test/lib/libmylib.so
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d358  80018540  /system/lib/libdvm.so
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d35c  0000cf98  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d360  bee7d368  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d364  800499df  /system/lib/libdvm.so
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d368  42157c80  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d36c  42d58795  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d370  8102de91  /data/data/ru.dzakhov.ffmpeg.test/lib/libmylib.so
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d374  bee7d418  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d378  00016de0  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d37c  0000ac28  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d380  00000001  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d384  bee7d418  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d388  42157c80  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d38c  40521b98  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d390  423692b4  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d394  800499a1  /system/lib/libdvm.so
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d398  42157c80  
  
  07-04 10:58:39.241: I/DEBUG(71):     bee7d39c  8004f13f  /system/lib/libdvm.so
  
  07-04 10:58:39.241: I/DEBUG(71): #01 bee7d3a0  00000002  
  
  07-04 10:58:39.251: I/DEBUG(71):     bee7d3a4  0000000e  
  
  07-04 10:58:39.251: I/DEBUG(71):     bee7d3a8  bee7d418  
  
  07-04 10:58:39.251: I/DEBUG(71):     bee7d3ac  0000cf98  
  
  07-04 10:58:39.251: I/DEBUG(71):     bee7d3b0  400198b8  
  
  07-04 10:58:39.251: I/DEBUG(71):     bee7d3b4  42d5861c  
  
  07-04 10:58:39.251: I/DEBUG(71):     bee7d3b8  42157c98  
  
  07-04 10:58:39.251: I/DEBUG(71):     bee7d3bc  bee7d410  
  
  07-04 10:58:39.251: I/DEBUG(71):     bee7d3c0  40521b98  
  
  07-04 10:58:39.251: I/DEBUG(71):     bee7d3c4  8001d588  /system/lib/libdvm.so

  Unable to understand what’s exact problem is there ?
  Here SaveFrame function is used it looks like,

  void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame) {
  
    FILE *pFile;
  
    char szFilename[32];
  
    int  y;
  
  
  
    // Open file
  
    LOGI("Opening file!");
  
    sprintf(szFilename, "frame%d.ppm", iFrame);
  
  
  
    pFile=fopen(szFilename, "wb");
  
    if(pFile==NULL)
  
      return;
  
  
  
    // Write header
  
    fprintf(pFile, "P6\n%d %d\n255\n", width, height);
  
    //LOGI("width::"+width+"Height::"+height);
  
    // Write pixel data
  
    for(y=0; ydata[0]+y*pFrame->linesize[0], 1, width*3, pFile);
  
    }
  
    // Close file
  
    fclose(pFile);
  
  }

  in log I didn’t get any Log which i placed in the code !

  Please help me out,

  Thanks

• Back on the Salty Track

  12 juin 2011, par Multimedia Mike — General

  After I posted about my initial encounter and frustration with Google’s Native Client (NaCl) SDK and took a deep breath, I realized that I achieved an important proof of concept— I successfully played music using the NaCl SDK audio output interface. Then I started taking a closer read through the (C-based set of) header files and realized I might be able to make a go of it after all. I had much better luck this time and managed to create a proper Native Client interface that allows for controlling playback, presenting metadata, and toggling individual voices (a fascinating tool for studying classic game music).

  I haven’t bothered to post the actual plugin because, really, what’s the point ? I started with NaCl SDK 0.3 which requires Chrome 12, which means terribly limited reach, even among Chrome users. At least, that was true when I restarted this little project. Chrome 12 was formally released this past week. Chrome development really does move at breakneck pace.

  Anyway, here is a static screenshot of what the plugin currently looks like :

  
  
  

  Not pretty, but it does the job.

  Dev Journal
  Various notes based on this outing :

  • Portability : I tested my plugin using Chrome 12 on 64-bit Windows, Mac, and Linux. Mac and Linux both work ; Windows does not.
  • Build System : SDK 0.3 is still lacking in its ability to compile .cpp files (instead of .cc files) ; necessary because libgme is C++ using .cpp files. This requires some build system modification.
  • Getting the interfaces : This is where I got tripped up the first time around. get_browser_interface() from their example actually refers to a parameter passed in through the PPP_InitializeModule() function. The SDK’s template generator renames this to get_browser().
  • Debugging : I feel unstoppable once I have a printf() mechanism available to me during development. To that end, console.log() from JavaScript outputs to Chrome’s built-in JavaScript console log while putting printf() statements in the actual NaCl plugin causes the messages to show up in /.xsession-errors on Linux/X.
  • Size Matters : The binaries generated with the NaCl 0.3 SDK are ridiculously huge. The basic "Hello World" example in C compiles to binaries that are 6.7 MB and 7.8 MB for the 32- and 64-bit builds, respectively. This made me apprehensive to build a full version of SaltyGME that contains all the bells and whistles offered by the library. However, all of the GME code compiled into the binary adds very little size. Curiously, the C++ version of "Hello World" only ranges from 1.8-2.0 MB for 32- and 64-bit. Is there some kind of C tax happening here ? Note that running ’strip’ on the resulting .nexe files (they’re ELF files, after all) brings the sizes down into the C++ range, but at the cost of causing them to not work (more specifically, not even load).
  • No Messaging : The NaCl SDK is supposed to have a messaging interface which allows the NaCl plugin to send asynchronous messages up to the hosting page. When I try to instantiate it, I get a NULL. I’m stuck with the alternative of polling from the JavaScript side to, e.g., determine when a song has finished loading via the network.

  That’s all I can think of for now. I may work on this a little more (I’d like to at least see some audio visualization). Maybe Google will enable NaCl per default sometime around Chrome 21 and this program will be ready for prime time by then.

  See Also :

  • My first attempt at this same project