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• Set presentation timestamps on sample buffers before giving them to AVSampleBufferDisplayLayer

  6 octobre 2016, par Moustik

  I am trying to decode and render a H264 video network stream using AVSampleBufferDisplayLayer on iOS 10.

  I am getting the frame packets using ffmpeg. Then, I am converting the NALUs to AVCC format and creating sample buffers. Finally I pass the buffers to the AVSampleBufferDisplayLayer for rendering. The stream is displaying well when kCMSampleAttachmentKey_DisplayImmediately is set to kCFBooleanTrue.
  However when I am trying to use a controlTimebase in order to define the presentation timestamps, the display is quite stuck.

  Any idea or help with the handling of presentation timestamps ?

  AVPacket packet;
  
  av_read_frame(_formatCtx, &packet);
  
  
  
  // ...
  
  // Parse NALUs and create blockbuffer
  
  // ...
  
  
  
  AVStream *st = _formatCtx->streams[_videoStream];
  
  
  
  CMSampleTimingInfo* timing;
  
  timing = malloc(sizeof(CMSampleTimingInfo));
  
  timing->presentationTimeStamp = CMTimeMake(packet.pts, st->time_base.den);
  
  timing->duration = CMTimeMake(packet.duration, st->time_base.den);
  
  timing->decodeTimeStamp = CMTimeMake(packet.dts, st->time_base.den);
  
  
  
  const size_t sampleSize = blockLength;
  
  _status = CMSampleBufferCreate(kCFAllocatorDefault,
  
                                 blockBuffer, true, NULL, NULL,
  
                                 _formatDescriptionRef, 1, 1, timing, 1,
  
                                 &sampleSize, &sampleBuffer);
  
  
  
  [self.renderer enqueueSampleBuffer:sampleBuffer];

• hls.js - how to subscribe to any event

  24 octobre 2016, par momomo

  First time I play a playlist, I keep getting bufferStalledError.

  I can detect this error, however, if I resolve this error then a jump or skip in the video play back occurs and it stops occurring.

  However, if i ignore it then it will play without a noticable interruption and the video keeps playing. But this error will continue to be raised but without any noticable issues.

  However, at times, the same error will result in an overflow and hls.js won’t be able to recover automatically, and no further errors are reported after such a failure than the last bufferStalled error.

  I have to restart the video through destroy and attach again resuming the play functionality hls.js is unable to do automatically or through recoverMediaErrors().

  The only problem is that I am unable to subscribe to an event that says that the video is playing, or stuck. After a bufferStalledMediaError hls.js will recover it automatically without a glitch, but sometimes it fails to do so. In both cases no more errors are reported.

  But is there maybe another event reported that says it is playing that is not an error report ?

  Is there an hls.on(Hls.Events.ALL, ... ) event ?

  What about setting up a TimeLineController ? It’s not documented.

  Reference :
  https://github.com/dailymotion/hls.js/blob/master/API.md

• geting no result from GetStringUTFChars JNI

  9 avril 2013, par talhamalik22

  android NDK for my android application. i am stuck on the starting lines and it is not compiling further. Following is my code. It doest not compile after "str = (*env)->GetStringUTFChars(env, filename, NULL) ;". Please check my java and c code

  The java code :

  public class MyffmpegActivity extends Activity {
  
  
  
  private static native int logFileInfo(String filename);
  
  
  
  static
  
  {
  
      Log.i("HEHA", "HOHA");
  
      System.loadLibrary("mylib");
  
  }
  
  
  
  @Override
  
  protected void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.activity_myffmpeg);
  
      String path=Environment.getExternalStorageDirectory().getPath();
  
      path=path+"/test.mp4";
  
      Log.i("Name Returned is ", ":"+path);
  
  int x=logFileInfo(path);
  
  
  
  
  
  }

  The C code

  jint Java_com_example_myffmpegtest_MyffmpegActivity_logFileInfo(JNIEnv * env, jobject  this, jstring filename)
  
  {
  
  
  
  av_register_all();
  
     AVFormatContext *pFormatCtx;
  
     const jbyte *str;
  
  
  
    str = (*env)->GetStringUTFChars(env, filename, NULL);
  
   if(av_open_input_file(&pFormatCtx, str, NULL, 0, NULL)!=0)
  
   {
  
      LOGE("Can't open file '%s'\n", str);
  
      return 1;
  
  }
  
  else
  
  {
  
  
  
      LOGI("File was opened\n");
  
      LOGI("File '%s', Codec %s",
  
          pFormatCtx->filename,
  
          pFormatCtx->iformat->name
  
      );
  
  }
  
  return 0;}