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• how to use the pts in ffmpeg

  2 décembre 2016, par Allan

  I have a library with can provide video data and PTS. The library head file Like this：

   /**
  
   * \brief           Write mirror video H.264 frame to player.
  
   * \param p_src     Pointer to source buffer.
  
   * \param size      H.264 frame size. (unit: byte)
  
   * \param ptsValue  PTS value.
  
   * \return          Copied size. (unit: byte)
  
   */
  
  int (*WriteMirrorVideoData)(const std::string& ip, const void *p_src, int size, double ptsValue);

  As you see, the library give me video frame buffer address and PTS.

  I use FFMpeg to decode video data correctly.

  My question is how to control the display time by ptsValue which provided by library.

  Did I need to set the ptsValue to AVFrame ? then FFMPeg can control the display time itself.
  Or I need to control the display by my own code ?

  I am a newer to FFMpeg. please help me. Thank you very much !

• JavaCV/FFmpeg causes crash only on Lollipop

  13 novembre 2015, par WeirdHat

  I get reports of this crash from users of my app on Galaxy Note devices running Android Lollipop (might happen on other devices but the majority of my users have Galaxy Note because it’s a drawing app). Below is the relevant code from my ASyncTask which exports a series of images (plus audio) to a video file using JavaCV/FFmpeg, and the stack trace from the reported crash. It works fine on my Note 8.0 running KitKat (there’s no Lollipop update available for that device), and works fine in Lollipop on the emulator, so I’m having a hard time tracking down the cause and don’t know what to do.

  @Override
  
  protected String doInBackground(final File... params) {
  
      FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(params[0],canvas_width,canvas_height, 0);
  
      FrameGrabber audiograbber = null;
  
      if(audio!=null) audiograbber = new FFmpegFrameGrabber(audio);
  
      Frame audioframe;
  
      Frame image;
  
      AndroidFrameConverter converter = new AndroidFrameConverter();
  
  
  
      try {
  
          recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);
  
          recorder.setFrameRate(framerate);
  
          recorder.setPixelFormat(0);
  
          if(audio!=null) {
  
              audiograbber.setFrameRate(framerate);
  
              audiograbber.start();
  
              recorder.setAudioChannels(audiograbber.getAudioChannels());
  
              recorder.setSampleRate(audiograbber.getSampleRate());
  
          }
  
          recorder.start();
  
  
  
          Bitmap drawframe = createBitmap(canvas_width, canvas_height, Bitmap.Config.ARGB_8888);
  
          Canvas c = new Canvas(drawframe);
  
          Paint p = new Paint();
  
  
  
          for(int frame=0; frame/code to draw image
  
  
  
              image = converter.convert(drawframe);
  
              recorder.record(image);
  
          }
  
  
  
          if(isCancelled()) {
  
              bgbitmap.recycle();
  
              drawframe.recycle();
  
              return "Cancelled";
  
          }
  
  
  
          if(audio!=null) {
  
              while((audioframe = audiograbber.grabFrame()) != null) {
  
                  recorder.record(audioframe);
  
              }
  
          }
  
  
  
          recorder.stop();
  
          bgbitmap.recycle();
  
          drawframe.recycle();
  
          if(audio!=null) audiograbber.stop();
  
          return "Saved "+params[0];
  
      } catch (Exception e) {
  
          e.printStackTrace();
  
      }
  
      return "Failed";
  
  }

  -

  *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
  
  Build fingerprint: 'samsung/treltexx/trelte:5.1.1/LMY47X/N910CXXU1COH4:user/release-keys'
  
  Revision: '21'
  
  ABI: 'arm'
  
  pid: 12039, tid: 12053, name: GCDaemon  >>> com.weirdhat.roughanimator <<<
  
  signal 6 (SIGABRT), code -6 (SI_TKILL), fault addr --------
  
  Abort message: 'sart/runtime/gc/collector/mark_sweep.cc:381] Can't mark invalid object'
  
      r0 00000000  r1 00002f15  r2 00000006  r3 00000000
  
      r4 b366bdb8  r5 00000006  r6 00000002  r7 0000010c
  
      r8 00000001  r9 b446f550  sl b4429000  fp 9a975c60
  
      ip 00002f15  sp b366b008  lr b6db9cb9  pc b6ddd3ac  cpsr 60070010
  
  
  
  backtrace:
  
      #00 pc 0003b3ac  /system/lib/libc.so (tgkill+12)
  
      #01 pc 00017cb5  /system/lib/libc.so (pthread_kill+52)
  
      #02 pc 000188c7  /system/lib/libc.so (raise+10)
  
      #03 pc 00015165  /system/lib/libc.so (__libc_android_abort+36)
  
      #04 pc 00012fac  /system/lib/libc.so (abort+4)
  
      #05 pc 00242f17  /system/lib/libart.so (art::Runtime::Abort()+170)
  
      #06 pc 000ad991  /system/lib/libart.so (art::LogMessage::~LogMessage()+1360)
  
      #07 pc 0013ec53  /system/lib/libart.so (bool art::gc::accounting::HeapBitmap::AtomicTestAndSet(art::mirror::Object const*, art::gc::collector::MarkSweepMarkObjectSlowPath const&)+422)
  
      #08 pc 0013ed27  /system/lib/libart.so (art::gc::collector::MarkSweep::MarkObjectParallel(art::mirror::Object const*)+142)
  
      #09 pc 0013ff23  /system/lib/libart.so (art::gc::collector::MarkSweep::MarkRootParallelCallback(art::mirror::Object**, void*, art::RootInfo const&)+26)
  
      #10 pc 0025893d  /system/lib/libart.so (art::ReferenceMapVisitor::VisitQuickFrame()+1024)
  
      #11 pc 00258cad  /system/lib/libart.so (art::ReferenceMapVisitor::VisitFrame()+224)
  
      #12 pc 0024c8e9  /system/lib/libart.so (art::StackVisitor::WalkStack(bool)+276)
  
      #13 pc 0024e617  /system/lib/libart.so (art::Thread::VisitRoots(void (*)(art::mirror::Object**, void*, art::RootInfo const&), void*)+994)
  
      #14 pc 0013ef9f  /system/lib/libart.so (art::gc::collector::CheckpointMarkThreadRoots::Run(art::Thread*)+126)
  
      #15 pc 0025b44d  /system/lib/libart.so (art::ThreadList::RunCheckpoint(art::Closure*)+296)
  
      #16 pc 0013dc0d  /system/lib/libart.so (art::gc::collector::MarkSweep::MarkRootsCheckpoint(art::Thread*, bool)+96)
  
      #17 pc 0014165d  /system/lib/libart.so (art::gc::collector::MarkSweep::PreCleanCards()+172)
  
      #18 pc 001417d3  /system/lib/libart.so (art::gc::collector::MarkSweep::MarkingPhase()+126)
  
      #19 pc 001418b9  /system/lib/libart.so (art::gc::collector::MarkSweep::RunPhases()+176)
  
      #20 pc 00138527  /system/lib/libart.so (art::gc::collector::GarbageCollector::Run(art::gc::GcCause, bool)+246)
  
      #21 pc 0015865b  /system/lib/libart.so (art::gc::Heap::CollectGarbageInternal(art::gc::collector::GcType, art::gc::GcCause, bool)+1426)
  
      #22 pc 00159af5  /system/lib/libart.so (art::gc::Heap::ConcurrentGC(art::Thread*)+56)
  
      #23 pc 000003ef  /system/framework/arm/boot.oat

• Suggest an Android FFMPEG Media Player App Supporting SRT Protocol for Video Streaming [closed]

  12 décembre 2023, par ChanduGudimetla

  I am currently in search of an Android application that can serve as a receiver or media player utilizing FFMPEG over the SRT (Secure Reliable Transport) protocol. My primary goal is to receive a video stream from one device (Device A) and mirror the screen onto another device (Device B).

  


  Source Application : I am using StreamPack APK on Device A, which handles the encoding of data effectively. Requirement : I need a receiver application for Device B that can decode this stream.

  


  The key requirements are : It should leverage FFMPEG for decoding. It must support the SRT protocol to ensure secure and reliable video streaming.