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• avutil/hwcontext_dxva2 : Don’t improperly free IDirect3DSurface9 objects

  16 mai 2017, par Aaron Levinson

  avutil/hwcontext_dxva2 : Don’t improperly free IDirect3DSurface9 objects
  Add dxva2_pool_release_dummy() and use it in call to
  
  av_buffer_create() in dxva2_pool_alloc().
  Prior to this change, av_buffer_create() was called with NULL for the
  
  third argument, which indicates that av_buffer_default_free() should
  
  be used to free the buffer’s data.  Eventually, it gets to
  
  buffer_pool_free() and calls buf->free() on a surface object (which is
  
  av_buffer_default_free()).
  This can result in a crash when the debug version of the C-runtime is
  
  used on Windows.  While it doesn’t appear to result in a crash when
  
  the release version of the C-runtime is used on Windows, it likely
  
  results in memory corruption, since av_free() is being called on
  
  memory that was allocated using
  
  IDirectXVideoAccelerationService::CreateSurface().
  Signed-off-by : Aaron Levinson <alevinsn@aracnet.com>
  
  Reviewed-by : wm4 <nfxjfg@googlemail.com>
  
  Reviewed-by : Steven Liu <lingjiujianke@gmail.com>
  
  Reviewed-by : Mark Thompson <sw@jkqxz.net>
  
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  

  • [DBH] libavutil/hwcontext_dxva2.c

• Android - MediaRecorder output to stream for ffmpeg

  3 mai 2017, par TooManyEduardos

  I’m trying to stream the content of my screen to an rtmp server, and I believe the easiest/best way to do that is using ffmpeg.

  So, here’s what I have so far :

  try {
  
      Socket socket = new Socket(url, port);
  
      ParcelFileDescriptor fileDescriptor = ParcelFileDescriptor.fromSocket(socket);
  
  
  
      mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
  
      mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
  
      mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
  
      mMediaRecorder.setOutputFile(fileDescriptor.getFileDescriptor());
  
      mMediaRecorder.setVideoSize(DISPLAY_WIDTH, DISPLAY_HEIGHT);
  
      mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
  
      mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
  
      mMediaRecorder.setVideoEncodingBitRate(512 * 1000);
  
      mMediaRecorder.setVideoFrameRate(30);
  
      int rotation = getWindowManager().getDefaultDisplay().getRotation();
  
      int orientation = ORIENTATIONS.get(rotation + 90);
  
      mMediaRecorder.setOrientationHint(orientation);
  
      mMediaRecorder.prepare();
  
  } catch (IOException e) {
  
      e.printStackTrace();
  
  }

  In here, the important portion is

  Socket socket = new Socket(url, port);
  
  ParcelFileDescriptor fileDescriptor = ParcelFileDescriptor.fromSocket(socket);
  
  
  
  mMediaRecorder.setOutputFile(fileDescriptor.getFileDescriptor());

  So, when I place this inside an Asynctask I can make it attempt to send something, but I get a UnknownHostException

  java.net.UnknownHostException: Unable to resolve host "rtmps://rtmp-api....": No address associated with hostname

  So, I’ve been told that I should use ffmpeg for this instead, but I don’t know how to get the original stream from MediaRecorder to pass it to ffmpeg.

  If I understand correctly, ffmpeg be used as :

  -i original_stream rtmps://rtmp-api...

  So, how can I get output content of MediaRecorder in a format that I could use in ffmpeg for streaming (not with a saved file).

  Thanks !

• Initializing hwaccel_context in libavcodec

  3 janvier 2018, par dloman

  I am trying to get hardware accelerated video working using libavcodec. I am using the hw_decode.c example as a starting point and am unable to get it to work. both AVCodecContext->hwaccel and AVCodecContext->hwaccel_context are NULL

  I belive some part of the hwaccel is working as I see the output

  libva info: VA-API version 0.39.0
  
  libva info: va_getDriverName() returns 0
  
  libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
  
  libva info: Found init function __vaDriverInit_0_39
  
  libva info: va_openDriver() returns 0

  Which is the same as when I run

  ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i input.mpg -f null -

  but immediately after that I get the following error message

  [h264 @ 0x1df2cc0] Hardware acceleration context (hwaccel_context) does not exist.
  
  Failed to get HW surface format.
  
  [h264 @ 0x1df2cc0] decode_slice_header error
  
  [h264 @ 0x1df2cc0] no frame!

  I looked at the similar question and the answer to this shows how to get a AVCodecContext->hwaccel. But even with the AVCodecContext->hwaccel being a valid VAApih264 decoder I still get the same error message.

  How do I initialize a AVCodecContext->hwaccel_context and after that what else do I need to do to get hardware accelerated video working in ffmpeg ?