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• libx264 : Pass the reordered_opaque field through the encoder

  11 octobre 2018, par Martin Storsjö

  libx264 : Pass the reordered_opaque field through the encoder
  libx264 does have a field for opaque data to pass along with frames
  
  through the encoder, but it is a pointer, while the libavcodec
  
  reordered_opaque field is an int64_t. Therefore, allocate an array
  
  within the libx264 wrapper, where reordered_opaque values in flight
  
  are stored, and pass a pointer to this array to libx264.
  Update the public libavcodec documentation for the AVCodecContext
  
  field to explain this usage, and add a codec capability that allows
  
  detecting whether an encoder handles this field.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavcodec/avcodec.h
  • [DBH] libavcodec/libx264.c
  • [DBH] libavcodec/version.h

• ffv1 : Pass correct pointers to av_free()

  20 avril 2015, par Diego Biurrun

  ffv1 : Pass correct pointers to av_free()
  Bug-Id : CID 1295124
  

  • [DH] libavcodec/ffv1.c

• Android - How can I pass camera stream to ffmpeg, using Camera2 library ?

  29 mars 2021, par Juan José Cetraro

  I am trying to create an app that shows the camera of the device on the screen, and also streams the camera by srt. To do this, I am using Camera2 library, and ffmpeg (in partucular I am using https://github.com/tanersener/mobile-ffmpeg, that is a ffmpeg wrapper for Android).

  


  My plan is to get the camera stream using Camera2 (using the method onImageAvailable on ImageReader.OnImageAvailableListener class), and send this stream to udp ://localhost:1234. Then, I can use ffmpeg to get that stream by udp, and send it by srt.

  


  I've already solved the part of sending the stream by srt using ffmpeg, and it works fine. In fact, if I set "android_camera" as the input of my ffmpeg command, my app works ok. The problem with this approach, is that if I do that, I block the access to the camera, so I can't show the camera on the screen with another library.

  


  I also found a code that uses Camera2 to stream the camera by udp, and it works, but the problem with this code is that converts each frame to bitmap before sending it by udp, and it makes that it is not performant.

  


  So, I need to know which is the best way to pass the data by udp to ffmpeg, so ffmpeg could process it and send it by srt ?

  


  Camera2 let me to configure which format I want to receive the frames on my listener :

  


  ImageReader.newInstance(1280, 720, ImageFormat.JPEG, /*maxImages*/2);


  


  In this example I am setting JPEG as ImageFormat, but here I let you all the available formats I could use :

  


  UNKNOWN, RGB_565, YV12, Y8, Y16, NV16, NV21, YUY2, JPEG, DEPTH_JPEG, YUV_420_888, YUV_422_888, YUV_444_888, FLEX_RGB_888, FLEX_RGBA_8888, RAW_SENSOR, RAW_PRIVATE, RAW10, RAW12, DEPTH16, DEPTH_POINT_CLOUD, RAW_DEPTH, PRIVATE, HEIC

  


  This is the method where I am going to receive each frame, and what I need to know is what kind of transformation I have to do before sending the frame by udp to ffmpeg ? :

  


  @Override
public void onImageAvailable(ImageReader reader) {

}


  


  Thanks in advance for reading the question :)