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• How to play raw h264 produced by MediaCodec encoder ?

  1er novembre 2014, par jackos2500

  I’m a bit new when it comes to MediaCodec (and video encoding/decoding in general), so correct me if anything I say here is wrong.

  I want to play the raw h264 output of MediaCodec with VLC/ffplay. I need this to play becuase my end goal is to stream some live video to a computer, and MediaMuxer only produces a file on disk rather than something I can stream with (very) low latency to a desktop. (I’m open to other solutions, but I have not found anything else that fits the latency requirement)

  Here is the code I’m using encode the video and write it to a file : (it’s based off the MediaCodec example found here, only with the MediaMuxer part removed)

  package com.jackos2500.droidtop;
  
  
  
  import android.media.MediaCodec;
  
  import android.media.MediaCodecInfo;
  
  import android.media.MediaFormat;
  
  import android.opengl.EGL14;
  
  import android.opengl.EGLConfig;
  
  import android.opengl.EGLContext;
  
  import android.opengl.EGLDisplay;
  
  import android.opengl.EGLExt;
  
  import android.opengl.EGLSurface;
  
  import android.opengl.GLES20;
  
  import android.os.Environment;
  
  import android.util.Log;
  
  import android.view.Surface;
  
  
  
  import java.io.BufferedOutputStream;
  
  import java.io.File;
  
  import java.io.FileOutputStream;
  
  import java.io.IOException;
  
  import java.nio.ByteBuffer;
  
  
  
  public class StreamH264 {
  
      private static final String TAG = "StreamH264";
  
      private static final boolean VERBOSE = true;           // lots of logging
  
  
  
      // where to put the output file (note: /sdcard requires WRITE_EXTERNAL_STORAGE permission)
  
      private static final File OUTPUT_DIR = Environment.getExternalStorageDirectory();
  
  
  
      public static int MEGABIT = 1000 * 1000;
  
      private static final int IFRAME_INTERVAL = 10;
  
  
  
      private static final int TEST_R0 = 0;
  
      private static final int TEST_G0 = 136;
  
      private static final int TEST_B0 = 0;
  
      private static final int TEST_R1 = 236;
  
      private static final int TEST_G1 = 50;
  
      private static final int TEST_B1 = 186;
  
  
  
      private MediaCodec codec;
  
      private CodecInputSurface inputSurface;
  
      private BufferedOutputStream out;
  
  
  
      private MediaCodec.BufferInfo bufferInfo;
  
      public StreamH264() {
  
  
  
      }
  
  
  
      private void prepareEncoder() throws IOException {
  
          bufferInfo = new MediaCodec.BufferInfo();
  
  
  
          MediaFormat format = MediaFormat.createVideoFormat("video/avc", 1280, 720);
  
          format.setInteger(MediaFormat.KEY_BIT_RATE, 2 * MEGABIT);
  
          format.setInteger(MediaFormat.KEY_FRAME_RATE, 30);
  
          format.setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface);
  
          format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, IFRAME_INTERVAL);
  
  
  
          codec = MediaCodec.createEncoderByType("video/avc");
  
          codec.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
  
          inputSurface = new CodecInputSurface(codec.createInputSurface());
  
          codec.start();
  
  
  
          File dst = new File(OUTPUT_DIR, "test.264");
  
          out = new BufferedOutputStream(new FileOutputStream(dst));
  
      }
  
      private void releaseEncoder() throws IOException {
  
          if (VERBOSE) Log.d(TAG, "releasing encoder objects");
  
          if (codec != null) {
  
              codec.stop();
  
              codec.release();
  
              codec = null;
  
          }
  
          if (inputSurface != null) {
  
              inputSurface.release();
  
              inputSurface = null;
  
          }
  
          if (out != null) {
  
              out.flush();
  
              out.close();
  
              out = null;
  
          }
  
      }
  
      public void stream() throws IOException {
  
          try {
  
              prepareEncoder();
  
              inputSurface.makeCurrent();
  
              for (int i = 0; i < (30 * 5); i++) {
  
                  // Feed any pending encoder output into the file.
  
                  drainEncoder(false);
  
  
  
                  // Generate a new frame of input.
  
                  generateSurfaceFrame(i);
  
                  inputSurface.setPresentationTime(computePresentationTimeNsec(i, 30));
  
  
  
                  // Submit it to the encoder.  The eglSwapBuffers call will block if the input
  
                  // is full, which would be bad if it stayed full until we dequeued an output
  
                  // buffer (which we can't do, since we're stuck here).  So long as we fully drain
  
                  // the encoder before supplying additional input, the system guarantees that we
  
                  // can supply another frame without blocking.
  
                  if (VERBOSE) Log.d(TAG, "sending frame " + i + " to encoder");
  
                  inputSurface.swapBuffers();
  
              }
  
              // send end-of-stream to encoder, and drain remaining output
  
              drainEncoder(true);
  
          } finally {
  
              // release encoder, muxer, and input Surface
  
              releaseEncoder();
  
          }
  
      }
  
  
  
      private void drainEncoder(boolean endOfStream) throws IOException {
  
          final int TIMEOUT_USEC = 10000;
  
          if (VERBOSE) Log.d(TAG, "drainEncoder(" + endOfStream + ")");
  
  
  
          if (endOfStream) {
  
              if (VERBOSE) Log.d(TAG, "sending EOS to encoder");
  
              codec.signalEndOfInputStream();
  
          }
  
          ByteBuffer[] outputBuffers = codec.getOutputBuffers();
  
          while (true) {
  
              int encoderStatus = codec.dequeueOutputBuffer(bufferInfo, TIMEOUT_USEC);
  
              if (encoderStatus == MediaCodec.INFO_TRY_AGAIN_LATER) {
  
                  // no output available yet
  
                  if (!endOfStream) {
  
                      break;      // out of while
  
                  } else {
  
                      if (VERBOSE) Log.d(TAG, "no output available, spinning to await EOS");
  
                  }
  
              } else if (encoderStatus == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {
  
                  // not expected for an encoder
  
                  outputBuffers = codec.getOutputBuffers();
  
              } else if (encoderStatus == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {
  
                  // should happen before receiving buffers, and should only happen once
  
                  MediaFormat newFormat = codec.getOutputFormat();
  
                  Log.d(TAG, "encoder output format changed: " + newFormat);
  
              } else if (encoderStatus < 0) {
  
                  Log.w(TAG, "unexpected result from encoder.dequeueOutputBuffer: " + encoderStatus);
  
                  // let's ignore it
  
              } else {
  
                  ByteBuffer encodedData = outputBuffers[encoderStatus];
  
                  if (encodedData == null) {
  
                      throw new RuntimeException("encoderOutputBuffer " + encoderStatus + " was null");
  
                  }
  
  
  
                  if ((bufferInfo.flags & MediaCodec.BUFFER_FLAG_CODEC_CONFIG) != 0) {
  
                      // The codec config data was pulled out and fed to the muxer when we got
  
                      // the INFO_OUTPUT_FORMAT_CHANGED status.  Ignore it.
  
                      if (VERBOSE) Log.d(TAG, "ignoring BUFFER_FLAG_CODEC_CONFIG");
  
                      bufferInfo.size = 0;
  
                  }
  
  
  
                  if (bufferInfo.size != 0) {
  
                      // adjust the ByteBuffer values to match BufferInfo (not needed?)
  
                      encodedData.position(bufferInfo.offset);
  
                      encodedData.limit(bufferInfo.offset + bufferInfo.size);
  
  
  
                      byte[] data = new byte[bufferInfo.size];
  
                      encodedData.get(data);
  
                      out.write(data);
  
                      if (VERBOSE) Log.d(TAG, "sent " + bufferInfo.size + " bytes to file");
  
                  }
  
  
  
                  codec.releaseOutputBuffer(encoderStatus, false);
  
  
  
                  if ((bufferInfo.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0) {
  
                      if (!endOfStream) {
  
                          Log.w(TAG, "reached end of stream unexpectedly");
  
                      } else {
  
                          if (VERBOSE) Log.d(TAG, "end of stream reached");
  
                      }
  
                      break;      // out of while
  
                  }
  
              }
  
          }
  
      }
  
      private void generateSurfaceFrame(int frameIndex) {
  
          frameIndex %= 8;
  
  
  
          int startX, startY;
  
          if (frameIndex < 4) {
  
              // (0,0) is bottom-left in GL
  
              startX = frameIndex * (1280 / 4);
  
              startY = 720 / 2;
  
          } else {
  
              startX = (7 - frameIndex) * (1280 / 4);
  
              startY = 0;
  
          }
  
  
  
          GLES20.glClearColor(TEST_R0 / 255.0f, TEST_G0 / 255.0f, TEST_B0 / 255.0f, 1.0f);
  
          GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
  
  
  
          GLES20.glEnable(GLES20.GL_SCISSOR_TEST);
  
          GLES20.glScissor(startX, startY, 1280 / 4, 720 / 2);
  
          GLES20.glClearColor(TEST_R1 / 255.0f, TEST_G1 / 255.0f, TEST_B1 / 255.0f, 1.0f);
  
          GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
  
          GLES20.glDisable(GLES20.GL_SCISSOR_TEST);
  
      }
  
      private static long computePresentationTimeNsec(int frameIndex, int frameRate) {
  
          final long ONE_BILLION = 1000000000;
  
          return frameIndex * ONE_BILLION / frameRate;
  
      }
  
  
  
      /**
  
       * Holds state associated with a Surface used for MediaCodec encoder input.
  
       * <p>
  
       * The constructor takes a Surface obtained from MediaCodec.createInputSurface(), and uses that
  
       * to create an EGL window surface.  Calls to eglSwapBuffers() cause a frame of data to be sent
  
       * to the video encoder.
  
       * </p><p>
  
       * This object owns the Surface -- releasing this will release the Surface too.
  
       */
  
      private static class CodecInputSurface {
  
          private static final int EGL_RECORDABLE_ANDROID = 0x3142;
  
  
  
          private EGLDisplay mEGLDisplay = EGL14.EGL_NO_DISPLAY;
  
          private EGLContext mEGLContext = EGL14.EGL_NO_CONTEXT;
  
          private EGLSurface mEGLSurface = EGL14.EGL_NO_SURFACE;
  
  
  
          private Surface mSurface;
  
  
  
          /**
  
           * Creates a CodecInputSurface from a Surface.
  
           */
  
          public CodecInputSurface(Surface surface) {
  
              if (surface == null) {
  
                  throw new NullPointerException();
  
              }
  
              mSurface = surface;
  
  
  
              eglSetup();
  
          }
  
  
  
          /**
  
           * Prepares EGL.  We want a GLES 2.0 context and a surface that supports recording.
  
           */
  
          private void eglSetup() {
  
              mEGLDisplay = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
  
              if (mEGLDisplay == EGL14.EGL_NO_DISPLAY) {
  
                  throw new RuntimeException("unable to get EGL14 display");
  
              }
  
              int[] version = new int[2];
  
              if (!EGL14.eglInitialize(mEGLDisplay, version, 0, version, 1)) {
  
                  throw new RuntimeException("unable to initialize EGL14");
  
              }
  
  
  
              // Configure EGL for recording and OpenGL ES 2.0.
  
              int[] attribList = {
  
                      EGL14.EGL_RED_SIZE, 8,
  
                      EGL14.EGL_GREEN_SIZE, 8,
  
                      EGL14.EGL_BLUE_SIZE, 8,
  
                      EGL14.EGL_ALPHA_SIZE, 8,
  
                      EGL14.EGL_RENDERABLE_TYPE, EGL14.EGL_OPENGL_ES2_BIT,
  
                      EGL_RECORDABLE_ANDROID, 1,
  
                      EGL14.EGL_NONE
  
              };
  
              EGLConfig[] configs = new EGLConfig[1];
  
              int[] numConfigs = new int[1];
  
              EGL14.eglChooseConfig(mEGLDisplay, attribList, 0, configs, 0, configs.length,
  
                      numConfigs, 0);
  
              checkEglError("eglCreateContext RGB888+recordable ES2");
  
  
  
              // Configure context for OpenGL ES 2.0.
  
              int[] attrib_list = {
  
                      EGL14.EGL_CONTEXT_CLIENT_VERSION, 2,
  
                      EGL14.EGL_NONE
  
              };
  
              mEGLContext = EGL14.eglCreateContext(mEGLDisplay, configs[0], EGL14.EGL_NO_CONTEXT,
  
                      attrib_list, 0);
  
              checkEglError("eglCreateContext");
  
  
  
              // Create a window surface, and attach it to the Surface we received.
  
              int[] surfaceAttribs = {
  
                      EGL14.EGL_NONE
  
              };
  
              mEGLSurface = EGL14.eglCreateWindowSurface(mEGLDisplay, configs[0], mSurface,
  
                      surfaceAttribs, 0);
  
              checkEglError("eglCreateWindowSurface");
  
          }
  
  
  
          /**
  
           * Discards all resources held by this class, notably the EGL context.  Also releases the
  
           * Surface that was passed to our constructor.
  
           */
  
          public void release() {
  
              if (mEGLDisplay != EGL14.EGL_NO_DISPLAY) {
  
                  EGL14.eglMakeCurrent(mEGLDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE,
  
                          EGL14.EGL_NO_CONTEXT);
  
                  EGL14.eglDestroySurface(mEGLDisplay, mEGLSurface);
  
                  EGL14.eglDestroyContext(mEGLDisplay, mEGLContext);
  
                  EGL14.eglReleaseThread();
  
                  EGL14.eglTerminate(mEGLDisplay);
  
              }
  
  
  
              mSurface.release();
  
  
  
              mEGLDisplay = EGL14.EGL_NO_DISPLAY;
  
              mEGLContext = EGL14.EGL_NO_CONTEXT;
  
              mEGLSurface = EGL14.EGL_NO_SURFACE;
  
  
  
              mSurface = null;
  
          }
  
  
  
          /**
  
           * Makes our EGL context and surface current.
  
           */
  
          public void makeCurrent() {
  
              EGL14.eglMakeCurrent(mEGLDisplay, mEGLSurface, mEGLSurface, mEGLContext);
  
              checkEglError("eglMakeCurrent");
  
          }
  
  
  
          /**
  
           * Calls eglSwapBuffers.  Use this to "publish" the current frame.
  
           */
  
          public boolean swapBuffers() {
  
              boolean result = EGL14.eglSwapBuffers(mEGLDisplay, mEGLSurface);
  
              checkEglError("eglSwapBuffers");
  
              return result;
  
          }
  
  
  
          /**
  
           * Sends the presentation time stamp to EGL.  Time is expressed in nanoseconds.
  
           */
  
          public void setPresentationTime(long nsecs) {
  
              EGLExt.eglPresentationTimeANDROID(mEGLDisplay, mEGLSurface, nsecs);
  
              checkEglError("eglPresentationTimeANDROID");
  
          }
  
  
  
          /**
  
           * Checks for EGL errors.  Throws an exception if one is found.
  
           */
  
          private void checkEglError(String msg) {
  
              int error;
  
              if ((error = EGL14.eglGetError()) != EGL14.EGL_SUCCESS) {
  
                  throw new RuntimeException(msg + ": EGL error: 0x" + Integer.toHexString(error));
  
              }
  
          }
  
      }
  
  }
  
  </p>

  However, the file produced from this code does not play with VLC or ffplay. Can anyone tell me what I’m doing wrong ? I believe it is due to an incorrect format (or total lack) of headers required for the playing of raw h264, as I have had success playing .264 files downloaded from the internet with ffplay. Also, I’m not sure exactly how I’m going to stream this video to a computer, so if somebody could give me some suggestions as to how I might do that, I would be very grateful ! Thanks !

• ffmpeg seeking to I-frame

  7 octobre 2014, par user3398748

  Is it possible to seek to a I-Frame using the av_seek_frame() function.
  The problem I am facing is that if I seek in a AVC file I get a lot of noise if I dont flush the buffer. And if I flush the buffer the decoder dose not return a frame until it comes across a I-Frame which causes problem in the calculation of total frames at the end of file if I am seeking.

  Thank you

• ffmpeg-php to create thumbnail of video

  8 novembre 2014, par Wazzzy

  I am trying to use this script to create thumbnail of a video using ffmpeg. At first I used phpinfo(); and I found ffmpeg is installed on my server.

  Then I copied ffmpeg-php onto my server and run the test file

  I got to know that many function are working on my server

  I got output like this

  Output :-

  Functions available in /usr/lib/php/extensions/no-debug-non-zts-20060613/ffmpeg.so extension:
  
  
  
  Methods available in class ffmpeg_movie:
  
  __construct
  
  getduration
  
  getframecount
  
  getframerate
  
  getfilename
  
  getcomment
  
  gettitle
  
  getauthor
  
  getartist
  
  getcopyright
  
  getalbum
  
  getgenre
  
  getyear
  
  gettracknumber
  
  getframewidth
  
  getframeheight
  
  getframenumber
  
  getpixelformat
  
  getbitrate
  
  hasaudio
  
  hasvideo
  
  getnextkeyframe
  
  getframe
  
  getvideocodec
  
  getaudiocodec
  
  getvideostreamid
  
  getaudiostreamid
  
  getaudiochannels
  
  getaudiosamplerate
  
  getaudiobitrate
  
  getvideobitrate
  
  getpixelaspectratio
  
  getpixelaspectratio
  
  getvideobitrate
  
  getaudiobitrate
  
  getaudiosamplerate
  
  getaudiochannels
  
  getaudiostreamid
  
  getvideostreamid
  
  getaudiocodec
  
  getvideocodec
  
  getframe
  
  getnextkeyframe
  
  hasvideo
  
  hasaudio
  
  getbitrate
  
  getpixelformat
  
  getframenumber
  
  getframeheight
  
  getframewidth
  
  gettracknumber
  
  getyear
  
  getgenre
  
  getalbum
  
  getcopyright
  
  getartist
  
  getauthor
  
  gettitle
  
  getcomment
  
  getfilename
  
  getframerate
  
  getframecount
  
  getduration
  
  __construct

  I wrote this code and tried any possible path to assign $ffmpeg;

  <?php
  
  
  
      $thumb_stdout;
  
      $retval=0;
  
      $ffmpeg = '/home/lib/ffmpeg';
  
  
  
  // change "demo.mpg" to your mpg file name!
  
  $video  = dirname(__FILE__) . 'demo.mpg';
  
  
  
  // change "demo.jpg" to whichever name you like or don't
  
  // for this example, the name of the output jpg file does not matter
  
  $image  = dirname(__FILE__) . 'demo.jpg';
  
  
  
  $second = 1;
  
  
  
  $cmd = "$ffmpeg -i $video 2>&1";
  
  if (preg_match('/Duration: ((\d+):(\d+):(\d+))/s', '$cmd', $time)) {
  
      $total = ($time[2] * 3600) + ($time[3] * 60) + $time[4];
  
      $second = rand(1, ($total - 1));
  
  }
  
  
  
  //$cmd = "$ffmpeg -i $video -deinterlace -an -ss $second -t 00:00:01 -r 1 -y -vcodec mjpeg -f mjpeg $image 2>&1";
  
  $cmd = "$ffmpeg -i $video -r 1 -ss 00:00:05 -t 00:00:01 -s 250x250 -f image2 $image";
  
  echo $cmd;
  
  exec($cmd);
  
  //$return = '$cmd';
  
  
  
  echo '<br />done!';
  
  ?>