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• Android and ffmpeg libb - can't build

  15 décembre 2011, par nmnir

  I'm trying to build my native app with ffmpeg. the ndk-build output is

      $ ../../../ndk-build
    Prebuilt       : libffmpeg.so <=
    cp: omitting directory

  /cygdrive/c/android2/android-ndk-r6/samples/native-audio/jni'
  make : * [/cygdrive/c/android2/android-ndk-r6/samples/native-audio/obj/local/armeabi/libffmpeg.so] Error 1

  Here is my Android.mk :

  LOCAL_PATH := $(call my-dir) 
  
  #declare the prebuilt library 
  
  include $(CLEAR_VARS) 
  
  LOCAL_MODULE := ffmpeg-prebuilt 
  
  LOCAL_SRC_FILES := ffmpeg/android/armv7-a/libffmpeg.so 
  
  LOCAL_EXPORT_C_INCLUDES := ffmpeg/android/armv7-a/include 
  
  LOCAL_EXPORT_LDLIBS := ffmpeg/android/armv7-a/libffmpeg.so 
  
  LOCAL_PRELINK_MODULE := true 
  
  include $(PREBUILT_SHARED_LIBRARY) 
  
  
  
  include $(CLEAR_VARS) 
  
  LOCAL_ALLOW_UNDEFINED_SYMBOLS=false 
  
  LOCAL_MODULE := native-audio-jni 
  
  LOCAL_SRC_FILES := native-audio-jni.cpp 
  
  LOCAL_C_INCLUDES := $(LOCAL_PATH)/ffmpeg/android/armv7-a/include 
  
  LOCAL_SHARED_LIBRARY := ffmpeg-prebuilt 
  
  LOCAL_LDLIBS    := -lOpenSLES -landroid -llog -ljnigraphics -lz -lm $(LOCAL_PATH)/ffmpeg/android/armv7-a/libffmpeg.so 
  
  LOCAL_STATIC_LIBRARY := stdc++
  
  include $(BUILD_SHARED_LIBRARY)

• How to encode using the FFMpeg in Android (using H263)

  3 juillet 2012, par Kenny910

  I am trying to follow the sample code on encoding in the ffmpeg document and successfully build a application to encode and generate a mp4 file but I face the following problems :

  1) I am using the H263 for encoding but I can only set the width and height of the AVCodecContext to 176x144, for other case (like 720x480 or 640x480) it will return fail.

  2) I can't play the output mp4 file by using the default Android player, isn't it support H263 mp4 file ? p.s. I can play it by using other player

  3) Is there any sample code on encoding other video frame to make a new video (which mean decode the video and encode it back in different quality setting, also i would like to modify the frame content) ?

  Here is my code, thanks !

  JNIEXPORT jint JNICALL Java_com_ffmpeg_encoder_FFEncoder_nativeEncoder(JNIEnv* env, jobject thiz, jstring filename){
  
  
  
  LOGI("nativeEncoder()");
  
  
  
  avcodec_register_all();
  
  avcodec_init();
  
  av_register_all();
  
  
  
  AVCodec         *codec;
  
  AVCodecContext  *codecCtx;
  
  int             i;
  
  int             out_size;
  
  int             size;
  
  int             x;
  
  int             y;
  
  int             output_buffer_size;
  
  FILE            *file;
  
  AVFrame         *picture;
  
  uint8_t         *output_buffer;
  
  uint8_t         *picture_buffer;
  
  
  
  /* Manual Variables */
  
  int             l;
  
  int             fps = 30;
  
  int             videoLength = 5;
  
  
  
  /* find the H263 video encoder */
  
  codec = avcodec_find_encoder(CODEC_ID_H263);
  
  if (!codec) {
  
      LOGI("avcodec_find_encoder() run fail.");
  
  }
  
  
  
  codecCtx = avcodec_alloc_context();
  
  picture = avcodec_alloc_frame();
  
  
  
  /* put sample parameters */
  
  codecCtx->bit_rate = 400000;
  
  /* resolution must be a multiple of two */
  
  codecCtx->width = 176;
  
  codecCtx->height = 144;
  
  /* frames per second */
  
  codecCtx->time_base = (AVRational){1,fps};
  
  codecCtx->pix_fmt = PIX_FMT_YUV420P;
  
  codecCtx->codec_id = CODEC_ID_H263;
  
  codecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
  
  
  
  /* open it */
  
  if (avcodec_open(codecCtx, codec) < 0) {
  
      LOGI("avcodec_open() run fail.");
  
  }
  
  
  
  const char* mfileName = (*env)->GetStringUTFChars(env, filename, 0);
  
  
  
  file = fopen(mfileName, "wb");
  
  if (!file) {
  
      LOGI("fopen() run fail.");
  
  }
  
  
  
  (*env)->ReleaseStringUTFChars(env, filename, mfileName);
  
  
  
  /* alloc image and output buffer */
  
  output_buffer_size = 100000;
  
  output_buffer = malloc(output_buffer_size);
  
  
  
  size = codecCtx->width * codecCtx->height;
  
  picture_buffer = malloc((size * 3) / 2); /* size for YUV 420 */
  
  
  
  picture->data[0] = picture_buffer;
  
  picture->data[1] = picture->data[0] + size;
  
  picture->data[2] = picture->data[1] + size / 4;
  
  picture->linesize[0] = codecCtx->width;
  
  picture->linesize[1] = codecCtx->width / 2;
  
  picture->linesize[2] = codecCtx->width / 2;
  
  
  
  for(l=0;l/encode 1 second of video
  
      for(i=0;i/prepare a dummy image YCbCr
  
          //Y
  
          for(y=0;yheight;y++) {
  
              for(x=0;xwidth;x++) {
  
                  picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3;
  
              }
  
          }
  
  
  
          //Cb and Cr
  
          for(y=0;yheight/2;y++) {
  
              for(x=0;xwidth/2;x++) {
  
                  picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
  
                  picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
  
              }
  
          }
  
  
  
          //encode the image
  
          out_size = avcodec_encode_video(codecCtx, output_buffer, output_buffer_size, picture);
  
          fwrite(output_buffer, 1, out_size, file);
  
      }
  
  
  
      //get the delayed frames
  
      for(; out_size; i++) {
  
          out_size = avcodec_encode_video(codecCtx, output_buffer, output_buffer_size, NULL);
  
          fwrite(output_buffer, 1, out_size, file);
  
      }
  
  }
  
  
  
  //add sequence end code to have a real mpeg file
  
  output_buffer[0] = 0x00;
  
  output_buffer[1] = 0x00;
  
  output_buffer[2] = 0x01;
  
  output_buffer[3] = 0xb7;
  
  
  
  fwrite(output_buffer, 1, 4, file);
  
  fclose(file);
  
  free(picture_buffer);
  
  free(output_buffer);
  
  avcodec_close(codecCtx);
  
  av_free(codecCtx);
  
  av_free(picture);
  
  
  
  LOGI("finish");
  
  
  
  return 0; }

• Playing m3u8 on Android Froyo using FFmpeg

  8 février 2012, par user1184526

  I need to create an http live streaming client in Android froyo without being dependent on 3rd party applications (e.g Vitamio). I am able to configure and build Bambuser's release of FFmpeg using Android ndk r7. My problem is I don't know how to use it.

  I found sample codes here in stackoverflow and other forums where people are able to play .avi/.mp3 files from a url using av_open_input_file(). My question is, is it the same for m3u8 files ? Or, do i need to use other functions to be able to work around them ? I don't know how to begin.

  Note : I am an android developer. My C programming is a little bit weak.