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• ffmpeg - Incompatible sample format '(null)'

  17 juin 2012, par abrahab

  I convert videos from different sources with ffmpeg to mp4 with libx264 codec. After conversation time to time I got incorrect format error when trying to load already converted video with ffmpeg : Incompatible sample format '(null)' for codec 'aac', auto-selecting format 's16'

  Seems, it is audio stream problem with aac codec ? How to fix or how to convert videos to mp4 to be sure that I will not get the following error ? Maybe somehow need to specify audio format at the ffmpeg convert command ?

  ps. Video must work at Iphone/Ipad.
  pps. the main problem, that such videos with the following error can not be pseudo-streamed with nginx (got 500 Error)
  ppps. and sorry for my bad english, please, correct my text if need. thanks.

  Some additional info from file :

    Duration: 00:00:10.30, start: 0.000000, bitrate: 614 kb/s
  
      Stream #0.0(rus): Video: h264 (High), yuv420p, 1024x576, 567 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
      Stream #0.1(rus): Audio: aac, 22050 Hz, stereo, s16, 57 kb/s
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00

• Converting FFmpeg frame to OpenGL ES texture

  10 juillet 2015, par joe

  I’m trying to convert from a video using FFmpeg to an OpenGL ES texture in jni, but all that I get is a black texture. I have output the OpenGL with the glGetError(), but there is no error.

  Here is my code :

  void* pixels;
  
  int err;
  
  int i;
  
  int frameFinished = 0;
  
  AVPacket packet;
  
  static struct SwsContext *img_convert_ctx;
  
  static struct SwsContext *scale_context = NULL;
  
  int64_t seek_target;
  
  
  
   int target_width = 320;
  
   int target_height = 240;
  
   GLenum error = GL_NO_ERROR;
  
   sws_freeContext(img_convert_ctx);  
  
  
  
  i = 0;
  
  while((i==0) && (av_read_frame(pFormatCtx, &packet)>=0)) {
  
          if(packet.stream_index==videoStream) {
  
          avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
  
  
  
          if(frameFinished) {
  
              LOGI("packet pts %llu", packet.pts);
  
              img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, 
  
                     pCodecCtx->pix_fmt, 
  
                     target_width, target_height, PIX_FMT_RGB24, SWS_BICUBIC, 
  
                     NULL, NULL, NULL);
  
              if(img_convert_ctx == NULL) {
  
                  LOGE("could not initialize conversion context\n");
  
                  return;
  
              }
  
                  sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameRGB->data, pFrameRGB->linesize);
  
                  LOGI("sws_scale");
  
  
  
                  videoTextures = new Texture*[1];
  
                  videoTextures[0]->mWidth = 256; //(unsigned)pCodecCtx->width;
  
                  videoTextures[0]->mHeight = 256; //(unsigned)pCodecCtx->height;
  
                  videoTextures[0]->mData = pFrameRGB->data[0];
  
  
  
                  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  
  
  
                  glGenTextures(1, &(videoTextures[0]->mTextureID));
  
                  glBindTexture(GL_TEXTURE_2D, videoTextures[0]->mTextureID);
  
                  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 
  
                  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  
  
  
                  if(0 == got_texture)
  
                  {
  
                      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, videoTextures[0]->mWidth, videoTextures[0]->mHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *)videoTextures[0]->mData);
  
  
  
                      glTexSubImage2D(GL_TEXTURE_2D, 0, 0,0, videoTextures[0]->mWidth, videoTextures[0]->mHeight, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *)videoTextures[0]->mData);
  
                  }else
  
                  {
  
                      glTexSubImage2D(GL_TEXTURE_2D, 0, 0,0, videoTextures[0]->mWidth, videoTextures[0]->mHeight, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *)videoTextures[0]->mData);
  
  
  
                  }
  
  
  
                  i = 1;
  
                  error = glGetError();
  
                  if( error != GL_NO_ERROR ) {
  
                      LOGE("couldn't create texture!!");
  
                         switch (error) {
  
                          case GL_INVALID_ENUM:
  
                          LOGE("GL Error: Enum argument is out of range");
  
                          break;
  
                          case GL_INVALID_VALUE:
  
                              LOGE("GL Error: Numeric value is out of range");
  
                          break;
  
                          case GL_INVALID_OPERATION:
  
                              LOGE("GL Error: Operation illegal in current state");
  
                          break;
  
                          case GL_OUT_OF_MEMORY:
  
                              LOGE("GL Error: Not enough memory to execute command");
  
                          break;
  
                          default:
  
                              break;
  
                         }
  
                  }
  
          }
  
      }
  
      av_free_packet(&packet);
  
  }

  I have succeeded in changing pFrameRGB to a java bitmap， but I just want to change it to a texture in the c code.

  Edit1 I have output the Texture ID, it is 0 ; could texture ID be zero ? I changed my code
  but it always be zero.

  Edit2
  the Texture display, but it is a mess.

• Mixing audio and video with ffmpeg [closed]

  3 septembre 2013, par Narendra DroidWorm

  I am having an mp4 video (without audio), to which I want to add music using ffmpeg, and also want the output video to be of the same length as the input video.

  But, as a result, I am getting an video merged with audio, but consuming a little more time (abt 1-2 seconds) in the start with a black screen.

  I am using the following command for my desired output.

  ffmpeg -i audio.mp3 -i video.avi -acodec copy -vcodec copy output.avi

  Please suggest, what modifications should I do to get my desired output.