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• ffmpeg image conversion works for nokia conformation heic files but not iphone heic images

  2 novembre 2020, par user12879350

  Below ffmpeg image conversion works for nokia conformation heic files but not iphone heic images

  



  ffmpeg -i c001.heic -c:v mjpeg -frames:v 1 -pix_fmt rgb48 outs.jpg 
(works for nokia conformation files https://github.com/nokiatech/heif_conformance/tree/master/conformance_files 
but not iphone images )

  



  For iphone images ,it throws the below exception
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000021bcaba9980] moov atom not found
image4.heic : Invalid data found when processing input

  



  Is there anything I'm missing

  


• FFMPEG : MP4 videos are not playing properly in iPhone, iPod, iPad

  26 janvier 2020, par Shakti Singh

  I am converting videos from m4v, flv to MP4 for iPhone, iPod, iPad.

  I am using the below command to convert these videos

  ffmpeg -y -i video_1336500693.m4v -vcodec libx264 -vpre slow -vpre
  ipod640 -b 250k -bt 50k -acodec libfaac -ab 56k -ac 2 -s 480x320
  video_1336500693.mp4

  The video part of this mp4 file is working fine but the audio is not working properly. I am using HTML5 for this.

  The audio works for first 8-10 seconds but after that audio does not work and the strange thing is if I jump to forward or backward the audio works.

  Can anyone suggest what’s going wrong ?

• ffmpeg can't read png data on iphone

  10 octobre 2014, par user2789801

  I’m using ffmpeg to decode a png picture and use the AVFrame as a opengl texture.
  But the strangest thing is that I can get the png converted to opengl texture nicely on a iphone simulator, but I got a blank texture on a real iphone.

  on both simulator and iphone, I got a null pointer for AVFrame’s data

  avcodec_decode_video2(codecContext/* AVCodecContext* */,frame /* AVFrame */,&finished,&tempPacket); 

  Then I covert the color space to AV_PIX_FMT_RGBA

  void convertToRGBColor()
  
  {
  
      int numBytes = avpicture_get_size(
  
                                    AV_PIX_FMT_RGBA,
  
                                    codecContext->width,
  
                                    codecContext->height);
  
      uint8_t *buffer = (uint8_t *)av_malloc(numBytes);
  
      avpicture_fill(rgbFrame/* AVFrame* */, buffer, AV_PIX_FMT_RGBA, codecContext->width, codecContext->height);
  
  
  
      struct SwsContext *img_convert_ctx = NULL;
  
      img_convert_ctx = sws_getCachedContext(
  
                           img_convert_ctx,
  
                           codecContext->width,
  
                           codecContext->height,
  
                           codecContext->pix_fmt,
  
                           codecContext->width,
  
                           codecContext->height,
  
                           COLOR_SPACE,
  
                           SWS_BILINEAR,
  
                           NULL,
  
                           NULL,
  
                           NULL);
  
  
  
      if( !img_convert_ctx )
  
      {
  
          fprintf(stderr, "Cannot initialize sws conversion context\n");
  
      }
  
  
  
      sws_scale(img_convert_ctx,
  
                frame->data,
  
                frame->linesize,
  
                0,
  
                codecContext->height,
  
                rgbFrame->data,
  
                rgbFrame->linesize);
  
      sws_freeContext(img_convert_ctx);
  
  }

  On a simulator, rgbFrame’s data[0] will be a valid pointer, but on a iphone, it’s null.

  So, does anyone had the same problem before ?