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• iPhone slow motion video transcode

  28 septembre 2019, par coverboy

  I’m developing upload video (taken from iPhone) to my server.

  However, I have no idea how to implement.

  Any source code objective-c or swift will be welcomed.

  I have 120fps or 240fps video (It’s a slo-mo).
  When I playback these video on my iPhone6. I can see slo-mo effect.
  (I know playback frame rate is 30fps.)

  I want to convert that video before upload to my server, from 120/240 fps to 30fps video. (I mean not adjusting playback frame rate, it means video transcode to 30fps.)
  Additionally, I want to check slo-mo effect start-point and end-point.
  (Maybe iPhone record this information to video binary(it might be reside in file’s header.)

  Well, I guess if I use ffmpeg library, it should be easy(?).

  So any suggestions will be welcomed.

• ffmpeg audio and the iphone

  17 juin 2019, par michelle

  has anyone been able to make ffmpeg work with audio queues, I get an error when I try to create the queue.

  ret = avcodec_open(enc, codec);
  
  
  
  if (ret < 0) {
  
      NSLog(@"Error: Could not open video decoder: %d", ret); 
  
      av_close_input_file(avfContext); 
  
      return; 
  
  }
  
  
  
  
  
  if (audio_index >= 0) { 
  
      AudioStreamBasicDescription
  
      audioFormat;
  
  
  
      audioFormat.mFormatID = -1;
  
  
  
      audioFormat.mSampleRate =
  
      avfContext->streams[audio_index]->codec->sample_rate;
  
  
  
      audioFormat.mFormatFlags = 0;
  
  
  
      switch (avfContext->streams[audio_index]->codec->codec_id)
  
      {
  
      case CODEC_ID_MP3: 
  
          audioFormat.mFormatID = kAudioFormatMPEGLayer3; 
  
          break;
  
  
  
      case CODEC_ID_AAC: 
  
          audioFormat.mFormatID = kAudioFormatMPEG4AAC;
  
          audioFormat.mFormatFlags = kMPEG4Object_AAC_Main;
  
          break;
  
  
  
      case CODEC_ID_AC3:
  
          audioFormat.mFormatID = kAudioFormatAC3; 
  
          break; 
  
      default: 
  
          break; 
  
      }
  
  
  
      if (audioFormat.mFormatID != -1) { 
  
          audioFormat.mBytesPerPacket = 0; 
  
          audioFormat.mFramesPerPacket =
  
          avfContext->streams[audio_index]->codec->frame_size;
  
  
  
          audioFormat.mBytesPerFrame = 0;
  
  
  
          audioFormat.mChannelsPerFrame = avfContext->streams[audio_index]->codec->channels;
  
  
  
          audioFormat.mBitsPerChannel = 0;
  
  
  
          if (ret = AudioQueueNewOutput(&audioFormat, audioQueueOutputCallback, self, NULL, NULL, 0, &audioQueue)) {
  
  
  
              NSLog(@"Error creating audio output queue: %d", ret);
  
          }

  The issues only with the audio,

  Video is perfect if only I can figure out how to get audio queues to work.

  http://web.me.com/cannonwc/Site/Photos_6.html

  I though of remoteio but there is’nt much doc on that.

  I will share the code for the complete class with anyone that helps me get it to work.

  The idea is to have a single view controller that plays any streaming video passed to it, similar to ffplay on the iphone but without the sdl overhead.

• Recorded & uploaded video from iphone device won't play in iphone

  11 juin 2019, par Sohil Chamadia

  I am facing an issue regarding :

  Recording video from iphone and uploading that video on my application(Develop in Wordpress Framework) then the video uploaded won’t play in iphone devices.

  This issue occurs only when I "Record video from iphone and then uploading that video into the application".If I upload existing video from iphone device then video will be played and it’s working fine. So please help to resolve this issue.I have used "FFmpeg library" to reduce the size of video.

  Below is the code which i have used to play video :

  <video preload="auto" width="320" height="240" controls=""><source src="abc.mp4" type="video/mp4">Your browser does not support the video tag.</source></video>

  When i click on video to play it then video is not play and cross sign is shown over the play button.Below i have attached screenshot of it :