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• 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.

• Truly live streaming to Android/iPhone

  4 juillet 2012, par Tsaukpaetra

  I have spent quite a while (past week) trying this to little avail. However, what I want seems completely unheard of. So far, I have reviewed recommendations available through google, which include encoding a static file into multiple static files in different formats, creating a playlist that hosts static files in an m3u8 file (files which get added to the playlist as streaming continues).
  I have also seen ideas involving rtmp, rtsp etc which are completely out of the question because of their incompatibility.
  Ideally, I would have one webpage that would link to the stream (http://server/video.mp4) and/or show it in a webpage (via the video tag). With that in mind, the most likely format would be h264+aac in mp4 container.

  Unfortunately, (and probably because the file has no duration metadata) it does not work. I can use a desktop player (such as VLC) to open the stream and play it, but my iPhone and Android both give their respective "Can't be played" messages.

  I don't think the problem is caused by the devices' ability to stream, for I have made a streaming shoutcast server work just fine (mp3 only).

  Currently, the closest I have become is using the following setup on my win32 machine :

  FFMPEG Command: : ffmpeg -f dshow -i video="Logitech Webcam 200":audio="Microphone (Webcam 200)" -b:v 180k -bt 240k -vcodec libx264 -tune zerolatency -profile:v baseline -preset ultrafast -r 10 -strict -2 -acodec aac -ac 2 -ar 48000 -ab 32k -f flv "udp ://127.0.0.1:1234"

  VLC: : Stream from udp ://127.0.0.1:1234 to http:// :8080/video.mp4 (No Transcoding), basically just to convert the UDP stream into an http-accessible stream.

  Any hints or suggestions would be warmly welcomed !

• Unable to upload video from iPhone with paperclip-ffmpeg in Ruby on Rails

  13 mai 2015, par sank

  When I upload a video from an iPhone, I’m getting the following error :

  Command :: PATH=/usr/bin/:$PATH; file -b --mime '/tmp/6da355e988ec841811d8803dfd5cf44c20150513-8103-b4lkam.MOV'
  
  [paperclip] Content Type Spoof: Filename IMG_2637.MOV (["video/quicktime"]), content type discovered from file command: inode/x-empty. See documentation to allow this combination.
  
  (0.6ms)  ROLLBACK
  
  Completed 400 Bad Request in 58ms (Views: 0.9ms | ActiveRecord: 5.0ms)

  (This works perfectly when I upload the same video from desktop.)

  I used gems "paperclip", "~> 4.1" and "paperclip-ffmpeg".

  In my video model :

  validates_attachment_content_type :student_video, content_type: /\Avideo\/.*\Z/

  also tried out

  validates_attachment_content_type :student_video, :content_type => ['video/x-   
  
  #                                        msvideo', 'video/avi', 'video/quicktime', 'video/3gpp', 'video/x-ms-
  
  #                                        wmv', 'video/mp4', 'flv-application/octet-stream', 'video/x-
  
  #                                        flv', 'video/mpeg', 'video/mpeg4', 'video/x-la-asf', 'video/x-ms-asf']

  But I’m getting the same error.