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• How to detect Audio or Video or Both exist in converted file

  28 juillet 2016, par Khaja Hussain

  I am trying to convert mp4 or 3gp video files into Flash (flv) format (using Perl script), using following (mencoder) command :

  mencoder test.mp4 -of lavf -ovc lavc -lavcopts vcodec=flv:vbitrate=1000:mbd=2 -fps 20.80 -ofps 20.80 -oac mp3lame -lameopts abr:br=32 -srate 22050 -o test.flv

  It works fine, but some files which comes as attachments from mobile phone has problem, the converted FLV file has only audio.

  I also used ffmpeg command as follows :

  ffmpeg -i test.mp4 -ar 22050 -acodec libmp3lame -ab 32K -r 25 -vcodec flv test.flv

  This ffmpeg command helps to convert to flv, which is failed by mencoder.

  I am thinking some solution like, need to check whether converted flv has audio and video then will take action depends on it. Could you help me to solve this issue ?

  Here is some more info (log) :

  [mov,mp4,m4a,3gp,3g2,mj2 @ 0xb6b9a3a0]multiple edit list entries, a/v desync might occur, patch welcome
  ** MUXER_LAVF *************************************
  REMEMBER : MEncoder’s libavformat muxing is presently broken and can generate
  INCORRECT files in the presence of B-frames. Moreover, due to bugs MPlayer
  will play these INCORRECT files as if nothing were wrong !

  ---

  Unsupported PixelFormat 61
  Unsupported PixelFormat 53
  Unsupported PixelFormat 81
  [flv @ 0xb6b9a3a0]Codec for stream 0 does not use global headers but container format requires global headers
  [flv @ 0xb6b9a3a0]Codec for stream 1 does not use global headers but container format requires global headers
  [flv @ 0xb6b9a3a0]pts < dts in stream 0
  Error while writing frame.

  [flv @ 0xb6b9a3a0]pts < dts in stream 0
  Error while writing frame.

  [flv @ 0xb6b9a3a0]pts < dts in stream 0
  Error while writing frame.

  [flv @ 0xb6b9a3a0]pts < dts in stream 0
  Error while writing frame.

  [flv @ 0xb6b9a3a0]pts < dts in stream 0
  Error while writing frame.

  Skipping frame !

  .........................

• How to stream RTMP to Azure Media Services ?

  26 octobre 2020, par Abbas

  I'm trying to stream my camera to Azure Media Services LiveEvent. I'm using Media Services' REST-API to obtain the ingest URL, however the docs don't mention how to stream RTMP from an Android Phone.

  &#xA;

  So far I've tried quiet a few Android RTMP publishing libraries available on Git but each one of them fails at establishing a connection. The list of libraries I've tried so far :

  &#xA;

  &#xA;
  • https://github.com/TakuSemba/RtmpPublisher (Fails internally NDK while opening a connection)

  &#xA;

  • https://github.com/pedroSG94/rtmp-rtsp-stream-client-java (Fails while expecting to receive a header from the ingest URL)

  &#xA;

  • And several others all exhibiting one of the two above mentioned behaviors.

  &#xA;

  &#xA;

  I've also tried streaming from an mp4 video file using ffmpeg inspired from this SO Answer :

  &#xA;

  ffmpeg -re -i video.mp4 -vcodec libx264 -profile:v main -preset:v medium -r 30 -g 60 -keyint_min 60 -sc_threshold 0 -b:v 2500k -maxrate 2500k -bufsize 2500k -filter:v scale="trunc(oha/2)2:720" -sws_flags lanczos+accurate_rnd -acodec aac -b:a 96k -ar 48000 -ac 2 -f flv rtmp://


  &#xA;

  But I'm getting :

  &#xA;

  rtmp://: I/O error


  &#xA;

  Am I missing something ?

  &#xA;

  Is it even at all possible to stream to an ingest URL without a middle tier as suggested by many Azure people is the way to go ?

  &#xA;

  Edit : I've successfully streamed to YouTube Live Streaming using two RTMP libraries and so I'm now pretty sure the issue is not with the RTMP streaming libraries but with how the Azure Live Streaming works. I'm definitely missing a step here.

  &#xA;

• Webm video files recorded on Chrome Mobile cannot be converted to MP4

  7 juillet 2022, par Tobias Kristensen

  I have a website where I record the user's webcam via the MediaRecorder API.&#xA;The video stream is created with navigator.mediaDevices.getUserMedia() :

  &#xA;

  // Create stream
const cameraStream = await navigator.mediaDevices.getUserMedia({ video: 
  { 
    aspectRatio: 1/1, 
    facingMode: 'user',
    width: { min: 360, ideal: 720, max: 1080 },
    height: { min: 360, ideal: 720, max: 1080 },
    deviceId: undefined
  }  
});

// Add stream to videoElement to display a video preview
videoElement.srcObject = cameraStream; 


  &#xA;

  I then check which mime types are available in the browser and use that info to initialize the MediaRecorder :

  &#xA;

  const validMimeTypes = [
  "video/webm\;codecs=vp8",
  "video/webm\;codecs=daala",
  "video/webm\;codecs=h264",
  "video/webm",
  "video/mpeg"
];

const getFirstAvailableMimeType = () => {
  for (const mimeType of validMimeTypes) {
    if (MediaRecorder.isTypeSupported(mimeType)) {
      return mimeType;
    }
  }
}

// Initialize Media Recorder
const mediaRecorder = new MediaRecorder(cameraStream, {
  mimeType: getFirstAvailableMimeType(),
});


  &#xA;

  After I finish recording a video, I upload it to a server and store it on Firebase Storage, so it can be downloaded later.

  &#xA;

  After downloading a video, I would like to convert it to an MP4 file. I've tried using CloudConvert and HandBrake. Both services have no issues converting videos that were recorded via Chrome on my desktop, but both fail when I try to convert videos recorded via Chrome Mobile on my phone.

  &#xA;

  When trying to convert the video to MP4 via CloudConvert, the following error is shown :

  &#xA;

  EBML header parsing failed. /input/import1/69fcceaccc27a0d6eabcb8a65045e87e.webm Invalid data found when processing input


  &#xA;

  Any ideas how I can resolve this issue ?

  &#xA;