Newest 'ffmpeg' Questions - Stack Overflow

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• If you rotate the iPhone's video with ffmpeg, the rotation information sticks. Can I hide this ?

  24 août 2017, par howmanylife

  The following implementation is a command to rotate the movie by 90 degrees.

  ffmpeg -i video.mp4 -vf transpose=1 -metadata:s:v:0 rotate=0 videoo.mp4
  -vf transpose=1
  

  The iPhone's video contains rotation information and actually

  ffprobe -show_streams -print_format json videoo.mp4 2>/dev/null
  

  To output motion picture information or rotation information as described below.

   "tags": {
                  "rotate": "90",
                  "creation_time": "2017-08-24T01:49:38.000000Z",
                  "language": "und",
                  "handler_name": "Core Media Data Handler",
                  "encoder": "'avc1'"
              },
              "side_data_list": [
                  {
                      "side_data_type": "Display Matrix",
                      "displaymatrix": "\n00000000:            0       65536           0\n00000001:       -65536           0           0\n00000002:            0           0  1073741824\n",
                      "rotation": -90
                  }
              ]
  
  
  
  "rotate": "90",
  

  and

  "side_data_list":
  

  and

  "rotation": -90
  

  Is it possible to hide this? Or is it possible to erase only this rotation information?

• How to stop ffmpeg after it has finished python

  24 août 2017, par Joey B

  I have a function that finds an mp4 video in a temp folder, converts it to an mp3 in a seperate folder, called music, and then deletes the mp4 from the temp folder. It looks like such:

  import imageio
  imageio.plugins.ffmpeg.download()
  import moviepy.editor as mp
  
  def convert_mp4_to_mp3():
      video_file = os.listdir(os.getcwd() + '//temp')[0]
      audio_file = video_file.replace('mp4','mp3')
      clip = mp.VideoFileClip(os.getcwd() + '//temp//' + video_file)
      clip.audio.write_audiofile(os.getcwd() + '//music//' + audio_file)
      os.system("taskkill /f /im ffmpeg.win32.exe*32")
      os.remove(os.getcwd() + '//temp//' + video_file)
  

  The function successfully completes the conversion of mp4 to mp3 but when I try and delete the file, I get the following error:

  PermissionError: [WinError 32] The process cannot access the file because it 
  is being used by another process
  

  Upon trying to manually delete the file, I discovered it was because "ffmpeg.win32.exe" is still running with the file open. I could not manually delete it until I killed that process.

  I tried implementing the second to last line (os.system("taskkill /f /im ffmpeg.win32.exe*32") to kill the process but I still come up with the same error.

  So my question is, is there a simple way to kill ffmpeg once I know I am done with it or is there a workaround to somehow kill it via another process? I am working in python3.6 on a windows 7 pc. Thanks in advance for the help!

• frames left in the queue on closing - FFMpeg

  24 août 2017, par Sepehr Norouzi

  Im working with FFmpeg on PHP. First I download audio file with wget on linux.

  Then I start ffmpeg to encode my audio file with new metadata but unfortunately this error displays:

  frames left in the queue on closing 
  

  What's the problem?

• MediaSource through socket stops

  23 août 2017, par Paulo Galdo Sandoval

  i'm trying to stream a rtsp live stream through socket.io using ffmpeg (this works fine), but now i need to get that video from the socket and play it on a HTML5 video tag.

  To do this i'm using MediaSurce, getting small pieces of video through the socket and then appending it to the MediaSource

  This solution reproduces the video a few seconds o minutes and then suddenly stops and it doesn't throw me any error on the Chrome console

      var socket = io();
  
      var ms = new MediaSource();
      var sourceBuffer;
      var queue = [];
      var video = document.getElementById("video");
      video.src = window.URL.createObjectURL(ms);
  
      socket.on('start', function (response) {
          console.log(response);
          socket.emit('streaming', $stateParams.id);
          ms.addEventListener('sourceopen', videoLoad, false);
          ms.addEventListener('sourceclose', videoClosed, false);
      });
  
  
      function videoLoad() {
          sourceBuffer = ms.addSourceBuffer('video/webm; codecs="vorbis,vp8"');
          sourceBuffer.addEventListener('update', function () {
              if (queue.length > 0 && !sourceBuffer.updating) {
                  console.log(queue.length);
                  sourceBuffer.appendBuffer(queue.shift());
              }
          });
  
          socket.on('data', function (response) {
              var bytes = new Uint8Array(response);
              var blob = new Blob(bytes);
              console.log(blob.size);
              if (sourceBuffer.updating || queue.length > 0) {
                  queue.push(bytes);
              } else {
                  sourceBuffer.appendBuffer(bytes);
              }
          });
      }
  
      function videoClosed(e) {
          console.log('mediaSource readyState: ' + this.readyState);
      }
  

  On my chrome://media-internals/ the video players log show me a couple of time this, and then the video stops

  video_buffering_state   BUFFERING_HAVE_ENOUGH
  

• How i can scale a Video using JAVA CV

  23 août 2017, par Aqeel Haider

  I want to scale a video using Java CV. This is the ffmpeg command for scaling a video.

  ffmpeg -i  -s x 
  

  The JavaCV has ffmpegFrameGrabber.java, ffmpegFrameRecorder.java and ffmpegFrameFilter.java, but i don't know how to achieve this command using JavaCV.

  I don't want Java Cli Wrapper, I only want to use JavaCV as the app I'm working on use different OS.

  If you know different approach kindly share with me.