Newest 'ffmpeg' Questions - Stack Overflow

Les articles publiés sur le site

• ffmpeg - how to set max frame rate

  20 février 2017, par user19283043

  I'm using ffmpeg to convert video and I would like to set max framerate. For example, I have a video which is 46 framerate, but I want to set this to 40.

  This is my code below:

  var cmd = ffmpeg()
        .input(data.img_path)
        .format('mp4')
        .videoCodec('libx264')
        .audioBitrate('192k')
        .audioChannels(2)
        .outputOptions('-movflags', 'frag_keyframe')
        ....
  

• Convert ismv to mpeg-dash with node js

  20 février 2017, par MBajor13

  I'm trying stream live video from ip camera to HTML 5 video teg.
  I encoding stream with ffmpeg. The comand is.
  
  $ ffmpeg -rtsp_transport tcp -an -i "rtsp://192.168.1.10:554/user=admin&password=&channel=1&stream=0.sdp" -f mp4 -reset_timestamps 1 -movflags isml+empty_moov+default_base_moof -g 30 -probesize 200000 "http://localhost:1313/mediasourse.isml/stream1"
  
  Then I resive the date in node.js server and send them to users whith WebSocket.
  The issue is that the search bar in video teg remain on the same plase.
  
  I notice that mp4box except "moof" and "mdat" atoms adds "styp" and "sidx" atoms in each segment. "moov" atom is also different. But I don't know what exactly I nead to edite.
  
  Thanks.

• Text on video ffmpeg

  20 février 2017, par Jesper Madsen

  How can I add text overlay on my video in ffmpeg?

  i.e. given a video "video1.flv", how can I add "StackOverflow" text during the whole video, positioned in the middle of the screen, with white text and a border?

• Raw Audio from NAudio

  20 février 2017, par Ken

  I want to record raw audio from WASAPI loopback by NAudio and pipe to FFmpeg for streaming via memory stream. As from this document, FFmpeg can get input as Raw However, I got result speed at 8~10x! Here is my code:

  waveInput = new WasapiLoopbackCapture();
  waveInput.DataAvailable += new EventHandler((object sender, WaveInEventArgs e) => 
  {
      lock (e.Buffer)
      {
          if (waveInput == null)
              return;
          try
          {
              using (System.IO.MemoryStream memoryStream = new System.IO.MemoryStream())
              {
                  memoryStream.Write(e.Buffer, 0, e.Buffer.Length);
                  memoryStream.WriteTo(ffmpeg.StandardInput.BaseStream);
              }
          }
          catch (Exception)
          {
              throw;
          }
      }
  });
  waveInput.StartRecording();
  

  FFmpeg Arguments:

  ffmpegProcess.StartInfo.Arguments = String.Format("-f s16le -i pipe:0 -y output.wav");
  

  1. Can someone please explain this situation and give me a solution?
  2. Should I add Wav header to the Memory Stream then pipe to FFmpeg as Wav format?

  The Working Solution

  waveInput = new WasapiLoopbackCapture();
  waveInput.DataAvailable += new EventHandler((object sender, WaveInEventArgs e) => 
  {
      lock (e.Buffer)
      {
          if (waveInput == null)
              return;
          try
          {
              using (System.IO.MemoryStream memoryStream = new System.IO.MemoryStream())
              {
                  memoryStream.Write(e.Buffer, 0, e.BytesRecorded);
                  memoryStream.WriteTo(ffmpeg.StandardInput.BaseStream);
              }
          }
          catch (Exception)
          {
              throw;
          }
      }
  });
  waveInput.StartRecording();
  

  FFMpeg Arguments:

  ffmpegProcess.StartInfo.Arguments = string.Format("-f f32le -ac 2 -ar 44.1k -i pipe:0 -c:a copy -y output.wav");
  

• best approach for extract / extracting images / image sequence from videos / video file in Java

  20 février 2017, par Daniel Ruf

  Well, there is FFMPEG and some Java bindings and wrappers for it but I need to distribute for each specific platform the right binary file of FFMPEG.

  Isnt there any plain Java solution or library without any dependencies like FFMPEG for converting a video fle to an image sequence?

  Solutions like FFMPEG, XUGGLER or JMF (abandoned) are not suitable. Is there really no pure Java solution for this?

  Maybe for specific video codecs / files at least?

  I just want to extract the images from the video file to jpeg / png files and save them to the disk