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• ffmpeg extract video frames from url to a local variable in Node

  8 octobre 2020, par FireBrand

  I'm using the Nodejs spawn() functionality to execute a shell command that goes like this :

  


  ffmpeg -i https://someUrl.com/someVideo.mp4 -vf fps=30 frame-%d.bmp


  


  Which works for me as to saving 30 frames per second into numbered files, but I'd like to save every frame into a local variable so I could parse it in whatever way I need to (specifically to a JSON).

  


  What would be the best way to do so ?

  


  Thanks in advance.

  


• Image sequence to video stream ?

  22 août 2015, par Hauns TM

  Like many people already seem to have (there are several threads on this subject here) I am looking for ways to create video from a sequence of images.

  I want to implement my functionality in C# !

  Here is what I wan’t to do :

  /*Pseudo code*/
  
  void CreateVideo(List<image> imageSequence, long durationOfEachImageMs, string outputVideoFileName, string outputFormat)
  
  {
  
      // Info: imageSequence.Count will be > 30 000 images
  
      // Info: durationOfEachImageMs will be &lt; 300 ms
  
  
  
      if (outputFormat = "mpeg")
  
      {
  
      }
  
      else if (outputFormat = "avi")
  
      {      
  
      }
  
      else
  
      {
  
      }
  
  
  
      //Save video file do disk
  
  }
  
  </image>

  I know there’s a project called Splicer (http://splicer.codeplex.com/) but I can’t find suitable documentation or clear examples that I can follow (these are the examples that I found).

  The closest I want to do, which I find here on CodePlex is this :
  How can I create a video from a directory of images in C# ?

  I have also read a few threads about ffmpeg (for example this : C# and FFmpeg preferably without shell commands ? and this : convert image sequence using ffmpeg) but I find no one to help me with my problem and I don’t think ffmpeg-command-line-style is the best solution for me (because of the amount of images).

  I believe that I can use the Splicer-project in some way (?).

  In my case, it is about about > 30 000 images where each image should be displayed for about 200 ms (in the videostream that I want to create).

  (What the video is about ? Plants growing ...)

  Can anyone help me complete my function ?

• Android ICS FFMPEG scale video not working

  20 avril 2015, par Android-Developer

  I am using Guardian Project Android Java FFMPEG library to resize videos. Current code which is working on android 5.0.1 / 5.1.0 / 4.4.4 :

      File fileTmp = getCacheDir();
  
      FfmpegController fc = null;
  
      try {
  
          fc = new FfmpegController(this, fileTmp);
  
      } catch (IOException e) {
  
          e.printStackTrace();
  
      }
  
      String path = Environment.getExternalStorageDirectory().getPath() + "/Movies/nexus.mp4";
  
      final String outPath = Environment.getExternalStorageDirectory().getPath() + "/Movies/test.mp4";
  
      final Clip out = new Clip(path);
  
      try {
  
          if (fc != null) {
  
              fc.convert(out, outPath, new ShellUtils.ShellCallback() {
  
                  @Override
  
                  public void shellOut(String shellLine) {
  
                      Log.e("", "SHELL OUT: " + shellLine);
  
                  }
  
  
  
                  @Override
  
                  public void processComplete(int exitValue) {
  
                      Log.e("", "PROCESS COMPLETE: " + exitValue);
  
                  }
  
              });
  
          }
  
      } catch (Exception e) {
  
          e.printStackTrace();
  
      }

  Using this code on Android 4.0.4 (Ice Cream Sandwich) doesn’t do anything. While testing on other devices exitValue in processComplete is always equal to 0, but on ICS it’s 11. Here is the output in LogCat :

  SHELL OUT: /data/data/org.hardartcore.ffmpeg/app_bin/ffmpeg -y -i /mnt/sdcard/Movies/NEXUS.mp4 -ab 160k -r ntsc-film -vf scale=568:320 -strict -2 /mnt/sdcard/Movies/Test.mp4
  
  PROCESS COMPLETE: 11

  I don’t think it’s something from ffmpeg, more like a problem when the library is trying to execute ffmpeg executable from raw folder in internal memory, but I can’t see any logs or errors which indicate that too.

  So my question is, if there is any mistake which I am doing using / running this code or something which can prevent ffmpeg executable from running on old devices with Android ICS ?

  Thanks in advance !