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• Bash - Not able to replace the variable in ffmpeg subtitle

  20 juin 2017, par Steven Foong

  I have 175 mp4 video files and subtitle file with extension ass. Unfortunately my smart TV not able to read the subtitle title. I plan to burn (hardcode) the subtitle into the video.

  I use this command

  ffmpeg -i orgvideo.mp4 -vf subtitles="subtitle.ass" newvideo.mp4

  it work. So I plan to use bash shell script to automate the process.

  Everything is the script is working , but the ffmpeg command line wouldn’t able to retrieve the subtitle variable.

  After google around, I found that my file name has special character and space, that cause my script not working. If the video file name and the subtitle file is simple, then the script should be no problem.

  This is my script.

  for f in *.mp4
  
  do
  
  new="${f%%.mp4} (CHT).mp4"
  
  subtitle="${f%%.mp4}.chi.ass"
  
  < /dev/null ffmpeg -i "$f" -vf subtitles="$subtitle" "$new"
  
  done

  The ffmpeg having problem reading the subtitle file variable. Anyone can help ?

• How to convert n numbers of images into a video slideshow with putting some transition on each images with flutter_ffmpeg ?

  26 avril 2023, par Shruti Ramnandan Sharma

  I'm trying to convert images into a video slideshow with some transition. I have used flutter_ffmpeg plugin , with this plugin I have created with only 3 images but I want to add n numbers of images but couldn't able to find solutions for it. I tried to add more images but it throws error.

  


  I'm gonna add some piece of code below :

  


  

  1. Instance of FlutterFFmpeg

  


  


    final FlutterFFmpeg _flutterFFmpeg = FlutterFFmpeg(); 


  


  

  2. Picking multiple images from the gallery and applying command to convert images into a video

  


  


  void mergeImageVideo() async {
    final ImagePicker picker = ImagePicker();
    final images = await picker.pickMultiImage();

    var im1 = images[0].path;

    var im2 = images[1].path;

    var im3 = images[2].path;

   //-shortest
    openLoadingDialog(context, "Creating video");
    generateFilePath("ImageVideoMerge").then((outputFile) {
      var backgroundColor = 'FFF44336';

      String ffmpegCommand = VideoUtil.generateImagesToVideoScript(
          im1, im2, im3, outputFile, 'mpeg4', '', backgroundColor);

      print("ffmpegCommand==> $ffmpegCommand");
      _flutterFFmpeg.execute(ffmpegCommand).then((v) {
        if (v == 0) {
          var file = File(outputFile);
          Navigator.pop(context);
          showSnackBar(context, "Images Added Successfully", Colors.black);
          updateVideoPlayer(file);
        } else {
          Navigator.pop(context);
        }
      }).then((executionId) {
      });
    });
  }



  


  method to get ffmpeg command (images into video with scale transition)

  


  static String generateImagesToVideoScript(
      String image1Path,
      String image2Path,
      String image3Path,
      String videoFilePath,
      String videoCodec,
      String customOptions,
      String backgroundColor
      ) {

    // ignore: prefer_interpolation_to_compose_strings
     return "-hide_banner -y -loop 1 -i '" +
        image1Path +
        "' " +
        "-loop   1 -i \"" +
        image2Path +
        "\" " +
        "-loop 1   -i \"" +
        image3Path +
        "\" " +
        "-filter_complex " +
        "\" " +
        "[0:v]setpts=PTS-STARTPTS,scale=w=640:h=424,setsar=sar=1/1,split=2[stream1out1][stream1out2];" +
        "[1:v]setpts=PTS-STARTPTS,scale=w=640:h=424,setsar=sar=1/1,split=2[stream2out1][stream2out2];" +
        "[2:v]setpts=PTS-STARTPTS,scale=w=640:h=424,setsar=sar=1/1,split=2[stream3out1][stream3out2];" +
        "[stream1out1]pad=width=640:height=427:x=(640-iw)/2:y=(427-ih)/2:color=#$backgroundColor,trim=duration=3,select=lte(n\\,90)[stream1overlaid];" +
        "[stream1out2]pad=width=640:height=427:x=(640-iw)/2:y=(427-ih)/2:color=#$backgroundColor,trim=duration=1,select=lte(n\\,30)[stream1ending];" +
        "[stream2out1]pad=width=640:height=427:x=(640-iw)/2:y=(427-ih)/2:color=#$backgroundColor,trim=duration=2,select=lte(n\\,60)[stream2overlaid];" +
        "[stream2out2]pad=width=640:height=427:x=(640-iw)/2:y=(427-ih)/2:color=#$backgroundColor,trim=duration=1,select=lte(n\\,30),split=2[stream2starting][stream2ending];" +
        "[stream3out1]pad=width=640:height=427:x=(640-iw)/2:y=(427-ih)/2:color=#$backgroundColor,trim=duration=2,select=lte(n\\,60)[stream3overlaid];" +
        "[stream3out2]pad=width=640:height=427:x=(640-iw)/2:y=(427-ih)/2:color=#$backgroundColor,trim=duration=1,select=lte(n\\,30)[stream3starting];" +
        "[stream2starting][stream1ending]blend=all_expr='if(gte(X,(W/2)*T/1)*lte(X,W-(W/2)*T/1),B,A)':shortest=1[stream2blended];" +
        "[stream3starting][stream2ending]blend=all_expr='if(gte(X,(W/2)*T/1)*lte(X,W-(W/2)*T/1),B,A)':shortest=1[stream3blended];" +
        "[stream1overlaid][stream2blended][stream2overlaid][stream3blended][stream3overlaid]concat=n=5:v=1:a=0,scale=w=640:h=424,format=yuv420p[video]\"" +
        " -map [video] -vsync 2 -async 1 " +
        customOptions +
        "-c:v " +
        videoCodec +
        " -r 30 " +
        videoFilePath;
  }



  


• Saving an audio blob into the backend or Azure as an mp3 file using ffmpeg

  2 juin 2021, par Anne

  I have an asp.net webforms, and I am using javascript and navigator.mediaDevices.getUserMedia to record an audio message.
This message has to be loaded into Azure once recorded.

  


  So far, I have :
2 buttons, start and stop to record the audio blob

  


  At the end of the process, I am trying to use ffmpeg to record the blob into a folder in my application, I can then load the file into Azure (I have the code ready for this one).
Or ideally, save directly to Azure.

  


  I have installed ffmpeg in my application using nuget packages (I tried Xabe ffmpeg downloader and Accord video ffmpeg), however ffmpeg is not recognised when I run the function SendData() and I get this error :
Uncaught Error : Module name "ffmpeg" has not been loaded yet for context : _. Use require([])

  


  My questions are :

  


  

  • How can I install ffmpeg in an asp.net wbeform and register it on the page ?

  


  • Is there another way to save an audio blob to Azure ?

  


  • Is it possible to save the audio chunks into a memory stream that I can later upload into Azure ?

  


  


  Thank you for your help

  


  


  


      <code class="echappe-js">&lt;script&gt;&amp;#xA;        navigator.mediaDevices.getUserMedia({ audio: true }).then(stream =&gt; { handlerFunction(stream) })&amp;#xA;&amp;#xA;        record.onclick = e =&gt; {&amp;#xA;            record.disabled = true;&amp;#xA;            stopRecord.disabled = false;&amp;#xA;            audioChunks = [];&amp;#xA;            rec.start();&amp;#xA;        }&amp;#xA;&amp;#xA;        stopRecord.onclick = e =&gt; {&amp;#xA;            record.disabled = false;&amp;#xA;            stop.disabled = true;&amp;#xA;            rec.stop();&amp;#xA;        }&amp;#xA;&amp;#xA;&amp;#xA;        function handlerFunction(stream) {&amp;#xA;            rec = new MediaRecorder(stream);&amp;#xA;            rec.ondataavailable = e =&gt; {audioChunks.push(e.data);&amp;#xA;                if (rec.state == &quot;inactive&quot;) {&amp;#xA;                    let blob = new Blob(audioChunks, { type: &amp;#x27;audio/mpeg-3&amp;#x27; });&amp;#xA;                    recordedAudio.src = URL.createObjectURL(blob);&amp;#xA;                    recordedAudio.controls = true;&amp;#xA;                    sendData(blob)&amp;#xA;                }&amp;#xA;            }&amp;#xA;        }&amp;#xA;&amp;#xA;        function sendData(data) {&amp;#xA;            var ffmepg = require(&quot;ffmpeg&quot;);&amp;#xA;            try {&amp;#xA;                var Path = data;&amp;#xA;                var process = new ffmepg(&quot;Path&quot;);&amp;#xA;                process.then(function (audio) {audio.fnExtractSoundToMP3(&quot;~//AppData//Audio//test.mp3&quot;, function (error, file) {&amp;#xA;                        if (!error)&amp;#xA;                            console.log(&quot;Audio file: &quot; &amp;#x2B; file);&amp;#xA;                    });&amp;#xA;                }, function (err) {&amp;#xA;                    console.log(&quot;Error: &quot; &amp;#x2B; err);&amp;#xA;                });&amp;#xA;            }&amp;#xA;            catch (e) {&amp;#xA;                console.log(&quot;Catch e.code&quot; &amp;#x2B; e.code);&amp;#xA;                console.log(&quot;Catch e.msg&quot; &amp;#x2B; e.msg);&amp;#xA;            }&amp;#xA;        }&amp;#xA;    &lt;/script&gt;&#xA;&#xA;    &lt;script src=&quot;https://code.jquery.com/jquery-2.2.0.min.js&quot;&gt;&lt;/script&gt;&#xA;    &lt;script src=&quot;https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js&quot;&gt;&lt;/script&gt;

  


  &#xA;&#xA;&#xA;    &#xA;    &#xA;    &#xA;    &#xA;    <code class="echappe-js">&lt;script src='http://stackoverflow.com/Scripts/require.js'&gt;&lt;/script&gt;&#xA;&#xA;&#xA;&#xA;    
  Record
  &#xA;
  &#xA;
  Start
  &#xA;
  Stop
  &#xA;
  &#xA;
  &#xA;        &#xA;
  &#xA;&#xA;