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Sur d’autres sites (11695)

  • How to add a subtitle to a video using ffmpeg in Flutter ?

    3 juillet 2024, par Mohammed Bekele

    I'm using flutter_ffmpeg_kit_full package to add subtitles to my video. First I loop through all words and create an srt file and stored it in temp folder :

    


     Future<string> _createSrtFile() async {&#xA;    String filePath = await getSrtOutputFilePath();&#xA;&#xA;    final file = File(filePath);&#xA;    final buffer = StringBuffer();&#xA;&#xA;    for (int i = 0; i &lt; widget.words.length; i&#x2B;&#x2B;) {&#xA;      final word = widget.words[i];&#xA;      final startTime = _formatSrtTime(word[&#x27;startTime&#x27;].toDouble());&#xA;      final endTime = _formatSrtTime(word[&#x27;endTime&#x27;].toDouble());&#xA;      final text = word[&#x27;word&#x27;];&#xA;&#xA;      buffer.writeln(&#x27;${i &#x2B; 1}&#x27;);&#xA;      buffer.writeln(&#x27;$startTime --> $endTime&#x27;);&#xA;      buffer.writeln(&#x27;$text&#x27;);&#xA;      buffer.writeln(&#x27;&#x27;);&#xA;    }&#xA;&#xA;    await file.writeAsString(buffer.toString());&#xA;    return filePath;&#xA;  }&#xA;&#xA;  String _formatSrtTime(double seconds) {&#xA;    final int hours = seconds ~/ 3600;&#xA;    final int minutes = ((seconds % 3600) ~/ 60);&#xA;    final int secs = (seconds % 60).toInt();&#xA;    final int millis = ((seconds - secs) * 1000).toInt() % 1000;&#xA;&#xA;    return &#x27;${hours.toString().padLeft(2, &#x27;0&#x27;)}:${minutes.toString().padLeft(2, &#x27;0&#x27;)}:${secs.toString().padLeft(2, &#x27;0&#x27;)},${millis.toString().padLeft(3, &#x27;0&#x27;)}&#x27;;&#xA;  }&#xA;</string>

    &#xA;

    Then I create a future function to handle the export by using ffmpeg command :

    &#xA;

    Future<void> _exportVideo() async {&#xA;    final hasPermission = await _requestStoragePermission();&#xA;    if (!hasPermission) {&#xA;      ScaffoldMessenger.of(context).showSnackBar(&#xA;          const SnackBar(content: Text(&#x27;Storage permission denied&#x27;)));&#xA;      return;&#xA;    }&#xA;&#xA;    setState(() {&#xA;      _isProcessing = true;&#xA;      _outputFilePath = "";&#xA;    });&#xA;&#xA;    try {&#xA;      final srtFilePath = await _createSrtFile();&#xA;&#xA;      String videoPath = widget.videoFile!.path;&#xA;&#xA;      String _outputPath = await getOutputFilePath();&#xA;&#xA;      final command =&#xA;          &#x27;-i $videoPath -vf "drawtext="text=\&#x27;Stack Overflow\&#x27;:fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2"" -codec:a copy $_outputPath&#x27;;&#xA;&#xA;      // final cmd = [&#xA;      //   &#x27;-i&#x27;,&#xA;      //   videoPath,&#xA;      //   &#x27;-preset&#x27;,&#xA;      //   &#x27;ultrafast&#x27;,&#xA;      //   &#x27;-vf&#x27;,&#xA;      //   &#x27;subtitles=$srtFilePath:force_style=\&#x27;Fontname=Roboto Bold,FontSize=30,MarginV=70,PrimaryColour=ffffff,OutlineColour=000000\&#x27;&#x27;,&#xA;      //   _outputPath&#xA;      // ];&#xA;      // FFmpegKit.executeWithArguments(cmd)&#xA;&#xA;      print(&#x27;Executing FFmpeg command: $command&#x27;);&#xA;&#xA;      await FFmpegKit.execute(command).then((session) async {&#xA;        final returnCode = await session.getReturnCode();&#xA;        final output = await session.getOutput();&#xA;        final failStackTrace = await session.getFailStackTrace();&#xA;&#xA;        print(&#x27;FFmpeg Output: $output&#x27;);&#xA;        if (failStackTrace != null) {&#xA;          print(&#x27;FFmpeg Fail StackTrace: $failStackTrace&#x27;);&#xA;        }&#xA;&#xA;        if (ReturnCode.isSuccess(returnCode)) {&#xA;          setState(() {&#xA;            _outputFilePath = _outputPath;&#xA;          });&#xA;          ScaffoldMessenger.of(context).showSnackBar(&#xA;              const SnackBar(content: Text(&#x27;Export successful!&#x27;)));&#xA;        } else {&#xA;          final logs = await session.getLogsAsString();&#xA;          print(&#x27;FFmpeg Logs: $logs&#x27;);&#xA;          ScaffoldMessenger.of(context)&#xA;              .showSnackBar(const SnackBar(content: Text(&#x27;Export failed!&#x27;)));&#xA;        }&#xA;      });&#xA;    } catch (e) {&#xA;      print(&#x27;Error: $e&#x27;);&#xA;      ScaffoldMessenger.of(context).showSnackBar(&#xA;          SnackBar(content: Text(&#x27;Export failed with error: $e&#x27;)));&#xA;    } finally {&#xA;      setState(() {&#xA;        _isProcessing = false;&#xA;      });&#xA;    }&#xA;  }&#xA;</void>

    &#xA;

    I did the export without the subtitles and it works. but the issue is when I try to do it with subtitles. I don't know what fault I'm making but this code is failing to export. Here is the path for the srt and video itself :

    &#xA;

      Future<string> getOutputFilePath() async {&#xA;    final Directory? downloadsDir = await getDownloadsDirectory();&#xA;    final timestamp = DateTime.now().millisecondsSinceEpoch;&#xA;    final name = "output-$timestamp.avi";&#xA;    return &#x27;${downloadsDir!.path}/$name&#x27;; // Save in downloads folder&#xA;  }&#xA;&#xA;  Future<string> getSrtOutputFilePath() async {&#xA;    final Directory? downloadsDir = await getDownloadsDirectory();&#xA;    final timestamp = DateTime.now().millisecondsSinceEpoch;&#xA;    final name = "caption-$timestamp.srt";&#xA;    return &#x27;${downloadsDir!.path}/$name&#x27;; // Save in downloads folder&#xA;  }&#xA;</string></string>

    &#xA;

  • How to extract audio from video with ffmpegKit in flutter

    8 juillet 2024, par Carlos Peñaranda

    I want to extract audio from video with this method :

    &#xA;

     Future<audio> extractAudio(Video video, String formatAudioByUser) async {&#xA;   &#xA;    final pathAudio = video.pathIn;&#xA;&#xA;    FFmpegKit.execute(&#xA;            &#x27;-i ${video.pathIn} -q:a 0 -map a audio_${video.title}.mp3&#x27;)&#xA;        .then((session) async {&#xA;      final returnCode = await session.getReturnCode();&#xA;&#xA;      if (ReturnCode.isSuccess(returnCode)) {&#xA;        Fluttertoast.showToast(msg: &#x27;Extraccion exitosa&#x27;);&#xA;      } else if (ReturnCode.isCancel(returnCode)) {&#xA;        Fluttertoast.showToast(msg: &#x27;Extraccion cancelada&#x27;);&#xA;      } else {&#xA;        final error = await session.getFailStackTrace();&#xA;        Fluttertoast.showToast(msg: &#x27;Fallo al extraer audio: $error&#x27;);&#xA;      }&#xA;    });&#xA;&#xA;//creates object&#xA;  final audio = Audio(&#xA;      id: &#x27;audio_${video.id}&#x27;,&#xA;      title: &#x27;audio_${video.title}&#x27;,&#xA;      duration: video.duration,&#xA;      pathIn: video.pathIn, &#xA;      pathOut:pathAudio,&#xA;      format: formatAudioByUser,&#xA;    );&#xA;    &#xA;    return audio;&#xA;  }&#xA;</audio>

    &#xA;

    which i use in my datasource_impl.

    &#xA;

    But when choosing the media (video) and running the method, it doesn't work from the ffmpegkit script, and it shows this error : "Fallo al extraer audio: null"

    &#xA;

    I've reviewed the debugging mode, and created brakpoints, but all the video data looks good.

    &#xA;

  • How to execute this CMD Script in a Batch File ?

    10 août 2024, par Edgar Ferreira

    &#xA;

    I am trying to make a batch file that when executes makes a list named VideosToJoin.txt of the files with the extension .mp4, .mts and .avi in the folder and the after that proceed with the concat of those same files creating a final one named FinalVideo.mp4&#xA;I need some help here, because i want to automatize a specific process...

    &#xA;

    (for %i in (*.mp4,*.mts,*.avi) do @echo file &#x27;%i&#x27;) > VideosToJoin.txt   &#xA;  &#xA;ffmpeg -f concat -i VideosToJoin.txt -c copy FinalVideo.mp4&#xA;

    &#xA;

    The expected result is to have the final video by executing just one file, that's all i want, please help.

    &#xA;