Recherche avancée

Sur d’autres sites (8763)

• Trying to merge two videos from my photo roll with Flutter ffmpeg without success

  4 avril 2023, par Stéphane de Luca

  My goal is to merge too video I pick from my photo roll.
My code starts as follows :

  


  // videos[0] contains: "content://media/external/video/media/2779"
 final v1 = await videos[0].getMediaUrl();
    if (v1 == null) return;
    final v1Path = await LecleFlutterAbsolutePath.getAbsolutePath(uri: v1);


  


  But printing v1Pathgive a path with jpeg extension :
/data/user/0/com.example.shokaze/cache/OutputFile_1669939088711.jpeg' which I though would have bear mp4` as it is a video.

  


  Why is it so ?

  


  Another question I have is how can I make a relevant path so that the ffmpeg video appears in my roll after its creation ? Should I do the following and provide outputPathto the code ?

  


  The command it executes is :
-i /data/user/0/com.example.shokaze/cache/OutputFile_1669940421875.jpeg -i /data/user/0/com.example.shokaze/cache/OutputFile_1669940428723.jpeg -filter_complex '[0:0][1:0]concat=n=2:v=1:a=0[out]' -map '[out]' /data/user/0/com.example.shokaze/app_flutter/output.mp4

  


  And I get an error :
I/flutter (30190): error 1

  


  My code is as follows :

  


      String output = "content://media/external/video/media/output";
    final outputPath = await LecleFlutterAbsolutePath.getAbsolutePath(uri: output);
    if (outputPath == null) return;


  


  The full code is as follows :

  


  // Makes the final video by merging all videos from the mixing table
  void makeFinalVideo() async {
    if (videos.length < 2) return;

    final v1 = await videos[0].getMediaUrl();
    if (v1 == null) return;
    final v1Path = await LecleFlutterAbsolutePath.getAbsolutePath(uri: v1);
    if (v1Path == null) return;
    //String v1 = "";
    final v2 = await videos[1].getMediaUrl();
    if (v2 == null) return;
    final v2Path = await LecleFlutterAbsolutePath.getAbsolutePath(uri: v2);
    if (v2Path == null) return;
    String output = "content://media/external/video/media/output";
    final outputPath = "";
    // await LecleFlutterAbsolutePath.getAbsolutePath(uri: output);
    // if (outputPath == null) return;

    Video.merge(v1Path, v2Path, outputPath);
  }



class Video {
  /// Merges the video [v1] with [v2] as [output] video located in app doc path
  static void merge(String v1, String v2, String output) async {
    final appDocDir = await getApplicationDocumentsDirectory();

    //final appDir = await syspaths.getApplicationDocumentsDirectory();
    String rawDocumentPath = appDocDir.path;
    final outputPath = '$rawDocumentPath/output.mp4';

    final command =
        '-i $v1 -i $v2 -filter_complex \'[0:0][1:0]concat=n=2:v=1:a=0[out]\' -map \'[out]\' $outputPath';
    //await execute(command);
    try {
      final r = await FFmpegKit.execute(command);

      //.then((rc) => print("FFmpeg process exited with rc $rc"));
      print("Result: $r");
    } catch (e) {
      print("Exception: $e");
    }
  }
}


  


• ffmpeg boxblur filter takes too long

  12 juin 2020, par Prashant_Sarin

  I am using below command to blur a video but it is very slow. Can anyone please help if i can improve the speed somehow.

  



  "ffmpeg -i $inputPath -lavfi [0:v]split=2[original][copy];[copy]scale=ih*16/9:-1,crop=h=iw*9/16,boxblur=luma_radius=50:chroma_radius=25:luma_power=2[blurred];[blurred][original]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2[final] -map [final] -map a:0 -g 2 -preset ultrafast $outputPath -y"


  


• Humble Video take snapshot of given time

  23 mai 2021, par Boldbayar
  


  1. Hello, I'm using https://github.com/artclarke/humble-video to take a thumbnail from a video.
So far I have successfully managed to take a snapshot from a video at start with following method.

     


     private static Path generateThumbnail(final Path videoFile)
     throws InterruptedException, IOException {

 final Demuxer demuxer = Demuxer.make();
 demuxer.open(videoFile.toString(), null, false, true, null, null);

 int streamIndex = -1;
 Decoder videoDecoder = null;
 String rotate = null;
 final int numStreams = demuxer.getNumStreams();
 for (int i = 0; i < numStreams; ++i) {
     final DemuxerStream stream = demuxer.getStream(i);
     final KeyValueBag metaData = stream.getMetaData();
     final Decoder decoder = stream.getDecoder();
     if (decoder != null
             && decoder.getCodecType() == MediaDescriptor.Type.MEDIA_VIDEO) {
         videoDecoder = decoder;
         streamIndex = i;
         rotate = metaData.getValue("rotate", KeyValueBag.Flags.KVB_NONE);
         break;
     }
 }

 if (videoDecoder == null) {
     throw new IOException("Not a valid video file");
 }
 videoDecoder.open(null, null);

 final MediaPicture picture = MediaPicture.make(videoDecoder.getWidth(),
         videoDecoder.getHeight(), videoDecoder.getPixelFormat());

 final MediaPictureConverter converter = MediaPictureConverterFactory
         .createConverter(MediaPictureConverterFactory.HUMBLE_BGR_24, picture);

 final MediaPacket packet = MediaPacket.make();
 BufferedImage image = null;
 MUX : while (demuxer.read(packet) >= 0) {
     if (packet.getStreamIndex() != streamIndex) {
         continue;
     }
     int offset = 0;
     int bytesRead = 0;
     videoDecoder.decodeVideo(picture, packet, offset);
     do {
         bytesRead += videoDecoder.decode(picture, packet, offset);
         if (picture.isComplete()) {
             image = converter.toImage(null, picture);
             break MUX;
         }
         offset += bytesRead;

     } while (offset < packet.getSize());
 }
 if (image == null) {
     throw new IOException("Unable to find a complete video frame");
 }
 if (rotate != null) {
     final AffineTransform transform = new AffineTransform();
     transform.translate(0.5 * image.getHeight(), 0.5 * image.getWidth());
     transform.rotate(Math.toRadians(Double.parseDouble(rotate)));
     transform.translate(-0.5 * image.getWidth(), -0.5 * image.getHeight());
     final AffineTransformOp op = new AffineTransformOp(transform,
             AffineTransformOp.TYPE_BILINEAR);
     image = op.filter(image, null);
 }

 final Path target = videoFile.getParent()
         .resolve(videoFile.getFileName() + ".thumb.jpg");

 final double mul;
 if (image.getWidth() > image.getHeight()) {
     mul = 216 / (double) image.getWidth();
 } else {
     mul = 216 / (double) image.getHeight();
 }

 final int newW = (int) (image.getWidth() * mul);
 final int newH = (int) (image.getHeight() * mul);
 final Image thumbnailImage = image.getScaledInstance(newW, newH,
         Image.SCALE_SMOOTH);
 image = new BufferedImage(newW, newH, BufferedImage.TYPE_INT_BGR);

 final Graphics2D g2d = image.createGraphics();
 g2d.drawImage(thumbnailImage, 0, 0, null);
 g2d.dispose();

 ImageIO.write(image, "jpeg", target.toFile());
 return target.toAbsolutePath(); }


     


  


  2. Now, what I want to do is take a snapshot after 2 seconds after the video starts, is it possible ? I
have tried using the "Demuxer" -s seek method but no luck.