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• Flutter : FFmpeg Not Executing Filter

  5 novembre 2022, par Dennis Ashford

  I am downloading a video from Firebase and then trying to apply a watermark to that video that will then be saved in a temporary directory in the cache. I am using the ffmpeg_kit_flutter package to do this. There is very little online about how this should work in Flutter.

  


  The video and image are loaded and stored in the cache properly. However, the FFmpegKit.execute call is not working and does not create a new output file in the cache. Any suggestions on how to make that function execute ? Are the FFmpeg commands correct ?

  


  Future<string> waterMarkVideo(String videoPath, String watermarkPath) async {&#xA;    //these calls are to load the video into temporary directory&#xA;    final response = await http.get(Uri.parse(videoPath));&#xA;    final originalVideo = File (&#x27;${(await getTemporaryDirectory()).path}/video.mp4&#x27;);&#xA;    await originalVideo.create(recursive: true);&#xA;    await originalVideo.writeAsBytes(response.bodyBytes);&#xA;    print(&#x27;video path&#x27; &#x2B; originalVideo.path);&#xA;&#xA;    //this grabs the watermark image from assets and decodes it&#xA;    final byteData = await rootBundle.load(watermarkPath);&#xA;    final watermark = File(&#x27;${(await getTemporaryDirectory()).path}/image.png&#x27;);&#xA;    await watermark.create(recursive: true);&#xA;    await watermark.writeAsBytes(byteData.buffer.asUint8List(byteData.offsetInBytes, byteData.lengthInBytes));&#xA;    print(&#x27;watermark path&#x27; &#x2B; watermark.path);&#xA;&#xA;    //this creates temporary directory for new watermarked video&#xA;    var tempDir = await getTemporaryDirectory();&#xA;    final newVideoPath = &#x27;${tempDir.path}/${DateTime.now().microsecondsSinceEpoch}result.mp4&#x27;;&#xA;&#xA;    //and now attempting to work with ffmpeg package to overlay watermark on video&#xA;    await FFmpegKit.execute("-i $originalVideo -i $watermark -filter_complex &#x27;overlay[out]&#x27; -map &#x27;[out]&#x27; $newVideoPath")&#xA;    .then((rc) => print(&#x27;FFmpeg process exited with rc $rc&#x27;));&#xA;    print(&#x27;new video path&#x27; &#x2B; newVideoPath);&#xA;&#xA;return newVideoPath;&#xA;  }&#xA;</string>

  


  The logs give the file paths and also give this

  


  FFmpegKitFlutterPlugin 0x600000000fe0 started listening to events on 0x600001a4b280.
flutter: Loaded ffmpeg-kit-flutter-ios-https-x86_64-4.5.1.
flutter: FFmpeg process exited with rc Instance of 'FFmpegSession'


  


• Xuggler can't open IContainer of icecast server [Webm live video stream]

  9 juin 2016, par Roy Bean

  I’m trying to stream a live webm stream.

  I tested some server and Icecast is my pic.

  With ffmpeg capturing from an IP camera and publishing in icecast server I’m able to see video in html5

  using this command :

  ffmpeg.exe -rtsp_transport tcp -i "rtsp ://192.168.230.121/profile ?token=media_profile1&SessionTimeout=60" -f webm -r 20 -c:v libvpx -b:v 3M -s 300x200 -acodec none -content_type video/webm -crf 63 -g 0 icecast ://source:hackme@192.168.0.146:8001/test

  I’m using java and tryed to make this with xuggler, but I’m getting an error when opening the stream

   final String urlOut = "icecast://source:hackme@192.168.0.146:8001/agora.webm";
  
      final IContainer    outContainer = IContainer.make();
  
  
  
      final IContainerFormat outContainerFormat = IContainerFormat.make();
  
      outContainerFormat.setOutputFormat("webm", urlOut, "video/webm");
  
  
  
      int rc = outContainer.open(urlOut, IContainer.Type.WRITE, outContainerFormat);
  
  
  
      if(rc>=0) {
  
      }else  {
  
          Logger.getLogger(WebmPublisher.class.getName()).log(Level.INFO, "Fail to open Container " + IError.make(rc));
  
      }

  Any help ?
  I’m getting the error -2 :
  Error : could not open file (../../../../../../../csrc/com/xuggle/xuggler/Container.cpp:544)

  It’s is also very importatn to set the content type as video/webm because icecast by default set the mime type to audio/mpeg

• ffmpeg create thumbnail image of multiple images from video

  21 janvier 2018, par Michael Yousef

  So I want to create a thumbnail image that consists of multiple images from a single video. I’m looking to make them 4x8, and I want to spread out the images uniformly throughout the video.

  Ideally the final product should show 32 image captures, all downscaled to a reasonable size so they can fit on screen at the same time. Also, I’d like to have the final product have some overhead text like the video title, and I’d like to put the timestamp in the images as well.

  

  This is an example of what I want to do. The text at the top and the timestamp in the images. This one’s 6x4 and I want 4x8 but other than that it looks about what I want.

  I think ffmpeg probably has something to do this but I can’t seem to figure it out. I can generate individual screens but not collapse them into one. It’s also slower than programs I’ve used to do this in the past, not sure how they can do it as fast as they do. If I can’t get ffmpeg to do this, I’m open to using Python to accomplish this.