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• Android - 360 video metadata

  11 mai 2017, par Xys

  So with ffmpeg I’ve concatenated two 360 videos into one. The problem is that I lost all the 360 video metadata in the final video (so it’s not recognized as a 360 video anymore). If I use exiftool on the final video, I lack those metadatas :

  • Spherical : true
  • Stitched : true
  • Stitching Software : Spherical Metadata Tool
  • Projection Type : equirectangular

  I’ve tried to inject those metadatas with ffmpeg, like this for example :

  ffmpeg -i  -metadata Spherical="true" -codec copy 

  I don’t get any errors doing that, but exiftool still doesn’t show the metadatas.

  I know Google has a Python script that does this well, here .

  But I would like to inject metadatas in my app as well, any help would be much appreciated,

  thanks !

• Flutter : Running FFmpeg.execute to generate thumbnails in a different isolate doesn't work ?

  12 novembre 2024, par Vasudev

  This is the current code to generate thumbnails for Video and Audio files.. It is working fine in most cases.

  


  @override&#xA;Future<imageprovider> thumbnail(String path,&#xA;{required double width, required double height}) async {&#xA;&#xA;&#xA;  final FFmpegSession session = await FFmpegKit.executeAsync(&#xA;          "-loglevel quiet -i &#x27;$filePath&#x27; -y -ss 00:00:00.000 -vframes 1 &#x27;$thumbnailPath&#x27;");&#xA;&#xA;&#xA;  final returnCode = await session.getReturnCode();&#xA;  if (returnCode == null || returnCode.isValueError()) {&#xA;    throw Exception("Thumbnail generation failed");&#xA;  }&#xA;&#xA;/* Returns ImageProvider */&#xA;}&#xA;</imageprovider>

  


  Now in iOS, for large files, the thumbnail generation doesn't really fail. But takes a long time and doesn't complete at all.

  


  This causes performance issues. I would like to run this FFmpeg.execute() in a different isolate, but it doesn't work at all.

  


    final FFmpegSession session = await Isolate.run(
    () async {
      return await FFmpegKit.executeAsync(
          "-loglevel quiet -i '$filePath' -y -ss 00:00:00.000 -vframes 1 '$thumbnailPath'");
    },
  );


  


• ffmpeg timelapse discard garbage jpg [duplicate]

  12 mai 2021, par piekn

  I'm successfully creating timelapse video (jpg->mp4) using command line
$ffmpeg -r $fps -f concat -safe 0 -i $concat_file -c:v libx264 -vf 'format=yuv420p' $thumbnail 2>&1 &

  


  But some of source jpg are 'garbage' (look picture below what I mean) - part of the picture is lost.
part of picture is lost

  


  As result, final clip contains damaged frames (see below)
final clip

  


  As I see, the best for me is to discard these jpg. But I have no ideas how to define them ? - file system don't see them as 'broken', etc.

  


  Any ideas ?