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• Combine mp4 init file and m4s segments to a single mp4 file

  5 août 2020, par David Oz

  In my Nodejs server, I'm trying to combine init-file in mp4 format, with some m4s segments.
I've used Buffer.concat() and it partially worked, it seems like the segments hold an offset because they are taken from the middle of a video that is played with mpeg-dash, which causes an incorrect start time. when I use the fluent-ffmpeg npm library, the file is fixed, but it takes way too long (about as long as the video itself).
I was wondering if is it possible to fix the problem by changing some bytes in the buffer or anything faster like that.

  


• is it possible to merge 2 videos to a single video using FFMPEG in flutter

  22 juillet 2020, par I'm Sunil3

  I am developing an application in flutter, user add two videos and I want to merge them into a single video and give the output containing two video side by side, the given videos will have different height and different width.

  


  Currently am using a FFmpeg command
'-i $filePath -i $widget.videopath -filter_complex hstack $combinedvideopath'
to merge two video files.
it prompting me a error,

  


  input 1 height 512 does not match input 0 height 1280.

  


• extracting single frame from MediaElemet or FFmpegInterop

  13 janvier 2016, par Jakub Wisniewski

  I am writing app (Windows Phone 8.1 Store App) that allows user to connect to IP Camera. I am using FFmpeg Interop library for ffmpeg which allows me to play eg. rtsp streams in media element. I need now a way to somehow extract a single frame from stream or from media element.

  I have tested other application wchih allows connecting to IP cameras - IP Centcom, and they have working snapshots only for mjpeg streams as far as I now (they were not working for rtsp). Becouse of that I belive that it is impossible or at very least very hard to export frame from media element.

  I have different question - if anyone has ever used FFmpeg Interop and would like to help/explain me how could I modify/extend FFmpegInteropMSS to add method called ’GetThumbnailForStream’ that would work similary to ’GetMediaStreamSource’ but would return single frame (bitmap or jpg) instead of MediaStreamSource ?

  Every help would be appreciated

  EDIT :

  I have found something ;

  in MediaSampleProvider in method WriteAVPacketToStream (line 123) there is line

  auto aBuffer = ref new Platform::Array(avPacket->data, avPacket->size);

  and I belive that this is the place that stores single frame data that is needed to convert into bitmap - now since I do not know c++ too much I have a question : how can I convert it into a form that I could return via public method ?

  When returning :

  Platform::Array^

  I get

  ’FFmpegInterop::MediaSampleProvider’ : a non-value type cannot have any public data members

  EDIT2 :

  Ok I am doing approprate projection to byte according to this microsoft information, now I need to check if this is correct data.