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• Is there any option to create a single frame thumbnail for a video in java ?

  13 juin 2020, par Prashanth Shyamprasad

  Is there any option to create a single frame thumbnail for a video in java with java libraries.

  



  I am using Jave2 in my application. Does Jave2 provides any such options ? I didn't find a single documentation related to this.

  



  I heard Xuggler provides some options. But I don't want to move to Xuggler if Jave2 provides the facility as I'm already using Jave2 for many purposes extensively. Adding a full library like Xuggler is an overhead. Replacing Jave2 with Xuggler also is a tedious task

  



  If any light weight thumbnail feature specific utility library is available, then that should also be fine.

  


• Building FFmpeg for android to run command line args

  11 septembre 2012, par Zargoon

  I am trying to build the FFmpeg library to use in my android app with the NDK. The reason for this is because I am using the native video capture feature in android because I really don't want to write my own video recorder. However, the native video capture only allows for either high-quality encoding, or low quality encoding. I want something in between, and I believe that the solution is to use the FFmpeg library to re-encode the high quality video to be lighter.

  So far I have been able to build the FFmpeg library according to this guide : http://www.roman10.net/how-to-build-ffmpeg-for-android/ and which a few tweaks I have been able to get it to work.

  However, everything that I've found seems to be about writing your own encoder, which seems like overkill to me. All that I really want to do is send a string in command line format to the main() function of FFmpeg and re-encode my video. However, I can't seem to figure out how I build FFmpeg to give me access to the main method. I found this post : Compile ffmpeg.c and call its main() via JNI which links to a project doing what I want more of less, but for the life of me I cannot figure out what is going on. It also seems like he is compiling more than I want, and I would really like to keep my application as light weight as possible.

  Some additional direction would be extremely helpful. Thank you.

• FFMPEG : Redirecting Matroska muxed data to socket

  14 août 2016, par Parth Shah

  I am using FFMPEG library to mux H.264 and AAC frames to Matroska (.mkv) file. I can do that both using command line and C program.

  Now, instead of writing the muxed matroska data in to file I want to write these muxed data directly on to socket or pipe. My actual goal is to write a C program that send muxed data to socket and server will receive this muxed data.

  I tried using protocol tcp. They are working with the matroska format.
  So, My C program is able to send muxed data successfully over socket and server is able to receive this muxed data.

  But when I apply ffprobe command over the received file, I am getting duration and bitrate field N/A. and when I tried to play this file with vlc i am unable to seek the file and getting garbage duration.

  Below the output of the ffprobe.

  ffprobe version N-65784-g50a35f0 Copyright (c) 2007-2014 the FFmpeg developers
  
    built on Aug 25 2014 12:31:36 with gcc 4.7 (Ubuntu/Linaro 4.7.3-1ubuntu1)
  
    configuration: 
  
    libavutil      54.  5.100 / 54.  5.100
  
    libavcodec     56.  0.101 / 56.  0.101
  
    libavformat    56.  1.100 / 56.  1.100
  
    libavdevice    56.  0.100 / 56.  0.100
  
    libavfilter     5.  0.101 /  5.  0.101
  
    libswscale      3.  0.100 /  3.  0.100
  
    libswresample   1.  1.100 /  1.  1.100
  
  Input #0, matroska,webm, from 'Array.mkv':
  
    Metadata:
  
      ENCODER         : Lavf54.29.104
  
    Duration: N/A, start: 1412858260.281000, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg), 2000x1496 [SAR 1:1 DAR 250:187], 27 fps, 27 tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:1: Video: mjpeg, yuvj422p(pc, bt470bg), 2000x1496 [SAR 1:1 DAR 250:187], 27 fps, 27 tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:2: Video: mjpeg, yuvj422p(pc, bt470bg), 2000x1496 [SAR 1:1 DAR 250:187], 27 fps, 27 tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:3: Video: mjpeg, yuvj422p(pc, bt470bg), 2000x1496 [SAR 1:1 DAR 250:187], 27 fps, 27 tbr, 1k tbn, 1k tbc (default)

  As You can see Duration and Bitrate field shows N/A. However I am getting correct startTime.

  Any help or advice ? Thank you in advance.