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• What are the options I should use with ffmpeg to convert mov and mp4 into webm to have the best playback support on Android WebView ?

  18 novembre 2019, par georget

  Android version : 8.1
  WebView is WebChromeClient

  If I understand from this page (https://developer.android.com/guide/topics/media/media-formats) the most supported format should be vp8 & webm. Is this correct ?

  I’m using a webview to show several videos as part of a slideshow. But noticed that some of the videos don’t play. So far all webm files play without issues. The videos are played without user action using JS after setting mWebview.getSettings().setMediaPlaybackRequiresUserGesture(false);

  What are the options I should pass to ffmpeg to convert mov and mp4 files into webm with best chance of playback on WebView ?

  Currently I’m using this : ffmpeg -i .mp4 -vcodec libvpx -qmin 0 -qmax 50 -crf 10 -an -b:v 1M .webm

  We don’t need video in any of the resulting files, hence the -an flag.

• Creating a video from data of server-side script

  8 mars 2016, par Peter Leupold

  My plan is to display the data that a server-side script generates in a video displayable on my web page. So far my approach is the following :

  1. A three dimensional integer array in a C script is use to accumulate the image data. Dimensions are width, breadth and color (R, G and B).
  2. The array is written to a ppm-file.
  3. The next picture is accumulated and written and so on.
  4. With ffmpeg a script merges the ppm-files to a mp4-video.

  Basically this works, but of course faster would be nicer. I would appreciate proposals for fundamentally different approaches as well as help on the following details :

  • Is there a file format simple as ppm that uses the HEX code for colors instead of triplets ? This would reduce the size of my array as well a the number of write operations.
  • Do I loose much time if I print every single value to the file with an fprintf operation instead of accumulating lines into a string ? Or do compilers optimize this kind of sequences of writes ?

• How to apply filter to video using ffmpeg c program android ndk

  13 juillet 2016, par Rajkumar

  I am newbie to ffmpeg with android. I have an input video birds.mp4 that have following settings

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'birds.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf54.59.106
  
    Duration: 00:00:21.60, start: 0.000000, bitrate: 574 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 320x176 [
  
  SAR 44:45 DAR 16:9], 440 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, flt
  
  p, 127 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  I have compiled ffmpeg with libx264 as *.so file for android. And i write a Jni wrapper. Now I want to apply a filter to that input video and save it to output.mp4 with same setting as shown. I know basic terminologies encoding, decoding, muxing, transcoding.
  I want to know How to do this task ? and What are the techniques involved to do this task ?

  I use ffmpeg-3.1 c-source code grabbed from github and x264 from videolan site. i refer this sample it doesn’t guide me.

  If anybody experienced this problem please guide me right direction.