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• How can I apply complex filters more than once with different parameters while avoiding "too many inputs" errors

  15 mai 2019, par Hugh Walxet

  I’m trying to apply the displace complex filter more than once in a video, at specific intervals with no proportional relationship. In each instance, I want to apply the displace filter with slightly different parameters. If I list it twice in the commands for the complex_filter, I get an error saying I have too many inputs.

  I might as well ask, separately, how I could apply the same filter with the same parameters more than once in a video, without re-iterating the same filter more than once in the command line. Put differently, how do I run a filter as specific times without writing the command several times sequentially, each with a different trigger time ?

  C:\Users\Me>ffmpeg -i c:\users\Me\desktop\house2.mp4 -i c:\users\Me\desktop\house3.mp4 -i c:users\Me\desktop\house4.mp4 -filter_complex "shuffleframes=enable='between(t,21,27)':mapping=0 9 2 1 10 5 8 6 7 4 3, shuffleframes=enable='between(t,3,7)':mapping=0 4 9 1 10 5 8 6 2 7 4 3, shuffleframes=enable='between(t,15,19)':mapping=0 6 2 1 10 5 8 3 7 4 9, [0][1][2] displace=enable='between(t,9,10)':edge=wrap, [0][1][2] displace=enable='between(t,20,21)':edge=smear" c:\users\Me\desktop\houseglitch.mp4

• Crash while loading JNI Library

  23 juin 2016, par Amira Elsayed Ismail

  I am using ffmpeg4android_lib to compress video in my android application, it is working in all devices but it does not work in s6 edge and s7 edge

  my code as following :

  String inputFile = FileManager.getInstance().getRealPathFromVideoUri(context, video);
  
                      Log.i("INPUT FILE PATH", inputFile);
  
  
  
                      LoadJNI vk = new LoadJNI();
  
                      try {
  
                          String workFolder = context.getApplicationContext().getFilesDir().getAbsolutePath();
  
                          String outputFile = FileManager.getInstance().getFileFullName(ForSaleConstants.VIDEO_FOLDER,
  
                                  String.format(ForSaleConstants.VIDEO_NAME_FILE_FORMAT,
  
                                          ForSaleConstants.VIDEO_NAME_FILE_NAME_PREFIX, System.currentTimeMillis()));
  
                          String complexCommand[] = {
  
                                  "ffmpeg", "-y"
  
                                  , "-i", inputFile
  
                                  , "-strict", "experimental"
  
                                  , "-s", "320x240"
  
                                  , "-r", "25"
  
                                  , "-aspect", "4:3"
  
                                  , "-ab", "48000"
  
                                  , "-ac", "2"
  
                                  , "-vcodec", "mpeg4"
  
                                  , "-movflags", "+faststart"
  
                                  , "-ar", "22050"
  
                                  , "-b", "2097k"
  
                                  , outputFile};
  
                          vk.run(complexCommand, workFolder, context.getApplicationContext());
  
                          Log.i("OUTPUT FILE PATH", outputFile);
  
                          return outputFile;
  
                      } catch (Throwable e) {
  
                          ForSaleServerManager.getInstance().logAndroidError("Couldn't compress video file");
  
                          return null;
  
                      }

• Does Facebook multicast or unicast the live videos to its viewers ?

  14 avril 2018, par Kamran Zahoor

  This is how a live stream goes from one broadcaster to millions of viewers :

  1. A broadcaster starts a live video on their phone.
  2. The phone sends a RTMP stream to a Live Stream server.
  3. The Live Stream server decodes the video and transcodes to multiple bit rates.
  4. For each bit rate a set of one-second MPEG-DASH segments is continuously produced.
  5. Segments are stored in a datacenter cache.
  6. From the datacenter cache segments are sent to caches located in the points of presence (a PoP cache).
  7. On the view side the viewer receives a Live Story.
  8. The player on their device starts fetching segments from a PoP cache at a rate of one per second.

  My question is simple. After the step 6, does PoP cache/Edge cache/eNB (edge layer node) multicast a live video content to multiple viewers or unicast each user separately (opening up seperate streams for each user) ?