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• Generate a .JSON file in After Effects or Premiere ?

  9 avril 2021, par Ryan

  I am working on a video template app where users can pick a video template and add their images as background layer and render a .mp4 video.

  


  Each template which I upload to the server is a Zip file which consists of 4 elements
1 : Background Video
2 : Source Images
3 : Output Video
4 : .JSON file

  


  I am a motion designer and not good with code, however when I check the .JSON file, I can tell that its holding some sort of animation data, I can see the text pointing towards the source images and the background video and a bunch of other text data which I think is basically animating the source images.

  


  Now being a motion designer, I can make some really nice animation overlays and simply replace it with the BACKGROUND VIDEO element and yes it works. And I can make as many animation templates I want using this one .JSON file.

  


  However (This is where the limitation starts), even though I can have really exciting overlay animations, the base source images are just 3 images fading in and out, and this data is coming from the .JSON file.

  


  What would be really nice, is if I could some how create/generate my own .JSON files, this way I can have the source images animate however I like (Position, Scale, Rotate) but I have no clue how this .JSON can be generated.

  


  This link has the main files which make up one template. You can check the .JSON file and how it works with other elements.
One Template Files

  


• Configure ffmpeg to use concat

  22 janvier 2016, par Lins Louis

  This is my jni ’c’ Code For Concatinate a list of mp3 files in sdcard using ffmpeg in Android

  JNIEXPORT jint JNICALL Java_Test_Mp3_Merger_Audio_mergeAudio(JNIEnv *env,
  
          jclass someclass, jstring inputFile, jstring outFile) {
  
      log_message("Starting to trim video");
  
  
  
      int numberOfArgs = 8;
  
      char** arguments = calloc(numberOfArgs, sizeof(char*));
  
      char start[5], duration[5];
  
      const char *in, *out;
  
  
  
  
  
      in = (*env)->GetStringUTFChars(env, inputFile, 0);
  
      out = (*env)->GetStringUTFChars(env, outFile, 0);
  
      //ffmpeg -f concat -i mergelist.txt -c copy a.mp3 // this comand worked pecrfect in my computer terminal..
  
      arguments[0] = "ffmpeg";
  
      arguments[1] = "-f";
  
      arguments[2] = "concat";
  
      arguments[3] = "-i";
  
      arguments[4] = in;
  
      arguments[5] = "-c";
  
      arguments[6] = "copy";
  
      arguments[7] = out;
  
  
  
      int i;
  
      for (i = 0; i < numberOfArgs; i++) {
  
          log_message(arguments[i]);
  
      }
  
      log_message("Printed all");
  
  
  
      ffmpeg_main(numberOfArgs, arguments);
  
      log_message("Finished");
  
      free(arguments);
  
      (*env)->ReleaseStringUTFChars(env, inputFile, in);
  
      (*env)->ReleaseStringUTFChars(env, outFile, out);
  
      return 0;
  
  }

  The below is my config.h generated with config.mak
  https://drive.google.com/file/d/0B4VBZ6KJJazSWHBqQWJpWHhuZnM/view?usp=sharing

  And Whenever i call the native method trim()
  i got the error message Unknown input format : ’concat’.

  But the concat.c is showing as compiled when compiling with ndk
  What is wrong ?

• VLC/ffplay can't read some audiotracks created by ffmpeg

  19 juin 2021, par skanarr

  I have two different .mkv files of the same movie. One contains the English, German, Italian, Spanish and French audio and subtitle tracks, the other contains Japanese Audio and Subtitle tracks. Since I want to have all tracks in one file I tried to 'merge' them using :

  


  $ ffmpeg -i "Assassin's Creed (2016).mkv" -i "./Other/Assassin's Creed_t13.mkv" -map 0:v -map 0:a -map 1:a:2 -map 0:s -map 1:s:1 -map 1:s:2 -map 1:s:3 -c:v copy -c:s copy -c:a copy tmp2.mkv


  


  Full Command Output from ffmpeg

  


  However playing it in VLC none of the Tracks from ./Other/Assassin's Creed_t13.mkv are working properly.
There are short periods where there is audio and then it is gone again for some minutes.
Also tmp2.mkv freezes at 4:44 and freezes VLC for some time, before only audio continues top play.
Looking under Messages this is what I got : All Message from VLC
(Messages were set to display warnings and errors)

  


  I don't know what I did wrong. The Japanese tracks are working in ./Other/Assassin's Creed_t13.mkv.
The all non-japanese Tracks are still working in tmp2.mkv.
Also there are working Tracks with the same codecs on tmp2.mkv (dts) as well as subtitles (pgs).

  


  I then tried playing it with ffplay and got the same result.
Whenever i switched the audiotrack to stream 7 (the japanese audio)
It said non A-V: non in the little progress bar instead of the usual numbers.