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• Overlying video frames using FFmpeg in c++

  14 mai 2020, par Bruce

  I am trying to overlaying two videos using FFmpeg in c++. So I followed the FFmpeg page and followed this command in terminal.

  



  $ ffmpeg -i Right.mov -i Left.mov -filter_complex "[0:v][1:v] overlay=0:0"  -c:a copy output.mov


  



  I can implement this functionality through the terminal, but I am trying to achieve this functionality through codding.

  



  typedef struct {
    AVFormatContext *fmt_ctx;
    int stream_idx;
    AVRational time_base;
    AVStream *video_stream;
    AVCodecContext *codec_ctx;
    AVCodecContext *pCodecCtxOrig;
    AVCodec *decoder;
    AVPacket *packet;
    AVFrame *av_frame;
    AVFrame *gl_frame;
    AVFrame *out_frame;
    AVStream *pStream;
    struct SwsContext *conv_ctx;


  



  also, I show some example code, but I am not sure about it

  



  https://ffmpeg.org/doxygen/2.1/doc_2examples_2filtering_video_8c-example.html

  



  and 
https://code5.cn/so/c%2B%2B/2601062

  



  AVFilterContext *buffersink_ctx;
AVFilterContext *buffersrc_ctx;
AVFilterGraph *filter_graph;


  



  how can I implement this functionality in my code ?

  


• Bash, Relative Paths, and Mac Automator Fails

  30 septembre 2015, par grahama

  This script works great in the terminal but fails when I run the shell script in automator (mac). For some reason, automator doesn’t remember the gif’s name and writes the file as *.gif. When run directly in Terminal, the script correctly converts to movie file to Gif and moves it to the correct Dropbox location.
  I’m trying to run this automator Mov2Gif script when Apple Motion 5 finishes rendering a movie.

  Any help is appreciated. Automator is a little touchy.

  #!/bin/sh
  
  
  
  fps=8
  
  scale=400
  
  palette="/tmp/palette.png"
  
  filters="fps=$fps,scale=$scale:-1:flags=lanczos"
  
  
  
  destDIR="/PATH/TO/DROPBOX/DIR"
  
  curDIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
  
  incomingDIR=$curDIR/_incoming
  
  
  
  ffmpeg=$curDIR/ffmpeg/ffmpeg
  
  
  
  
  
  for f in *.mov
  
  do  
  
  
  
      fbname=$(basename "$f" .mov)
  
      fbAbsPath=$incomingDIR/$fbname
  
      $ffmpeg  -v warning -i $fbAbsPath.mov -vf "$filters,palettegen" -y $palette
  
      $ffmpeg -v warning -i $fbAbsPath.mov -i $palette -lavfi "$filters [x]; [x][1:v] paletteuse" -y $fbAbsPath.gif
  
      rm $fbAbsPath.mov
  
      mv -f $fbAbsPath.gif $destDIR/$fbname.gif
  
  done

• ffmpeg lib/API to cut videos in java

  23 janvier 2017, par João Paulo Radd

  I’m trying to use some FFmpeg’s lib/API to java to cut a video in several parts by time. I know that I can use RunTime with a command to this, but in my case I need use this in code using some API/lib.
  Example command in terminal / runtime :

  ffmpeg -i /tmp/test.mp4 -ss 30 -c copy -to 40 /tmp/outTest.mp4

  ---

  String url_str = "ffmpeg -i /tmp/"+fileName+".mp4 -ss "+secStart+" -c copy -to "+secEnd+" /tmp/"+outfile+".mp4 -y";
  
      System.out.println("url_str :"+url_str);
  
          try {
  
              Runtime rt = Runtime.getRuntime();
  
              Process p = rt.exec(url_str);
  
              BufferedReader r = new BufferedReader(new InputStreamReader(p.getErrorStream()));
  
              String s;
  
              while ((s = r.readLine()) != null) {
  
                  //System.out.println(s); terminal response
  
              }
  
              r.close();

  Thus, I’ve a original video and a inicial time in seconds and a final time (some cases, optional) and create a new video with this part.
  I’m trying to use the FFmpeg Java by Andrew Brampton (net.bramp.ffmpeg) to do the same thing as the example. But, if some one know by other API/lib, like FFMPEG-Java (net.sf.ffmpeg_java) for example, will be good too.