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• Dynamically embed information and/or images to video stream using FFMPEG (Or similar)

  25 février 2016, par Jorge Anzola

  amigos.

  I need to stream a sport event and I want to add information to the transmission (such as score, time, yellow cards, etc). Is there a way to do this with FFMPEG ? I already know I can add an Image (like a logo) that would be always in the same corner without changes.

• ffmpeg scale, how to crop correctly

  23 mars 2015, par sathia

  I’m using this command to encode videos

  $transcode = FFMPEG_BINARY.' -loglevel panic -y -i "'.$files['original'].'" -vf scale='.VIDEO_SIZE_X.':'.VIDEO_SIZE_Y.' -vcodec libx264 -profile main -preset slow -r 25 -b '.VIDEO_BITRATE.' -maxrate '.VIDEO_BITRATE.' -bufsize 1000k -threads '.VIDEO_THREADS.' -acodec aac -ar 44100 -f mp4 -strict -2 '.$files['mp4'];
  
  
  
  where: VIDEO_SIZE_X = 640 and VIDEO_SIZE_Y = 480, VIDEO_BITRATE = 900k

  it all seems to work fine, but the problem I’m having is that the video is not resized to the desired size which is 640x480

  

  ^ This is the output from vlc

  It looks like there’s some reference to the desired size, but the video is not scaled/cropped,
  what’s the correct way of scaling videos in order to have the desired size ? I don’t mind having black stripes above and below or bands at the sides.

  so, here’s a bit of debugging as requested :

  /usr/bin/ffmpeg -loglevel panic -y -i "in.wmv" -vf scale=640:480 -vcodec libx264 -profile main -preset slow -r 25 -b 900k -maxrate 900k -bufsize 1000k -threads 8 -acodec aac -ar 44100 -f mp4 -strict -2 out.mp4

  original video :

  [wmv3 @ 0x13245c0] Extra data: 8 bits left, value: 20
  
  Input #0, asf, from 'in.wmv':
  
    Metadata:
  
      WMFSDKVersion   : 12.0.9600.16384
  
      WMFSDKNeeded    : 0.0.0.0000
  
      IsVBR           : 1
  
      VBR Peak        : 313
  
      Buffer Average  : 397
  
    Duration: 00:06:09.13, start: 0.000000, bitrate: 2111 kb/s
  
      Stream #0:0: Audio: wmav2 (a[1][0][0] / 0x0161), 48000 Hz, 2 channels, s16, 96 kb/s
  
      Stream #0:1: Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 860x484, 2000 kb/s, SAR 1:1 DAR 215:121, 29.97 tbr, 1k tbn, 1k tbc
  
  [wmv3 @ 0x13245c0] Extra data: 8 bits left, value: 20

  while the result is :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf54.29.104
  
    Duration: 00:06:08.76, start: 0.000000, bitrate: 975 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 640x480 [SAR 645:484 DAR 215:121], 842 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 125 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler

  cheers

• how to set ffmpeg bitrate, frame per second when scalling from low to high resolution/ high to low

  21 janvier 2015, par user2303069

  I’m developing a video sharing app for mobile device users. I noticed if I convert video with ffmpeg from a low(ex 240x320) to a higher resolution(ex 480x-1) the video looses quality and also there is no sound at the end. My question to you is how should I filter(how many fps,bitrate ect) the converted file ? In terms of parameters, how should I convert to make sure the video comes out in good quality at it’s destination(the user who will play it on their mobile device[Android/BlackBerry]).

  Here is my current code(java) :

  /************************  CONVERTING    TIME   *************************
  
                         method to convert video-clip
  
  */
  
  if(sn.toString().trim().startsWith("<>")){
  
      String info=sn.toString().trim().substring(2);
  
      String scale=info.substring(0, info.indexOf("."));
  
      String width=scale.substring(0, scale.indexOf("x"));
  
      String name=info.substring(info.indexOf(".")+1, info.length());
  
      String to = null;
  
      String from;
  
  
  
      try{
  
          //calculate to and from
  
          to=name.substring(0, name.indexOf("$"));
  
          from=name.substring(name.indexOf("$")+1, name.lastIndexOf("$"));
  
          gui.textArea1.append("\nStart converting...: to="+to+" from="+from+" fileName="+name);
  
      }catch(NullPointerException npe){
  
          gui.textArea1.append("\nNullpointer in calculate name in converting: "+npe.getMessage());
  
      }
  
  
  
      final Path videoIn = Paths.get("c:\\wamp\\www\\iclips\\videoMessages\\"+name);
  
      final Path encodingFile = Paths.get("c:\\wamp\\www\\iclips\\videoMessages\\scaled-"+name);
  
      final Path errorFile = Paths.get("c:\\ffmpeg\\bin\\error.txt");
  
      String pro;
  
      int w=Integer.parseInt(width);
  
  
  
      if(w<=240){
  
          pro="baseline";
  
      }else if(w>240&&w<=480){
  
          pro="main";
  
      }else if(w>480){
  
          pro="high";
  
      }else{
  
          pro="baseline";
  
      }
  
      //int retCode;
  
  
  
      try {
  
          Files.deleteIfExists(encodingFile);
  
          Files.deleteIfExists(errorFile);
  
  
  
          final ProcessBuilder pb 
  
              = new ProcessBuilder("c:\\ffmpeg\\bin\\ffmpeg.exe",
  
                  "-i", videoIn.toString(),
  
                  "-y", 
  
                  "-vf", "scale="+width+":-1", 
  
                  // "-pix_fmt","yuv420p",   
  
                  "-vcodec", "libx264",
  
                  "-vprofile", pro,    
  
                  "c:\\wamp\\www\\iclips\\videoMessages\\scaled-"+name
  
          ); //or other command....                    
  
  
  
          pb.redirectError(errorFile.toFile());
  
          pb.redirectOutput(encodingFile.toFile());
  
  
  
          final Process p = pb.start();
  
          try {
  
              p.waitFor();
  
              if(p.exitValue()==0){
  
                  gui.textArea1.append("\n+++++++++++++Vic-^clip converted successfully:"
  
                          + " ExitValue=["+String.valueOf(p.exitValue())+"] ++++++++++++++");
  
                  if(Files.deleteIfExists(videoIn)){
  
                      gui.textArea1.append("\n"+videoIn.toString()+" deleted!");
  
                  }
  
                  sendMsg("Scalling successfull:-)   Video-clip name=scaled-"+name+"_", "\nSent scaled successfull "+username);
  
                  NotifyClientOfScaledVideoMessage(to,"^scaled-"+name+"_");
  
              }else{
  
                  gui.textArea1.append("\nSomething went wrong with process-convert: ExitValue="+String.valueOf(p.exitValue()));
  
                  sendMsg("Unable to scale video, try again._", "\nSent scaled failed to "+username);
  
              }
  
          } catch (InterruptedException e) {
  
              gui.textArea1.append("\nInterrupted process convert: "+e.getMessage());
  
          }
  
      } catch (IOException e) {
  
          // deal with e here
  
          gui.textArea1.append("\nIOException in Convert Video: "+e.getMessage());
  
      }
  
  }

  Thank you very much.