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• Big question of Target size, or video bitrate must be specified when using two-pass

  14 juillet 2022, par Rojojun

  I tried to solve the error which is Target size, or video bitrate must be specified when using two-pass.

  


  But I couldn't find how to solve it and how to find path of video exactly I attached my code below this post

  


  Please give me some tips of solving the problem !

  


  @Service
public class ThumbnailService {

    public HashMap exportThumbnail(File file) throws Exception {
        // file is from controller and form-data
        //String inputPath = "Users/hojunna/Download/my/";
        //String outputPath = "/usr/local/video/thumbnail/";

        String ffmpegBasePath = "/opt/homebrew/bin/";
        FFmpeg ffmpeg = new FFmpeg(ffmpegBasePath+"ffmpeg");        
        FFprobe ffprobe = new FFprobe(ffmpegBasePath+"ffprobe");    
        
        FFmpegBuilder builder = new FFmpegBuilder()
                .setInput("/Users/hojunna/Desktop/" + file)                         
                //.overrideOutputFiles(true)                    
                //.addExtraArgs("-ss", "00:00:01")          
                .addOutput("/Users/hojunna/Desktop/test.jpg")       
                .setFrames(1)
                .setVideoFilter("select='gte(n\\,10)',scale=200:-1")
                .done();

        FFmpegExecutor executor = new FFmpegExecutor(ffmpeg, ffprobe);      
        executor.createJob(builder).run();                                  
        executor.createTwoPassJob(builder).run();                           

        HashMap resultMap = new HashMap();
        return resultMap;
    }
}


  


• Encoded images into H264 video are skipped and/or missing ?

  25 juillet 2013, par Jona

  I'm trying to encode images into an H264 MP4 video. The issues I'm having is that some of the images are skipped or at the end of the video simply missing. I need the video to play every single image I encode since it is an animation.

  Any help setting the encoder properly would be greatly appreciated !

  Encoder settings :

  AVCodecContext *c;
  
  ...
  
  c->codec_id = AV_CODEC_ID_H264;
  
  c->bit_rate = mOutputWidth*mOutputHeight*4;//400000;
  
  /* Resolution must be a multiple of two. */
  
  c->width    = mOutputWidth;
  
  c->height   = mOutputHeight;
  
      /* timebase: This is the fundamental unit of time (in seconds) in terms
  
       * of which frame timestamps are represented. For fixed-fps content,
  
       * timebase should be 1/framerate and timestamp increments should be
  
       * identical to 1. */
  
  c->time_base.den = mFps;
  
  c->time_base.num = 1;
  
  c->gop_size      = 12; /* emit one intra frame every twelve frames at most */
  
  c->pix_fmt       = AV_PIX_FMT_YUV420P;
  
  ...
  
  av_dict_set(&pOptions, "preset", "medium", 0);
  
  av_dict_set(&pOptions, "tune", "animation", 0);
  
  
  
  /* open the codec */
  
  ret = avcodec_open2(c, codec, &pOptions);
  
  if (ret < 0) {
  
      LOGE("Could not open video codec: %s", av_err2str(ret));
  
      return -1;
  
  }

  Update 07/24/13 :
  I was able to achieve a better video by setting the gop_size=FPS and writing the last video frame repeatedly FPS+1 times seemed to resolve all issues. To me it seems odd to do that but might be something standard in the video encoding world ? Any tips feedback about this ?

• FFMPEG Command failing in script

  12 octobre 2016, par Jerry

  I have a nodejs script/server that is running an ffmpeg screenshot command every 30 seconds. I have a list of files that I want to screenshot every loop, and I simply feed it into the command like so :

  exec("ffmpeg -ss 00:00:01 -i /secondary/videos/"+file+" -y -vframes 1 -q:v 2 /secondary/snapshots/"+camera_id+".jpg && scp /secondary/snapshots/"+camera_id+".jpg user@host:/path/to/site/img/snapshots/ && rm /secondary/snapshots/"+camera_id+".jpg", function(err,stdo,stde){
  
  });

  file is an absolute path to an flv file such as "vid123.flv". camera_id is an id from a local database of my home security cameras, so they’re numbered 1-100. An example command I’m trying to run is this :

  exec("ffmpeg -ss 00:00:01 -i /secondary/videos/vid123.flv -y -vframes 1 -q:v 2 /secondary/snapshots/1.jpg && scp /secondary/snapshots/1.jpg user@host:/path/to/site/img/snapshots/ && rm /secondary/snapshots/1.jpg", function(err,stdo,stde){
  
  });

  However, when I run this in node, I get an ffmpeg error saying "/secondary/videos/vid123.flv : No such file or directory". If I run the same command in the terminal, I get the correct/expected results - a snapshot/frame at 00:00:01 is taken, saved to a jpg in /secondary/snapshots/, scp’d to another server, and removed from the /secondary/snapshots directory.

  I’m raking my brain right now and I can’t figure out why the different results for the same command.

  Any help/tips are appreciated !