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• How to specifiy ffmpeg creation time as the segment creation time

  6 novembre 2023, par şahin

  I am using ffmpeg to create video records from streams. Ffmpeg command creates segments from the streams. Think that 24 hours record with ffmpeg and divide it into 1 hour segments so i have 24 video records at the end. Problem is that ffmpeg always put the first segment creation time to the following ones meta data. Last video has the first video creation time. How to create segments with the time they created ?

  


  My ffmpeg commands

  


  ffmpeg -y -buffer_size 500000 -thread_queue_size 128 -i $1 -metadata title=$2 -metadata creation_time="`date +%F` `date +%T`" -c:a copy -c:v copy -f segment -segment_time 01:00:00 segment_format mp4


  


• create video chunks with giving start and end time using ffmpeg and play those chunks sequentially with expiry time for each chunk using java

  4 octobre 2018, par JAVA Coder

  I have done like this I found it from the given link Just modified the code for start and end time and hard coded the times.
  Split video into smaller timed segments in Java

  @RequestMapping(value="/playVideo",method = RequestMethod.GET)
  
  @ResponseBody
  
  public void playVideo() {
  
      System.out.println("controller is working");
  
      int videoDurationSecs = 1800 ;
  
      int numberOfChunks = 5;//dynamically we can define according to video duration
  
       int chunkSize = videoDurationSecs/(numberOfChunks);
  
          int startSecs = 0;
  
          for (int i=0; i/*******Create video chunk*******//
  
  
  
              String startTime = convertSecsToTimeString(startSecs);
  
              int endSecs = startSecs+chunkSize;
  
              startSecs = endSecs+1; 
  
              if (endSecs > videoDurationSecs) {
  
                  //**make sure rounding does not mean we go beyond end of video**//
  
                  endSecs = videoDurationSecs;
  
              }
  
              String endTime = convertSecsToTimeString(endSecs);
  
  
  
              System.out.println("start time for-------------------->>>> "+startTime);
  
              System.out.println("end time for------------------->>>> "+endTime);
  
  
  
              /*
  
               * how to do this means send times for chunk and 
  
               * getting chunks and play them one by one like one video 
  
               * with expiry time for each
  
               */
  
  
  
  
  
              //Call ffmpeg to create this chunk of the video using a ffmpeg wrapper
  
              /*String argv[] = {"ffmpeg", "-i", videoPath, 
  
                      "-ss",startTime, "-t", endTime,
  
                      "-c","copy", segmentVideoPath[i]};
  
              int ffmpegWrapperReturnCode = ffmpegWrapper(argv);*/
  
          }
  
  
  
  
  
  }
  
  
  
  private String convertSecsToTimeString(int timeSeconds) {
  
      //Convert number of seconds into hours:mins:seconds string
  
      int hours = timeSeconds / 3600;
  
      int mins = (timeSeconds % 3600) / 60;
  
      int secs = timeSeconds % 60;
  
      String timeString = String.format("%02d:%02d:%02d", hours, mins, secs);
  
      return timeString;
  
  }

  }

• FFmpeg : avcodec_open2 returns "Permission denied" (-13)

  24 avril 2019, par maxest

  I wanted to open an encoder, H264, C++, Android. This :

  encoderH264 = avcodec_find_encoder(AV_CODEC_ID_H264);

  works. This one :

  codecContext = avcodec_alloc_context3(encoderH264);

  also works. But I get error "Permission denied" (-13) on that :

  avcodec_open2(codecContext, encoderH264, NULL);

  I’d suppose that my FFmpeg lib does support H264 encoding as avcodec_find_encoder returns valid value (when I used some other FFmpeg lib this function returned null).

  Any ideas ?