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• avcodec/libvpxenc : update the ranges for "cpu_used" so it matches the "speed" alias

  6 juin 2014, par Michael Niedermayer

  avcodec/libvpxenc : update the ranges for "cpu_used" so it matches the "speed" alias
  Reviewed-by : James Zern <jzern@google.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/libvpxenc.c

• python request.put causing my entire function to loop infinitely

  16 mars 2018, par M.Izzat

  I created a function to convert a video using ffmpeg on form save and then update the same entry with the new convered video path using API request.put, but for some reason this function cause the ffmpeg to convert the video over and over again, how can I terminate the process without closing my terminal. also because im using 'rb' it create a new video file with binary which I’m not needed and update that in my database, I try using 'r' and 'r+' but its not working

  Be low is my code :

  def video_conversion(video_id, raw_file):
  
      cmd = "ffmpeg -i {} -s 1280x720 {}".format(input, output)
  
      thumbnail_cmd = "ffmpeg -ss {} -i {} -vframes 1 {}".format(middle_duration, input, image_output)
  
      subprocess.call(cmd)
  
      subprocess.call(thumbnail_cmd)
  
      mp4_480_file = {'mp4_480': open('D:/Development/VideoConverter/media/{}.mp4'.format(filename), 'rb')}
  
      video_request = requests.put(
  
                  'http://127.0.0.1:8000/api/lemoncore/video_detail/{}/'.format(video_id),
  
                  data={'id': video_id},
  
                  files=mp4_480_file
  
                  )
  
      video_request.close()
  
      return output

• Is packet duration guaranteed to be uniform for entire stream ?

  13 décembre 2013, par karl_

  I use packet duration to translate from frame index to pts and back, and I'd like to be sure that this is a reliable method of doing so.

  Alternatively, is there a better way to translate pts to a frame index and vice versa ?

  A snippet showing my usage :

  bool seekFrame(int64_t frame)
  
  {
  
      if(frame > container.frameCount)
  
          frame = container.frameCount;
  
  
  
      // Seek to a frame behind the desired frame because nextFrame() will also increment the frame index
  
      int64_t seek = pts_cache[frame-1];  // pts_cache is an array of all frame pts values
  
  
  
      // get the nearest prior keyframe
  
      int preceedingKeyframe = av_index_search_timestamp(container.video_st, seek, AVSEEK_FLAG_BACKWARD);
  
  
  
      // here's where I'm worried that packetDuration isn't a reliable method of translating frame index to 
  
      // pts value
  
      int64_t nearestKeyframePts = preceedingKeyframe * container.packetDuration; 
  
  
  
      avcodec_flush_buffers(container.pCodecCtx);
  
  
  
      int ret = av_seek_frame(container.pFormatCtx, container.videoStreamIndex, nearestKeyframePts, AVSEEK_FLAG_ANY);
  
  
  
      if(ret < 0) return false;
  
  
  
      container.lastPts = nearestKeyframePts;
  
  
  
      AVFrame *pFrame = NULL;
  
  
  
      while(nextFrame(pFrame, NULL) && container.lastPts < seek)
  
      {
  
          ;
  
      }
  
  
  
      container.currentFrame = frame-1;
  
      av_free(pFrame);
  
      return true;
  
  }