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• Trying to get property of non-object while uploading to database

  26 novembre 2017, par Programmmereg

  I have a script when user can clip video, then that video uploads to public folder, and now I want to upload all video data to database. But i get error like in title. Here’s my code :

  Controller :

  public function clip($id)
  
      {
  
          $video = Video::where('id', $id)->first();
  
  
  
          $oldId = $video->id;
  
          $originalName = $video->original_name;
  
          $newName = str_random(50) . '.' . 'mp4';
  
  
  
          FFMpeg::fromDisk('public')
  
          ->open('/uploads/videos/' .$video->file_name)
  
          ->addFilter(function ($filters) {
  
          $filters->clip(FFMpeg\Coordinate\TimeCode::fromSeconds(5), FFMpeg\Coordinate\TimeCode::fromSeconds(2));
  
          })
  
          ->export()
  
          ->toDisk('public')
  
          ->inFormat(new \FFMpeg\Format\Video\X264)
  
          ->save('/uploads/videos/' . $newName);
  
  
  
  
  
  
  
          $data = ['user_id'=>Auth::user()->id,
  
              'file_name'=>$newName,
  
              'original_name'=> $originalName,
  
              'old_id' => $oldId,
  
          ];
  
  
  
           $video = Video::edit($data);
  
      }

  Model :

  public static function edit($request)
  
      {
  
          $video = new Video;
  
          $video->user_id = $request->user_id;
  
          $video->file_name = $request->file_name;
  
          $video->original_name = $request->original_name;
  
          $video->save();
  
  
  
          $old = $file = Video::where('id', $request->old_id)->delete();
  
          //$old_file = unlink($request->file('file'));
  
  
  
          return $video;
  
      }

  What should I edit ?

• FFmpeg what exactly is the filtergraph pipeline like during transcoding ?

  8 septembre 2017, par Jeff Gong

  I have been studying the source code for FFmpeg to attempt to understand its threading model and how it processes inputs. For example, when I run a command like :

  ffmpeg -i video.mp4 -s hd720 -c:v libx264 --preset medium -c:a aac -profile:v main -r 60 -f null /dev/null

  The input itself is irrelevant, but I am trying to understand how the transcoding pipeline works. In the source code, I see that the main steps occur in the functions transcode and transcode_step.

  It seems like for a single input, a single frame is read in, decoded, encoded, and written out. The process is obviously very complex but what I am really not understanding is what FFmpeg is doing when it attempts to build out a filtergraph. For example, in transcode_step of ffmpeg.c, there is the following code that happens right after an output stream has been selected :

  if (ost->filter && !ost->filter->graph->graph) {
  
      if (ifilter_has_all_input_formats(ost->filter->graph)) {
  
          ret = configure_filtergraph(ost->filter->graph);
  
          if (ret < 0) {
  
              av_log(NULL, AV_LOG_ERROR, "Error reinitializing filters!\n");
  
              return ret;
  
          }
  
      }
  
  }

  Does this only apply if I specify a specific series of filtering options to FFmpeg, like the one in this link ? For the sample command I input above, is this code still executed ?

  One last other question I had was for the case where I run an FFmpeg instance with a single input but multiple outputs (perhaps different variants for transcoding). In this scenario, does a single phase of transcode_step take in an input frame and send that frame through decoding and encoding for only a single one of the outputs ? Or does it take a frame at a time and process this frame for each of the outputs we have specified ?

• libavfilter : vf_drawbox filter support draw box with detection bounding boxes in...

  14 mai 2021, par Ting Fu

  libavfilter : vf_drawbox filter support draw box with detection bounding boxes in side_data
  This feature can be used with dnn detection by setting vf_drawbox's
  
  option box_source=side_data_detection_bboxes, for example :
  
  ./ffmpeg -i face.jpeg -vf dnn_detect=dnn_backend=openvino:model=face-detection-adas-0001.xml :\
  
  input=data:output=detection_out:labels=face-detection-adas-0001.label,\
  
  drawbox=box_source=side_data_detection_bboxes -y face_detect.jpeg
  Signed-off-by : Ting Fu <ting.fu@intel.com>
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/vf_drawbox.c