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• Is ffmpeg using a buffer ? Why arent the filename and drawtext times matching ?

  6 octobre 2018, par Ian Rubenstein

  I am using ffmpeg to

  1) capture images from a webcam as jpeg with the timestamp in the filename and as an overlay with drawtext

  ffmpeg -s 1920x1080 -framerate 20 -i /dev/video1 -f image2 -ss 8 -s 1920x1080 -qscale:v 1 -r 1 -strftime 1 -vf setpts=.2*PTS, drawtext=fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf: text='%{localtime\:%Y-%m-%d_%T}': fontcolor=white: fontsize=24: box=1: boxcolor=black@0.5: boxborderw=5: x=(w-text_w)*.04: y=(h-text_h)*.96 /home/ian/netdrives/antares/Pictures/plant_lapse/ir/20181004/plant.%Y%m%d_%H%M%S.jpeg

  2) combine the images into a timelapse video

  C:/Users/Ian/apps/ffmpeg/bin/ffmpeg -f concat -safe 0 -i processingfilelist.ir_20181004.txt -c:v h264_nvenc -rc constqp -qp 38 -s 1920x1080 -filter:v format=yuv420p,fps=60,scale=iw/1.5:-1,yadif=0:-1:0,hqdn3d plant_lapse_ir_20181004_074451_dusk.mp4

  Its generally working, but I noticed the filenames are one frame ahead of the timestamp shown in the overlay.

  Example Image - Im not smart enough to know which is the right time, just to know that I’d like them to match. Any ideas why they don’t ?

• PHP - Upload video convert mp4 and upload to Amazon S3

  31 octobre 2019, par Kadir Geçit

  I’m using amazon s3 as video storage for my website. I’m having problems for some videos. black screen or sound problems etc.

  I want to convert the video to mp4 format after uploading the video to my server and then upload it to amazon. Is it possible with FFMPEG ?

  I’m using this code for uploading files now :

  $file1 = $_FILES['file']['name'];
  
  $videoFileType = strtolower(pathinfo($file1,PATHINFO_EXTENSION));
  
  $file_name = sprintf('%s_%s', uniqid(),uniqid().".".$videoFileType);
  
  $temp_file_location = $_FILES["file"]["tmp_name"];
  
  
  
  require 'application/libraries/Amazon/aws-autoloader.php';
  
          $s3 = new Aws\S3\S3Client([
  
              'region'  => $amazon_region,
  
              'version' => 'latest',
  
              'credentials' => [
  
              'key'    => $amazon_key,
  
              'secret' => $amazon_secret,
  
              ]
  
          ]);     
  
  
  
          $result = $s3->putObject([
  
              'Bucket' => $amazon_bucket,
  
              'Key'    => $file_name,
  
              'SourceFile' => $temp_file_location,
  
              'ACL'    => 'public-read',
  
              'CacheControl' => 'max-age=3153600',
  
          ]);
  
              $filepath = $result['ObjectURL'] . PHP_EOL;
  
  
  
              echo json_encode([
  
                  'status' => 'ok',
  
                  'path' => $filepath
  
  
  
              ]);

• Video Stabilization with spin product OpenCV

  28 mars 2021, par a.masri

  I'm trying to stabilize video using OpenCV, but my video is a walkaround 360 spin like this spin, but the stabilize not perfect has a shaking because the optical flow not working perfectly with the spined video

  


  can you find python code here

  


  and I'm trying to use FFmpeg but still, have the same issue,

  


  this command

  


  INPUT=$1
STB_OUTPUT=stb1.mp4

ffmpeg -y -i "$INPUT" -vf vidstabdetect=stepsize=32:shakiness=5:accuracy=15:result="$TRF" -f null -

ffmpeg -y -i "$INPUT" -vf vidstabtransform=input="$TRF":smoothing=30,unsharp=5:5:0.8:3:3:0.4  "$STB_OUTPUT"