Recherche avancée

Sur d’autres sites (5630)

• Inconsistent Rotation of Output Video OpenCV

  27 avril 2021, par user530316

  I am reading in mobile videos shot on an iphone (.MOV format). When the video is shot upright, ffmpeg meta data states the video frames are rotated 90 clockwise. When I read the video in with opencv as a .MOV and then outwrite again with opencv as a .mp4, both the input and output videos appear upright. Note I display the video frames using opencv via a while loop :
 cap = cv2.VideoCapture("video.MOV")

  


  ret,frame=cap.read()

  


  while ret:
    cv2.imshow('',frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
    ret,frame = cap.read()
cap.release()
cv2.destroyAllWindows() 


  


  This is not the problem. The problem is that when the same video is run on another machine with the same os and same virtual environment, the videos come out rotated by 90 degrees. Any reason this should happen ?

  


  Both machines are using opencv-python version 4.5.1, ffmpeg 4.2.2, and ffmpeg-python 0.2.0.

  


• ffmpeg doesn't write file in docker

  4 janvier 2023, par RaShe

  Goal - Generate video file from PNGs.

  


  command: ffmpeg 
args: [
  "-nostdin",
  "-v",
  "error",
  "-stats",
  "-hide_banner",
  "-y",
  "-f",
  "lavfi",
  "-i",
  "color=c=black:size=1080x1350",
  "-f",
  "image2pipe",
  "-c:v",
  "png",
  "-r",
  "25",
  "-i",
  "-",
  "-filter_complex",
  "[0:v][1:v]overlay[o];[o]scale=1080:-2:flags=bicubic[out]",
  "-map",
  "[out]",
  "-c:v",
  "libx264",
  "-profile:v",
  "main",
  "-preset",
  "medium",
  "-crf",
  "20",
  "-movflags",
  "faststart",
  "-pix_fmt",
  "yuv420p",
  "-r",
  "25",
  "-frames:v",
  "175",
  "/Users/tk/projects/lottie-to-mp4/files/xv-DIcVz0rYPZjXalgrnzmkPbqHLe9_generated.mp4"
]


  


  Works in local machine (MAC)
Doesn't work in docker.

  


  After ffmpeg finishes I make a log

  


  fs.statSync(videoFilePath).size


  


  In local the log gives 3286531, but in docker it's alway 48.

  


  I create path to video like this :

  


  const relevantPath = "../../files";    
const videoFilePath = path.resolve(__dirname, relevantPath, `${ generatedFileName }_generated.mp4`);


  


• How can I avoid the 'ffmpeg was killed with signal SIGSEGV' error with fluent-ffmpeg on my Ubuntu server ? [closed]

  30 mai 2023, par golden llama

  ffmpeg was killed with signal SIGSEGV (using fluent-ffmpeg in nodejs on ubuntu)

  


  I am expecting ffmpeg to take a provided url and timestamps, then trim the video down. Once that happens I want it to output the video to the same directory as the code so my other code can work with it !

  


  problem is that on .saveToFile I get the
ffmpeg was killed with signal SIGSEGV
error. Im running an ubuntu server on a local machine on my local network.

  


  ffmpeg() .input(url) .outputOptions('-ss', timeSTART, '-to', timeEND) .saveToFile(vidID) .on('progress', (progress) => { if (progress.percent) { // console.log(process.memoryUsage.toString()); console.log(`Processing: ${Math.floor(progress.percent)}% done`); } })