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• PHP FFMPEG command not working and working in terminal

  1er mars 2019, par Saurabh Sharma

  My FFMPEG path /usr/bin/ffmpeg
  My FFMPEG command

  $result = exec('/usr/bin/ffmpeg -i 1551361268_video.webm -i 
  
   1551361289_video.webm -i 1551361500_video.webm -i 1551361518_video.webm -i 
  
   1551361555_video.webm -i 1551361626_video.webm -i 1551361647_video.webm -i 
  
    1551361682_video.webm \
  
   -filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0][2:v:0][2:a:0][3:v:0][3:a:0] 
  
   [4:v:0][4:a:0][5:v:0][5:a:0][6:v:0][6:a:0][7:v:0] 
  
   [7:a:0]concat=n=8:v=1:a=1[outv][outa]" \
  
   -map "[outv]" -map "[outa]" php.mkv');

  When I run this code nothing happens. I’m using centos 7. If I run this command on terminal, This works fine.

• I'm attempting to retrieve the dimensions of in-memory video buffer objects in Node.js without writing to disk

  23 mars 2021, par undefined

  All right, so I have a Node.js server where media files can be uploaded by the user. It's important for displaying the media in the client later on that I can retrieve and store the width and height dimensions of the video in advance.

  


  For performance reasons, disk space limitations, and a few other reasons, I'm attempting to do so without saving the video buffer object (retrieved via Multer) to disk as it has terrible performance on the server I am using.

  


  I have FFmpeg and ffprobe, as well as the nom get-video-dimensions module, but I can't find a way to get media statistics without writing the file. For example, get-video-dimensions only allows you to enter a file path.

  


  Is there a way to either feed the buffer into one of these utilities using either a stream/pipe to simulate the source coming from disk, or is there an rpm module I've overlooked that could achieve this task ?

  


  if (imageBufferObject.media_type == "video") {
  // Get resolution

  // Save to disk
  let write_response = await writeFile(imageBufferObject)
  // Use utility
  let dim = await dimensions(path.join(__dirname, 'tmp', newName))
  // Delete file
  let delete_response = await deleteFile(imageBufferObject)


   async function writeFile(file){
     return new Promise((resolve, reject)=>{
       fs.writeFile(path.join(__dirname, 'tmp', file.newName), file.buffer, (err)=>{
         resolve(200)
        })
     })
   }
   async function deleteFile(file){
     return new Promise((resolve, reject)=>{
       fs.unlink(path.join(__dirname, 'tmp', file.newName), (err)=>{
         resolve(200)
       })
     })
   }


  


  I desperately want to avoid using the hard disk !

  


• How to retrieve FFMPEG (called from OpenCV) Python decoding error

  15 décembre 2020, par user9784065

  While trying to read a video stream form an IP camera using :

  



  stream = cv2.VideoCapture(src)
(grabbed, frame) = stream.read()


  



  The grabbed returns True while sometimes the frames are corrupted (probably due to high CPU load). An internal Opencv error like the following is showing on the terminal :

  



  [h264 @ 0x25e99400] error while decoding MB 87 29, bytestream -5


  



  Is there a way to catch this error ? Please note that I tried the obvious try:except with cv2.error etc. In such case of corrupted frame it would be preferable to restart the connection to the camera.