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• FFMPEG FTP is not working

  16 mai 2014, par SENTHIL SARAVANAN

  I want convert video files using FFMPEG and upload into my server using FTP. For this i used the following ffmpeg command

  ffmpeg -i C:\Users\sen\Desktop\sss\input.mov ftp://root:xxxxxxxxxxx@xxx.xxx.xxx.24/output.flv

  But ffmpeg shows like authentication failed, i hope i give valid server credentials only. Please refer the ffmpeg screen for more detail

  How can solve this issue.

• How can I change the length of my ffmpeg video ? The concatenation is not working

  24 janvier 2024, par Luke

  I am trying to use the ffmpeg library whereby I take three images, and make a 9 second video of them. However, it is just showing the first video for three seconds, then finishing. What in my code do I need to change ? The code uses AWS Lambda to store the files in temporary storage. I've logged everything before, and it all seems to be working. I have a feeling it is this line of code that is not working : .outputOptions(["-c:v libx264", "-t 12", "-pix_fmt yuv420p", "-vf scale=1280:720", "-r 1"]) combined with the concatenation process.

  


  async function processImages(imageStreams) {
  for (let i = 0; i < imageStreams.length; i++) {
    await processSingleImage(imageStreams[i], `/tmp/temp_video_${i}.mp4`, i);
  }
  await concatenateVideos(imageStreams.length);
}


async function processSingleImage(imageStream, outputPath, index) {
  return new Promise((resolve, reject) => {
    const command = ffmpeg(imageStream);
    command
      .outputOptions(["-c:v libx264", "-t 12", "-pix_fmt yuv420p", "-vf scale=1280:720", "-r 1"])
      .on("end", () => {
        resolve();
      })
      .on("error", (err) => {
        console.error(`Error during processing of image ${index}:`, err);
        reject(err);
      })
      .saveToFile(outputPath);
  });
}

async function concatenateVideos(numberOfVideos) {
  const fileList = "/tmp/file_list.txt";
  let fileContent = "";
  for (let i = 0; i < numberOfVideos; i++) {
    fileContent += `file '/tmp/temp_video_${i}.mp4'\n`;
  }

  await fs.writeFile(fileList, fileContent);

  return new Promise((resolve, reject) => {
    ffmpeg()
      .input(fileList)
      .inputOptions(["-f concat", "-safe 0"])
      .outputOptions(["-c copy"])
      .saveToFile("/tmp/output.mp4");
  });
}


  


• VideoCapture is not working in OpenCV 2.4.2

  31 mai 2016, par Froyo

  I recently installed OpenCV 2.4.2 in Ubuntu 12.04.

  cap = VideoCapture(0)

  is working. but I can’t grab frames from some video source.

  cap = VideoCapture("input.avi")
  
  img = cap.read() 

  gives me a numpy with all zero elements.

  I have also installed ffmpeg 0.11, Latest snapshot of x264, v4l-0.8.8 (All are latest stable versions)

  cmake -D WITH_QT=ON -D WITH_FFMPEG=ON -D WITH_OPENGL=ON -D WITH_TBB=ON -D BUILD_EXAMPLES=OFF WITH_V4L=ON .. 
  
  make
  
  sudo make install

  When I do cmake, I get this

  — Detected version of GNU GCC : 46 (406)
  — Found OpenEXR : /usr/lib/libIlmImf.so
  — Looking for linux/videodev.h
  — Looking for linux/videodev.h - not found
  — Looking for linux/videodev2.h
  — Looking for linux/videodev2.h - found
  — Looking for libavformat/avformat.h
  — Looking for libavformat/avformat.h - found
  — Looking for ffmpeg/avformat.h
  — Looking for ffmpeg/avformat.h - not found
  — checking for module ’tbb’
  — package ’tbb’ not found

  And

  --   Video I/O:  
  
  --     DC1394 1.x:                  NO  
  
  --     DC1394 2.x:                  YES (ver 2.2.0)  
  
  --     FFMPEG:                      YES  
  
  --       codec:                     YES (ver 54.23.100)  
  
  --       format:                    YES (ver 54.6.100)  
  
  --       util:                      YES (ver 51.54.100)  
  
  --       swscale:                   YES (ver 2.1.100)  
  
  --       gentoo-style:              YES  
  
  --     GStreamer:                   
  
  --       base:                      YES (ver 0.10.36)  
  
  --       app:                       YES (ver 0.10.36)  
  
  --       video:                     YES (ver 0.10.36)  
  
  --     OpenNI:                      NO  
  
  --     OpenNI PrimeSensor Modules:  NO  
  
  --     PvAPI:                       NO  
  
  --     UniCap:                      NO  
  
  --     UniCap ucil:                 NO  
  
  --     V4L/V4L2:                    Using libv4l (ver 0.8.8)  
  
  --     XIMEA:                       NO  
  
  --     Xine:                        NO

  I looked for videodev.h, etc

  • /usr/include/linux/videodev2.h exists
  • /usr/include/libavformat/avformat.h exists
  • /usr/local/include/libavformat/avformat.h exists

  But I couldn’t find ffmpeg/avformat.h

  What’s the problem here ?