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• How to Correctly Implement ffmpeg Complex Filters in Node.js for Image Processing ?

  24 janvier 2024, par Luke

  Problem :

  


  I am trying to add filters and transitions between my image slideshow array, and am struggling to apply the proper filters. For example, I get errors like this :

  


  {&#xA;  "errorType": "Error",&#xA;  "errorMessage": "ffmpeg exited with code 234: Failed to set value &#x27;fade=type=in:start_time=0:duration=1,zoompan=z=zoom&#x2B;0.002:d=120:x=if(gte(zoom,1.2),x,x&#x2B;1):y=if(gte(zoom,1.2),y,y&#x2B;1)&#x27; for option &#x27;filter_complex&#x27;: Invalid argument\nError parsing global options: Invalid argument\n",&#xA;  "trace": [&#xA;    "Error: ffmpeg exited with code 234: Failed to set value &#x27;fade=type=in:start_time=0:duration=1,zoompan=z=zoom&#x2B;0.002:d=120:x=if(gte(zoom,1.2),x,x&#x2B;1):y=if(gte(zoom,1.2),y,y&#x2B;1)&#x27; for option &#x27;filter_complex&#x27;: Invalid argument",&#xA;    "Error parsing global options: Invalid argument",&#xA;    "",&#xA;    "    at ChildProcess.<anonymous> (/opt/nodejs/node_modules/fluent-ffmpeg/lib/processor.js:182:22)",&#xA;    "    at ChildProcess.emit (node:events:517:28)",&#xA;    "    at ChildProcess._handle.onexit (node:internal/child_process:292:12)"&#xA;  ]&#xA;}&#xA;</anonymous>

  


  Lambda Function Code :

  


   async function concat(bucketName, imageKeys) {
      const imageStreams = await Promise.all(
        imageKeys.map(async (key, i) => {
          const command = new GetObjectCommand({ Bucket: bucketName, Key: key });
          const response = await s3.send(command);
          // Define the temporary file path based on the index
          const tempFilePath = `/tmp/${i}.png`;
    
          // Write the image data to the temporary file
          await fs.writeFile(tempFilePath, response.Body);
    
          // Return the file path to be used later
          return tempFilePath;
        })
      );
    
      // Create a file list content with durations
      let fileContent = "";
      for (let i = 0; i < imageStreams.length; i++) {
        fileContent += `file '${imageStreams[i]}'\nduration 1\n`;
    
        // Check if it's the last image, and if so, add it again
        if (i === imageStreams.length - 1) {
          fileContent += `file '${imageStreams[i]}'\nduration 1\n`;
        }
      }
    
      // Define the file path for the file list
      const fileListPath = "/tmp/file_list.txt";
    
      // Write the file list content to the file
      await fs.writeFile(fileListPath, fileContent);
    
      try {
        await fs.writeFile(fileListPath, fileContent);
      } catch (error) {
        console.error("Error writing file list:", error);
        throw error;
      }
    
      // Create a complex filter to add zooms and pans
      // Simplified filter example
  let complexFilter = [
    // Example of a fade transition
    {
      filter: 'fade',
      options: { type: 'in', start_time: 0, duration: 1 },
      inputs: '0:v', // first video stream
      outputs: 'fade0'
    },
    // Example of dynamic zoompan
    {
      filter: 'zoompan',
      options: {
        z: 'zoom+0.002',
        d: 120, // duration for this image
        x: 'if(gte(zoom,1.2),x,x+1)', // dynamic x position
        y: 'if(gte(zoom,1.2),y,y+1)' // dynamic y position
      },
      inputs: 'fade0',
      outputs: 'zoom0'
    }
    // Continue adding filters for each image
  ];

  let filterString = complexFilter
    .map(
      (f) =>
        `${f.filter}=${Object.entries(f.options)
          .map(([key, value]) => `${key}=${value}`)
          .join(":")}`
    )
    .join(",");
    
      let filterString = complexFilter
        .map(
          (f) =>
            `${f.filter}=${Object.entries(f.options)
              .map(([key, value]) => `${key}=${value}`)
              .join(":")}`
        )
        .join(",");
    
      console.log("Filter String:", filterString);
    
      return new Promise((resolve, reject) => {
        ffmpeg()
          .input(fileListPath)
          .complexFilter(filterString)
          .inputOptions(["-f concat", "-safe 0"])
          .outputOptions("-c copy")
          .outputOptions("-c:v libx264")
          .outputOptions("-pix_fmt yuv420p")
          .outputOptions("-r 30")
          .on("end", () => {
            resolve();
          })
          .on("error", (err) => {
            console.error("Error during video concatenation:", err);
            reject(err);
          })
          .saveToFile("/tmp/output.mp4");
      });
    }


  


  Filter String Console Log :

  


  Filter String: fade=type=in:start_time=0:duration=1,zoompan=z=zoom+0.002:d=120:x=if(gte(zoom,1.2),x,x+1):y=if(gte(zoom,1.2),y,y+1)


  


  Questions :

  


  

  1. What is the correct syntax for implementing complex filters like zoompan and fade in ffmpeg when used in a Node.js environment ?

  


  2. How do I ensure the filters are applied correctly to each image in the sequence ?

  


  3. Is there a better way to dynamically generate these filters based on the number of images or their content ?

  


  


  Any insights or examples of correctly implementing this would be greatly appreciated !

  


• How To fix "PHP Fatal error : Class 'ffmpeg_movie' not found" Error in PHP

  19 janvier 2019, par Ajay Katariya

  I have installed FFMPEG in my server for video conversions into different sizes of videos within my WordPress site running on PHP 5.6/Linux. Previously all things were working fine but today suddenly I got one error like :

  "PHP Fatal error : Class ’ffmpeg_movie’ not found".

  PHP Warning : PHP Startup : Unable to load dynamic library ’/opt/cpanel/ea-php56/root/usr/lib64/php/modules/ffmpeg.so’ - /opt/cpanel/ea-php56/root/usr/lib64/php/modules/ffmpeg.so : cannot open shared object file : No such file or directory in Unknown on line 0

  I have searched solution for this error, so I got one solution like include autoload.php file. Which I have already included.

  So can anyone help me to solve out this problem ?

• Cleaning AVFrame properly

  12 septembre 2022, par Vencat

  I'm creating AVFrame object using av_frame_alloc() function and clearing it using av_frame_free(&frame) which internally calls av_frame_unref(), but it's not cleaning the memory properly. Heap size of my app grows exponentially in run time.

  



  Not working :

  



  AVFrame* frame = av_frame_alloc();
av_frame_free(&frame);


  



  Working :

  



  AVFrame* frame = av_frame_alloc();
av_free(frame->data[0]);


  



  As far as I know, av_frame_free() calls av_freep() which calls av_free() to free the dynamic memory. Memory gets cleaned, If I use av_free(frame->data[0]) directly instead of av_frame_free(&frame)