Recherche avancée

Sur d’autres sites (4698)

• Revision d9655e42b8 : Change in rddiv parameter to make it a power of 2 Converts the constant rddiv p

  11 octobre 2013, par Deb Mukherjee

  Changed Paths :
   Modify /vp9/encoder/vp9_rdopt.c

  
   Modify /vp9/encoder/vp9_rdopt.h

  
  
  Change in rddiv parameter to make it a power of 2

  Converts the constant rddiv parameter to 128 (from 100) and
  implements RDCOST with bit-shift rather than multiplication.
  Other parameters are also adjusted to roughly keep the same
  balance between Rate and Distortion.

  There is a slight speed-up of about 0.5-1% (at speed 0) as
  testted on football_cif.

  There is a slight change in performance due to small change
  in the parameters.
  derfraw300 : +0.033%
  stdhdraw250 ; +0.102%

  Change-Id : I70ac69f58fa71c83108f68fe41796cd19d1fc760

• Can't upload folder with large amount of files to google storage. I using "@ffmpeg-installer/ffmpeg" and @google-cloud/storage

  20 juillet 2022, par Dmytro

  I upload file to google storage using "@ffmpeg-installer/ffmpeg" and @google-cloud/storage in my node.js App.
Step 1. file uploading to fs is in child processes - one process for each type of resolution (totaly six).
step 2. encription (converting to stream)
step 3. upload to google storage

  


  I use "Upload a directory to a bucket" in order to send the video from the client to the Google Cloud Storage bucket.

  


  This way is working fine only with small video.

  


  for example when I upload video with duration one hour it split on chunk and totally I get more three thousands files. But the problem occurs when there are more than 1500 files

  


  So actually i upload folder with large amount of files, but not all of this files are uploaded to cloud.

  


  maybe someone had the similar problem and helps fix it.

  


  


  


  const uploadFolder = async (bucketName, directoryPath, socketInstance) => {
    try {
      let dirCtr = 1;
      let itemCtr = 0;
      const fileList = [];

      const onComplete = async () => {
        const folderName = nanoid(46);

        await Promise.all(
          fileList.map(filePath => {
            const fileName = path.relative(directoryPath, filePath);
            const destination = `${ folderName }/${ fileName }`;

            return storage
              .bucket(bucketName)
              .upload(filePath, { destination })
              .then(
                uploadResp => ({ fileName: destination, status: uploadResp[0] }),
                err => ({ fileName: destination, response: err })
              );
          })
        );

        if (socketInstance) socketInstance.emit('uploadProgress', {
          message: `Added files to Google bucket`,
          last: false,
          part: false
        });

        return folderName;
      };

      const getFiles = async directory => {
        const items = await fs.readdir(directory);
        dirCtr--;
        itemCtr += items.length;
        for(const item of items) {
          const fullPath = path.join(directory, item);
          const stat = await fs.stat(fullPath);
          itemCtr--;
          if (stat.isFile()) {
            fileList.push(fullPath);
          } else if (stat.isDirectory()) {
            dirCtr++;
            await getFiles(fullPath);
          }
        }
      }

      await getFiles(directoryPath);

      return onComplete();
    } catch (e) {
      log.error(e.message);
      throw new Error('Can\'t store folder.');
    }
  };

  


  


  



• How with ffmpeg one char with different color ?

  1er juin 2017, par Fatas

  How to ffmpeg one char with different color ?

  I have draw text with ffmpeg, but I can’t find how I can change only one character’s color. All text I can change, but I need one char with a different color.

  I have this part of code :

     ffmpeg -f lavfi \
  
      -i color=c=white:s=1280x720 \
  
      -vf "drawtext=text='aaaaaaaaBaaaaa':\
  
      fontcolor=black:\
  
      fontsize=24:\"
  
      -pix_fmt yuv420p -t 30 -y out.mp4 ");

  But I can’t figure out how need change letter B to red