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• tools/target_dec_fuzzer : Sort threshold list alphabetically

  26 janvier 2020, par Michael Niedermayer

  tools/target_dec_fuzzer : Sort threshold list alphabetically
  This also removes the comments as they are hard to maintain
  
  together with sorted lists
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] tools/target_dec_fuzzer.c

• how the packuswb instruction works ? (in low level bit operation)

  17 avril 2019, par MaikonNascimento

  Studying ffmpeg convertion from yuv to rgb , I came across the equation being implemented in assembly, yuv2rgb_template.c located in ffmpeg/libswscale/x86.

  I want to know how the instruction packuswb works ? Google says it :

  Converts 4 signed word integers from mm and 4 signed word integers from mm/m64 into 8 unsigned byte integers in mm using unsigned saturation.

      DEST[7:0] ← SaturateSignedWordToUnsignedByte DEST[15:0];
  
      DEST[15:8] ← SaturateSignedWordToUnsignedByte DEST[31:16];
  
      DEST[23:16] ← SaturateSignedWordToUnsignedByte DEST[47:32];
  
      DEST[31:24] ← SaturateSignedWordToUnsignedByte DEST[63:48];
  
      DEST[39:32] ← SaturateSignedWordToUnsignedByte SRC[15:0];
  
      DEST[47:40] ← SaturateSignedWordToUnsignedByte SRC[31:16];
  
      DEST[55:48] ← SaturateSignedWordToUnsignedByte SRC[47:32];
  
      DEST[63:56] ← SaturateSignedWordToUnsignedByte SRC[63:48];

  Since I dont know Assembly x86, it is even hard to simulate it or debug the current code.

  I want to know how they fit 16 bits in 8 bits ?

• How to pipe multiple files to ffmpeg ?

  14 août 2013, par Olung

  I am trying to make a bash script that searches all subfolders on given path for .mov files and converts them with ffmpeg and outputs them in an destination folder, keeping the clip name.

  I'm very new to scripting and I'm having a hard time finding out how to solve this.

  So far I've tried using ls and find to output the filepaths, but have no idea how to pipe this to ffmpeg in the right way.

  Any clues ?

  Edit :

  got some sucess with this :

  #!/bin/bash
  
  
  
  echo "drop source folder: "
  
  read source
  
  
  
  echo "drop destination folder: "
  
  read des
  
  
  
  find "$source" -name '*.mov' -exec sh -c 'ffmpeg -i "$0" -vcodec prores -profile:v 0 -an "$des/${0%%.mov}.mov"' {} \;
  
  exit;

  but, the it seems to output to the source folder asking for a overwrite. How can i setup the parameters correctly so it outputs to the "destination folder" and keeps the filenames ?