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• pixfmt : Add ARIB STD-B76 color transfer characteristic

  15 juin 2016, par Neil Birkbeck

  pixfmt : Add ARIB STD-B76 color transfer characteristic
  Adding hybrid log-gamma (https://en.wikipedia.org/wiki/Hybrid_Log-Gamma)
  
  based on the standardization in ARIB STD-B67 :
  
  http://www.arib.or.jp/english/html/overview/doc/2-STD-B67v1_0.pdf
  The choice of enum value of 18 is consistent with HEVC :
  
  http://phenix.it-sudparis.eu/jct/doc_end_user/current_document.php?id=10481
  And also with latest proposal for color format in mkv :
  
  https://mailarchive.ietf.org/arch/search/?email_list=cellar&gbt=1&q=Colour+Format+proposal
  Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>
  

  • [DBH] libavcodec/options_table.h
  • [DBH] libavcodec/version.h
  • [DBH] libavutil/pixdesc.c
  • [DBH] libavutil/pixfmt.h
  • [DBH] libavutil/version.h

• lavu : Adding ARIB STD-B67 (hybrid log-gamma) enum value and transfer function.

  21 avril 2016, par Neil Birkbeck

  lavu : Adding ARIB STD-B67 (hybrid log-gamma) enum value and transfer function.
  Adding hybrid log-gamma (https://en.wikipedia.org/wiki/Hybrid_Log-Gamma)
  
  based on the standardization in ARIB STD-B67 :
  
  http://www.arib.or.jp/english/html/overview/doc/2-STD-B67v1_0.pdf
  The choice of enum value of 18 is consistent with HEVC :
  
  http://phenix.it-sudparis.eu/jct/doc_end_user/current_document.php?id=10481
  And also with latest proposal for color format in mkv :
  
  https://mailarchive.ietf.org/arch/search/?email_list=cellar&gbt=1&q=Colour+Format+proposal
  The implementation assumes a nominal input range of [0, 1], which is
  
  consistent with HEVC.
  Signed-off-by : Neil Birkbeck <neil.birkbeck@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavutil/color_utils.c
  • [DH] libavutil/pixdesc.c
  • [DH] libavutil/pixfmt.h
  • [DH] tests/ref/fate/color_utils

• Remove comma from ffmpeg output in AWS Lambda layer

  8 mars 2019, par Gracie

  I am using the ffmpeg Lambda layer to get the duration and channels from an audio file. I am then outputting these details to variables to use later in my code ?

  Can anyone spot/tidy this code so it only outputs the actual value and not one prepended with a comma

  

  const { spawnSync } = require("child_process");
  
  var fs = require('fs');
  
  const https = require('https');
  
  
  
  
  
  exports.handler = async (event) => {
  
      const source_url = 'https://upload.wikimedia.org/wikipedia/commons/b/b2/Bell-ring.flac';
  
      const target_path = '/tmp/test.flac';
  
  
  
      async function downloadFile()  {
  
          return new Promise((resolve, reject) => {
  
              const file = fs.createWriteStream(target_path);
  
              const request = https.get(source_url, function(response) {
  
              response.pipe(file);
  
              console.log('file_downloaded!');
  
              resolve();
  
              });
  
          });
  
      }
  
  
  
      await downloadFile();
  
  
  
      const duration = spawnSync(
  
          "/opt/bin/ffprobe",
  
          [
  
              target_path,
  
              "-show_entries",
  
              "stream=duration", 
  
              "-select_streams",
  
              "a",
  
              "-of",
  
              "compact=p=0:nk=1",
  
              "-v",
  
              "0"
  
          ]
  
          );
  
  
  
          const channel = spawnSync(
  
          "/opt/bin/ffprobe",
  
          [
  
              target_path,
  
              "-show_entries",
  
              "stream=channels",
  
              "-select_streams",
  
              "a",
  
              "-of",
  
              "compact=p=0:nk=1",
  
              "-v",
  
              "0"
  
          ]
  
          );
  
  
  
      var durations = duration.output.toString('utf8');
  
      console.log(durations);
  
      var channels = channel.output.toString('utf8');
  
      console.log(channels);
  
  
  
      /*const response = {
  
          statusCode: 200,
  
          //body: JSON.stringify([channel.output.toString('utf8')])
  
          body: 'Complete'
  
      };
  
      return response;*/
  
  };

  Just not sure where these comma values are coming from and I need these as number values for comparison functions later in the code.

  It uses this easy Lambda layer with no external modules required

  https://github.com/serverlesspub/ffmpeg-aws-lambda-layer