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• ac3enc : do not clip coefficients after transforms

  9 janvier 2021, par Lynne

  ac3enc : do not clip coefficients after transforms
  In either encoder, its impossible for the coefficients to go past 25 bits
  
  right after the MDCT. Our MDCT is numerically stable.
  
  For the floating point encoder, in case a NaN is contained, lrintf() will
  
  raise a floating point exception during the conversion.
  

  • [DH] libavcodec/ac3enc_template.c

• first few seconds of m3u8 clip isn't working, which is generated from another m3u8 file by node js

  13 janvier 2021, par Alan

  index.js

  


  
const ffmpegPath = require('@ffmpeg-installer/ffmpeg').path;
const ffmpeg = require('fluent-ffmpeg');
const process = require('process');


const args = process.argv.slice(2);
if (args.length !== 4) {
    console.error('Incorrect number of arguments');
    process.exit(1);
  }
const startTime = args[0];
const timeDuration = args[1];
const inputFile = args[2];
const outputFile=args[3];

ffmpeg.setFfmpegPath(ffmpegPath);

ffmpeg(inputFile)
  .setStartTime(startTime)
  .setDuration(timeDuration)
  .output(outputFile)
  .outputOptions('-hls_list_size 0')
  .on('end', function(err) {
    if(!err) { console.log('conversion Done') }
  })
  .on('error', function(err){
    console.log('error: ', err)
  }).run();



  


  


  Here is my code which I'm using to create a clip m3u8 formatted file from another m3u8 file. I'm using this command on the terminal to generate it.
Here is the command

  


  node index.js 5 40 ../path/input.m3u8 ../path/output.m3u8

  


  so here 5 is the starting time and 40 is the duration in seconds.
The issue is the first ts file it's generating (for example output_test0.ts) isn't working as it should. It's getting generated in kb format while the others in MB format. So when I play the new m3u8 file, the first 3-5 seconds clip is a static pic but other than that everything works fine.
Here is a link to the m3u8 file. https://mp4.to/downloads/0cb552cd749c4cf4b

  


  


  


  

  


  


  


  As you can see the first output_test0.ts file isn't like others. Other output ts files are in MB while the first one only in kb and this case been happening with the first file only. Any command input I'm missing ? need help.

  


  


• full m3u8 clip isn't getting generated from m3u8 file by node.js

  13 janvier 2021, par Alan

  index.js

  


  const ffmpegPath = require('@ffmpeg-installer/ffmpeg').path;
const ffmpeg = require('fluent-ffmpeg');
const process = require('process');

const args = process.argv.slice(2);
if (args.length !== 4) {
  console.error('Incorrect number of arguments');
  process.exit(1);
}

const startTime = args[0];
const timeDuration = args[1];
const inputFile = args[2];
const outputFile=args[3];

ffmpeg.setFfmpegPath(ffmpegPath);

ffmpeg(inputFile)
  .setStartTime(startTime)
  .setDuration(timeDuration)
  .output(outputFile)
  .on('end', function(err) {
    if(!err) { 
      console.log('conversion Done') 
    }
  })
  .on('error', function(err){
    console.log('error: ', err)
  }).run();


  


  I am running this command on the terminal to generate a clip from the m3u8 file
node index.js 00:00:10 46 ./path/sample.m3u8 ./path/output.m3u8

  


  The main problem is that it is not creating a clip for more than 13 seconds. For example, the above command should generate a 46s clip but it is going near 13 seconds. So I don't get what is the issue. Any clip less than 13 works perfectly fine. Is there any way to fix that ?

  


  Here is a link to the m3u8 file https://mp4.to/downloads/0cb552cd749c4cf4b