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• FFmpeg trim filter fails to use sexagisimal time specification and the output stream is empty. Is it a bug and is there a fix ?

  29 novembre 2020, par Link-akro

  With ffmpeg the trim filter (or its audio variant atrim) malfunctions whenever i try to write a sexagesimal time specification for the boundaries or duration parameters of the filter : the result is always an empty stream.

  


  According to the documentation i already linked, which was generated on November 26, 2020 so far, the time duration specification should be supported.

  


  


  start, end, and duration are expressed as time duration specifications

  


  


  Quote of the spec.

  


  


  [-][HH :]MM:SS[.m...]

  


  


  


  [-]S+[.m...][s|ms|us]

  


  


  I am working in a Windows_10-64bit and scripting in its CMD.exe command-line, should it matter.

  


  Here is an instance of trimming a video stream out of a media file with hardcoded value for simplicity. The audio is retained unless i use atrim as well.
We may or may not append the setpts filter as recommended in the documentation henceforth setpts=PTS-STARTPTS if we want to shift the stream to start at the beginning of the cut range.

  


      ffmpeg -i sample-counter.mp4 -vf "trim=start=start='1:2':end='1:5'" sample-counter-trimmed.mp4


  


  If i use decimal it works as intended.

  


      ffmpeg -i sample-counter.mp4 -vf "trim=start=start='2':end='5'" sample-counter-trimmed.mp4


  


  This is the banner of my ffmpeg build. We may see it is the latest build by gyan.dev at the moment i post this.

  


      ffmpeg version 4.3.1-2020-11-19-full_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
      built with gcc 10.2.0 (Rev5, Built by MSYS2 project)
      configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint


  


  The incorrect stream is always reported as 0kB weight in the output of ffmpeg. I confirmed with ffprobe Movie_Countdown-trim-2-5.mov -show_streams -show_entries format=duration that the incorrect stream is duration zero.

  


  Should i report it as a bug ? Is there some correction or workaround ?

  


  I would rather a solution with the trim filter itself, but if not possible a CMD batch scripting.
We should not need a different filter like select or seeking option like there are tutorials and questions/answers everywhere already. Scripting would be straight-forward in a proper *nix shell+distrib and taught everywhere so it is not worth caring while CMD answers on the other hand are rare so a scripting workaround for CMD would have some microcosmic worth since making one is considerably less straight-forward than a shell with modern mathematics and parsing abilities built-in or packaged.

  


• Anomalie #4799 (Nouveau) : Validité du RSS

  26 mai 2021

  Marc, sur https://discuter.spip.net/t/rss-atom-enclosures-et-w3c/152922 signale quelques points de validité à améliorer sur le RSS de la dist

  backend.html¶

  • balise rss : rajout d’un lien xmlns:atom="http://www.w3.org/2005/Atom"
  • balise channel : rajout de
  • réf : Missing atom:link with rel="self"

  squelette rss-item.html (ou inc-rss.html)¶

  • enclosures multiples : item contains more than one enclosure
  • suggestion (discutable) rajouter un critère {0,1} dans la boucle document de rss-item.html

  <span class="CodeRay">
  
  <span class="tag">span><span class="error">(</span><span class="attribute-name">DOCUMENTS</span><span class="error">)</span><span class="error">{</span><span class="attribute-name">id_article</span><span class="error">}</span><span class="error">{</span><span class="attribute-name">mode</span>=<span class="attribute-value">document</span><span class="error">}</span><span class="error">{</span><span class="attribute-name">doublons</span><span class="error">}</span><span class="error">{</span><span class="attribute-name">0</span><span class="error">,</span><span class="attribute-name">1</span><span class="error">}</span><span class="tag">></span>[
  
  <span class="tag">span> <span class="attribute-name">url</span>=<span class="string"><span class="delimiter">"</span><span class="content">(#URL_DOCUMENT|url_absolue|unique)</span><span class="delimiter">"</span></span><span class="error">[</span> <span class="attribute-name">length</span>=<span class="string"><span class="delimiter">"</span><span class="content">(#TAILLE)</span><span class="delimiter">"</span></span><span class="error">]</span><span class="error">[</span> <span class="attribute-name">type</span>=<span class="string"><span class="delimiter">"</span><span class="content">(#MIME_TYPE)</span><span class="delimiter">"</span></span><span class="error">]</span> <span class="tag">/></span>]
  
  <span class="tag"></span>
  
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• Problem importing whatsapp-web.js nodejs module in electron react app

  26 mai 2021, par Sunil Shah

  I am trying to build an electron react app. I need to integrate this node modules https://www.npmjs.com/package/whatsapp-web.js in my electron react app. My main.js of electron looks like this :

  


  


  


  // Modules to control application life and create native browser window
const { app, BrowserWindow } = require("electron");
const path = require("path");

function createWindow() {
  // Create the browser window.
  const mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      webSecurity: false,
    },
  });

  // and load the index.html of the app.
  mainWindow.loadURL("your ip address:3000");

  // Open the DevTools.
  // mainWindow.webContents.openDevTools()
}

app.whenReady().then(() => {
  createWindow();

  app.on("activate", function () {
    // On macOS it's common to re-create a window in the app when the
    // dock icon is clicked and there are no other windows open.
    if (BrowserWindow.getAllWindows().length === 0) createWindow();
  });
});

// Quit when all windows are closed, except on macOS. There, it's common
// for applications and their menu bar to stay active until the user quits
// explicitly with Cmd + Q.
app.on("window-all-closed", function () {
  if (process.platform !== "darwin") app.quit();
});

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.

  


  


  



  And the React code where i want to import whatsapp-web.js module looks like

  


  


  


  import React from "react";&#xA;import styled from "styled-components";&#xA;const qrcode = require(&#x27;qrcode-terminal&#x27;);&#xA;const Client = require(&#x27;whatsapp-web.js&#x27;);&#xA;function Error() {&#xA;  var client = new Client();&#xA;  client.initialize();&#xA;  console.log(client);&#xA;  console.log(qrcode);&#xA;  return (&#xA;    <container>&#xA;      <errorimage src="https://cdn4.iconfinder.com/data/icons/smiley-vol-3-2/48/134-512.png"></errorimage>&#xA;      <errormessage>Oops, you are not connected to any number.</errormessage>&#xA;    </container>&#xA;  );&#xA;}&#xA;&#xA;export default Error;&#xA;&#xA;const Container = styled.div`&#xA;  display: flex;&#xA;  height: 100vh;&#xA;  width: 100%;&#xA;  padding-top: 20vh;&#xA;  position: center;&#xA;  /* align-items: center; */&#xA;  justify-content: center;&#xA;`;&#xA;&#xA;const ErrorImage = styled.img`&#xA;  background-color: transparent;&#xA;  background-repeat: no-repeat;&#xA;  background-size: cover;&#xA;  object-fit: contain;&#xA;&#xA;  width: 25%;&#xA;  height: 25%;&#xA;&#xA;  /* border: 2px solid black; */&#xA;`;&#xA;&#xA;const ErrorMessage = styled.div`&#xA;  margin: 10px;&#xA;  width: 50%;&#xA;  height: 25%;&#xA;  /* top: 20px; */&#xA;  font-size: 30px;&#xA;  align-items: center;&#xA;  font-family: "Lucida Console", "Courier New", monospace;&#xA;  /* font-weight: bold; */&#xA;`;

  


  


  



  Now everytime I try to import const Client = require('whatsapp-web.js') It throws error like this :
**
[0] ./node_modules/fluent-ffmpeg/index.js
[0] Module not found : Can't resolve './lib-cov/fluent-ffmpeg' in 'D :\Sunil\Zarir_app-main\Zarir_app-main\node_modules\fluent-ffmpeg'
[0] Compiling...
[0] Failed to compile.

  


  and I tried the solution
https://github.com/fluent-ffmpeg/node-fluent-ffmpeg/issues/573#issuecomment-305408048
and other resources but still nothing works and just loops in errors and errors.
Please help if you have any information related to it.
Thank you.