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• Reason for write EPIPE error in my implentation ?

  18 mai 2019, par Chrisl446

  So I currently have a small node.js express application for uploading images using sharp & thumbnails created from .mp4 videos using simple-thumbnail package/ffmpeg.

  The app works perfectly when uploading an image, the file is uploaded sharp processes it, then passes it along and it ends up in my amazon s3 bucket as expected. No errors what so ever.

  However, when I upload an mp4 video that I use to create and upload a thumbnail from by using simple-thumbnails genThumbnail() function, which uses ffmpeg child process, the thumbnail uploads successully to my s3 bucket, HOWEVER my app returns an EPIPE write error and NOT the url of the uploaded files url on S3.

  What is causing this and how can I fix it, considering it’s pretty much working aside from the EPIPE error that is being returned ? Thanks ahead !

  The packages of concern used are as follows :

  aws-sdk

  multer

  multer-s3 <- this one with the transform option, not the standard multer-s3 package

  simple-thumbnail

  const express = require('express');
  
  const app = express();
  
  
  
  const aws = require('aws-sdk');
  
  const multer = require('multer');
  
  const multerS3 = require('multer-s3'); //github:gmenih341/multer-s3 version of multer-s3 with transform option
  
  const sharp = require('sharp');
  
  const genThumbnail = require('simple-thumbnail');
  
  
  
  app.use((req, res, next) => {
  
      res.header('Access-Control-Allow-Origin', '*');
  
      res.header('Access-Control-Allow-Headers', 'Orgin, X-Requested-With, Content-Type, Accept, Authorization');
  
      if (req.method === 'OPTIONS') {
  
          res.header('Access-Control-Allow-Methods', 'POST');
  
          return res.status(200).json({});
  
      }
  
      next();
  
  });
  
  
  
  let uniqueFileName;
  
  let s3BucketName = 'bucketname';
  
  
  
  let s3 = new aws.S3({
  
      accessKeyId: ACCESS_KEY,
  
      secretAccessKey: SECRET_KEY,
  
      Bucket: s3BucketName
  
  });
  
  
  
  let upload = multer({
  
      storage: multerS3({
  
          s3: s3,
  
          bucket: s3BucketName,
  
          acl: 'public-read',
  
          cacheControl: 'max-age=31536000',
  
          contentType: multerS3.AUTO_CONTENT_TYPE,
  
          shouldTransform: true,
  
          transforms: [{
  
              id: 'thumbnail',
  
              key: function (req, file, cb) {
  
                  uniqueFileName = Date.now().toString();
  
                  cb(null, uniqueFileName + '.jpg')
  
              },
  
              transform: function (req, file, cb) {
  
                  if (file.mimetype == 'video/mp4') {
  
                      //When using simple-thumbnails' getThumbnail() on an mp4 video it uploads succesfully to S3 but node returns EPIPE write error
  
                      cb(null, genThumbnail(null, null, '250x?'))
  
                  } else {
  
                      //When using sharp to resize an image this works perfectly and retuns the JSON below with the files S3 URL
  
                      cb(null, sharp().jpeg())
  
                  }
  
  
  
              }
  
          }]
  
      })
  
  });
  
  
  
  app.post('/upload', upload.array('theFile'), (req, res) => {
  
      res.json({
  
          fileS3Url: 'https://s3.amazonaws.com/'+ s3BucketName +'/' + uniqueFileName
  
      });
  
  });
  
  
  
  app.use((req, res, next) => {
  
      const error = new Error('Not found');
  
      error.status = 404;
  
      next(error);
  
  });
  
  
  
  app.use((error, req, res, next) => {
  
      res.status(error.status || 500);
  
      res.json({
  
          error: {
  
              message: error.message
  
          }
  
      });
  
  });
  
  
  
  module.exports = app;

• MP4Box / FFMPEG concat loses audio after first clip

  17 novembre 2017, par user1615343

  So I am certainly no expert when it comes to either of these tools, but I have a web-based project that’s executing commands on an Amazon Linux server to concatenate two video files that are uploaded.

  Both files are converted to mp4s first using FFMPEG, and those play perfectly in a browser after conversion :

  ffmpeg -i file1.mpg -c:v libx264 -crf 22 -c:a aac -strict -2 -movflags faststart file2.mp4

  Then, I attempt to combine these two resulting mp4s into a single mp4. I tried using FFMPEG to do this but to no avail. Switching to try MP4Box got me much closer : the videos are concatenated together, but the audio stops playing at the end of the first clip, and the second clip is silent.

  MP4Box -force-cat -keepsys -add file.mp4 -cat file2.mp4 out.mp4

  I’ve tried varying versions of the above command with no better results. Any input is greatly appreciated.

  EDIT : info on .mp4 files using

  ffmpeg -i file1.mp4 -i file2.mp4

  ffmpeg -i 1510189259715DogRunsintoGlassDoor_315a03a8e20acfc.mp4 -i
  1510189273549NewhouseMoonMoonneverseenstairsbeforefunnydog_285a03a8e6aab25.mp4

  ffmpeg version N-61041-g52a2138 Copyright (c) 2000-2014 the FFmpeg
  developers

  built on Mar 2 2014 05:45:04 with gcc 4.6 (Debian 4.6.3-1)

  configuration : —prefix=/root/ffmpeg-static/64bit
  —extra-cflags=’-I/root/ffmpeg-static/64bit/include -static’ —extra-ldflags=’-L/root/ffmpeg-static/64bit/lib -static’ —extra-libs=’-lxml2 -lexpat -lfreetype’ —enable-static —disable-shared —disable-ffserver —disable-doc —enable-bzlib —enable-zlib —enable-postproc —enable-runtime-cpudetect —enable-libx264 —enable-gpl —enable-libtheora —enable-libvorbis —enable-libmp3lame —enable-gray —enable-libass —enable-libfreetype —enable-libopenjpeg —enable-libspeex —enable-libvo-aacenc —enable-libvo-amrwbenc —enable-version3 —enable-libvpx

  libavutil 52. 66.100 / 52. 66.100

  libavcodec 55. 52.102 / 55. 52.102

  libavformat 55. 33.100 / 55. 33.100

  libavdevice 55. 10.100 / 55. 10.100

  libavfilter 4. 2.100 / 4. 2.100

  libswscale 2. 5.101 / 2. 5.101

  libswresample 0. 18.100 / 0. 18.100

  libpostproc 52. 3.100 / 52. 3.100

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
  ’1510189259715DogRunsintoGlassDoor_315a03a8e20acfc.mp4’ :

  Metadata :

  major_brand : isom

  minor_version : 512

  compatible_brands : isomiso2avc1mp41

  encoder : Lavf55.33.100

  Duration : 00:00:04.92, start : 0.023220, bitrate : 634 kb/s

  Stream #0:0(und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p,
  360x360 [SAR 1:1 DAR 1:1], 501 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  (default)

  Metadata :

  handler_name : VideoHandler

  Stream #0:1(und) : Audio : aac (mp4a / 0x6134706D), 44100 Hz, mono,
  fltp, 132 kb/s (default)

  Metadata :

  handler_name : SoundHandler

  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from
  ’1510189273549NewhouseMoonMoonneverseenstairsbeforefunnydog_285a03a8e6aab25.mp4’ :

  Metadata :

  major_brand : isom

  minor_version : 512

  compatible_brands : isomiso2avc1mp41

  encoder : Lavf55.33.100

  Duration : 00:00:18.79, start : 0.023220, bitrate : 455 kb/s

  Stream #1:0(und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p,
  362x360 [SAR 1:1 DAR 181:180], 320 kb/s, 29.94 fps, 29.94 tbr, 11976
  tbn, 59.88 tbc (default)

  Metadata :

  handler_name : VideoHandler

  Stream #1:1(eng) : Audio : aac (mp4a / 0x6134706D), 44100 Hz, stereo,
  fltp, 129 kb/s (default)

  Metadata :

  handler_name : SoundHandler

  At least one output file must be specified

• how to convert a video to wmv3 format on linux

  3 mai 2022, par Dan Erez

  I am looking for a way to convert a video from any format ( specifically mp4 if it matters ) to wmv3.

  &#xA;&#xA;

  I'll save you some time - ffmpeg can only read wmv3 and can't write it. There's a patch but it's from 2007 and I don't feel comfortable to rely on it. Unless someone has experience of it working and can vouch for it.

  &#xA;&#xA;

  common names for the same format = Windows Media Video v9, wmv9, wmv3, msmpeg4 v3, asf

  &#xA;