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• FFMPEG creating mp3 with "Junk" at the end

  13 juillet 2022, par Johnaras

  I have a web application which converts WebM files to mp3 using FFMPEG.js in the Client-Side. Once the mp3 conversion finishes, users are prompted to download their file.

  


  Lately, I realized that a lot of mp3 files which I tried to converted have a different duration value than the original WebM file. The duration is usually longer. For instance, a WebM file with duration of 2:16 gets converted to an mp3 file with a duration of 2:29. Once the player reaches at 2:16 it just goes back to the start.

  


  I have tried to open the file in Audacity but it keeps saying that this MP3 file seems to be "Malformed".

  


  I also tried to use MP3val and it says the file has junk at the end.

  


  Code Snippets :

  


  const worker = new Worker("/ffmpeg-worker-mp4.js");
import { fetchFile } from "@ffmpeg/ffmpeg"; // https://www.npmjs.com/package/@ffmpeg/ffmpeg

const convertSong = async (title, id, bitrate) => {
    setProgress("Initializing...")
    ffmpegVars = [title]
    
    worker.postMessage({
      type: "run",
      arguments: ["-i", `input.webm`, "-c:a", "libmp3lame",  "-vn", "-ab", `${bitrate ? bitrate : 256}k`, "-ar", "44100", "-f", "mp3", `output.mp3`],
      MEMFS: [{ name: "input.webm", data: await fetchFile(`/api/download/stream?video=${id}`) }]
    });
}

convertSong(data.title, data.id, data.bitrate)


  


  I'm literally willing to pay anyone who helps me fix this.

  


• How to "extend" aws docker base image (.net core from scratch) by ... libs/ubuntu/ffmpeg ?

  26 avril 2022, par Nigrimmist

  i would like to use AWS Lambda through the image containers using .net core 3.1 and it is works fine for me in simplest code case. But i stucked with next scenario :

  


  By default, aws provide base image with .net core with aws libs based on "from scratch". So as i know, it minimal Linux that does not contains even package manager.

  


  I need to work with ffmpeg in the code, but to do it i need to install few packages and ... fmpeg. I have working code on image

  


  FROM mcr.microsoft.com/dotnet/runtime:3.1-bionic


  


  It is ubuntu with .net core runtime. But what is the right strategic in case of AWS Lambda image ? How can i ... merge them ?.

  


  Have few ideas, but not sure :

  


  

  1. use as is FROM public.ecr.aws/lambda/dotnet:core3.1 and try to install package manager, all depenendencies to use ffmpeg and so on ?

  


  2. Use mcr.microsoft.com/dotnet/runtime:3.1-bionic, somehow add required by amazon dependencies (how ? download content and attach from local ?) and configure it to run in Lambda runtime ?

  


  3. ... ?

  


  


  Will be glad to hear where is the solution here. Thanks !

  


• libavutil/hwcontext_qsv : Align width and heigh when download qsv frame

  6 avril 2022, par Wenbin Chen

  libavutil/hwcontext_qsv : Align width and heigh when download qsv frame
  The width and height for qsv frame to download need to be
  
  aligned with 16. Add the alignment operation.
  
  Now the following command works :
  
  ffmpeg -hwaccel qsv -f rawvideo -s 1920x1080 -pix_fmt yuv420p -i \
  
  input.yuv -vf "hwupload=extra_hw_frames=16,format=qsv,hwdownload, \
  
  format=nv12" -f null -
  Signed-off-by : Wenbin Chen <wenbin.chen@intel.com>
  
  Signed-off-by : Haihao Xiang <haihao.xiang@intel.com>
  

  • [DH] libavutil/hwcontext_qsv.c