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• zoompan filter creates shaky image ?

  26 avril 2016, par user2126005

  I try to perform a basic zoompan with FFmpeg. I have an input list image (.jpg 400x300) and i create slice image video (.mp4 400*300) from it, with a zoom each image. This is my command :

   ffmpeg -y -loop 1 -i image01.jpg -loop 1 -i image02.jpg -loop 1 -i image03.jpg  -filter_complex "
  
   [0:v]zoompan=z='min(zoom+0.0015,1.5)':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':d=400 ,trim=duration=5,fade=t=in:st=0:d=0.5,fade=t=out:st=4.5:d=0.5,scale=400*300,setpts=PTS-STARTPTS[v0]; 
  
   [1:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,trim=duration=5,fade=t=in:st=0:d=0.5,fade=t=out:st=4.5:d=0.5,scale=400*300,setpts=PTS-STARTPTS[v1]; 
  
   [2:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,trim=duration=5,fade=t=in:st=0:d=0.5,fade=t=out:st=4.5:d=0.5,scale=400*300,setpts=PTS-STARTPTS[v2]; 
  
   [v0][v1][v2] concat=n=3:v=1:a=0, format=yuv420p[v]" -c:v libx264 -map "[v]"  output_no_audio.mp4

  Everything works...but the zoom is not looking okay. It is going zig-zag (the first image scale from center, remaining part is scale default)

  i’ve already consulted this link. But it inapplicable to this situation.

  Does anyone know how to make it zoom smooth and explain how to calculate ?

  thank in advance !

• ffmpeg get the audio stream from mp4 and send it to speech recognition

  12 juillet 2013, par user1896859

  I have few .mp4 video files in which at the start of each video file there is a word, I want to load these files get the audio check what is the spoken word and rename the file accordingly.

  Currently what i am doing is, converting all the mp4 files to wav and then sending the to speech recognition and then doing the renaming stuff.

  Is there a way to cut short the "converting to wav" part out and directly send the mp4 audio stream to speech recognition ??

  Thanks,

• How to use FFmpeg.wasm ? in nodejs

  29 novembre 2023, par James

  How to use FFmpeg.wasm to add audio to a video in Nodejs. Like adding some background audio to a video in Nodejs ? Can anyone here please help me with this ? https://github.com/FFmpeg-wasm/FFmpeg.wasm

  


  Reel3.mp4 is a video and wolf-howl-6310.mp3 is the audio that i want to merge.
What i tried ?

  


  import { readFile, writeFile } from "fs/promises";
import { FFmpeg } from "@ffmpeg.wasm/main";
import path from "path"; 

const currentDirectory = process.cwd();

const inputFilePath = path.join(currentDirectory, "Reel3.mp4"); 
const outputFilePath = path.join(currentDirectory, "Reel3.mp4"); 

const ffmpeg = await FFmpeg.create({ core: "@ffmpeg.wasm/core-mt" });

try {
  await ffmpeg.fs.writeFile("Reel3", await readFile(inputFilePath));
  await ffmpeg.run("-i", "wolf-howl-6310", "wolf-howl-6310.mp3");
  await writeFile(outputFilePath, ffmpeg.fs.readFile("Reel3.mp4"));
  console.log("Conversion successful!");
} catch (error) {
  console.error("Error:", error);
} finally {
  process.exit(0);
}