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• ffmpeg merge silent video with another video+audio

  4 mars 2016, par Mark Dagger

  I want to create, in a single command, a video from 3 sources :

  1. a silent background video ;
  2. a smaller video to be overlayed (same length of 1), KEEPING its AUDIO ;
  3. a PNG logo to be overlayed

  I can create the video but cannot get the audio track. I don’t understand if -vf is supposed to work in this case. This is what I’ve tried to do :

  ffmpeg.exe -y -i MASTER_SILENT_VIDEO.mp4 -vf "movie=SMALLER_VIDEO_WITH_AUDIO.flv, scale=320:-1[inner];movie=MY_LOGO.png[inner2]; [in][inner] overlay=800:480,amerge [step1]; [step1][inner2] overlay=30:30 [out]" completed.mp4

  The "amerge" filter should do the audio merging job, but of course it doesn’t work. I’ve found similar questions involving -map or filtergraph but they refer to mixing a video source and an audio source ; I tried several filtergraph examples without success. Any idea ?

• ffmpeg terminal : How can I re-encode a video file using all the parameters copied from another video ? [closed]

  5 décembre 2022, par Lever

  I have two videos A and B. How can I re-encode B using ALL the parameters of A ?
I would like to use both A and B as inputs, but all parameters are extracted from A, then B is re-encoded with the A-parameters including both video and audio. Is there a simple command to copy ALL the parameters of A ?

  


  Thanks !

  


  I know the typical parameters of a video includes the resolution, fps and so on. But it seems that I always miss something rather than get ALL the parameters to make A and B the same.

  


  The background is that I need to concatenate about 100 videos, but only a few of which has lower quality than others. I don't want to re-encode all of them. Therefore I'm trying to re-encode the lower ones to match the others, and then I can use the file-level concatenation command avoiding re-encode all of them.

  


• Directly response video to the client for download when ffmpeg cutting the video

  7 mars 2023, par web disiner

  I am bulding a web application using Node.js with Express framework. That simply cut the video and send to the client browser as a response for download. For cutting a video i use FFmpeg tool.
all things working fine but ffmpeg cutted video save to working directory.

  


  Below is my code..

  


  const child_process= require("child_process")

const cutting =async()=>{
    ffmpeg = child_process.spawn('ffmpeg', [

        "-i", /video.mp4,
         "-ss", "00:02:20",
         "-to","00:02:50",
         "-c:v", "copy", 
         "-c:a", "copy", 
         "output3.mp4"






    ])
    ffmpeg.stderr.on('data', function(data) {
            console.log('ffmpeg stderr data = '+data );
      });

}


  


  This is image of working directory

  


  Now i want when **ffmpeg cutting the video it directly send chunks of video to the client for download **without saving it in working directory or server where my code is hosted.

  


  How can i do this ? which approch will useful for this ?
Anyone help me. much appreciated
Thanks