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• ffmpeg - put video atop of second and center it while keeping aspect ratio

  25 août 2022, par artolini

  I'm trying to put 16:9 video atop of same blurred 1:1 video just like on the photos.
I'm looking a wise guy with ffmpeg knowledge to help me with think of about the command which will :

  


  

  1. rescale 16:9 (sharp video) accordingly to blurred one height (keeping the width automatically to ratio)

  


  2. center the 16:9 (sharp video) to x position = (blurredVideoWidth / 2) - (sharpVideoWidth / 2)

  


  


  My current comment looks like this :

  


  ffmpeg -y -i ${squareBlurredVideoUri} -i ${square169VideoUri} -filter_complex "[1:v]scale=620:-1[v2];[0:v][v2]overlay=0:0" -codec:a copy ${squareFinalVideoUri}

  


  As you can see scale is hardcoded to 620 which is wrong because we should rescale it accordingly to blurred video height.

  


  Overlay is set to 0:0 which places sharp video to x = 0 and y = 0 and should center it

  


  Thank you in advance.

  


  Current result :

Desired result :


  


• Can you insert text from a file in real time with ffmpeg streaming ?

  6 décembre 2020, par Fight Fire With Fire

  I have this code i use to stream a file and place the name of the show of the video at a certain time of the video ( name_of_show ) at the top of the screen, and the bottom of the screen it take the name of the show from video_title.txt and places it on the bottom of the screen.

  


  What I want to do is find a way at a interval say 1 or 2 minutes, pull whatever text is currently in video_title.txt and place it in the video for a few seconds.

  


  I would update video_title.txt from another python program. Here's my current code below.

  


             command = [
        "ffmpeg" , "-re" , "-i" , video[0] ,
        "-vf" ,  "[in]drawtext=fontsize=40:fontcolor=white:box=1:boxcolor=black@0.8:boxborderw=5:fontfile=/home/fonts/timeless.ttf: text='" + name_of_show + "':x='W-(W+tw)*mod(t\,10)/10':y='H/20':enable='between(t,50,70)',drawtext=fontsize=20:fontfile=/home/fonts/timeless.ttf:textfile=/video_title.txt:fontcolor=white:box=1:boxcolor=black@0.8:boxborderw=5:x=W-w+5:y=h-th-50:enable='1'[out]"
        "-vcodec" , "libx264", "-pix_fmt", "yuv420p",
        "-preset" , "medium" , "-r" , "30" , "-g" , "48" , "-b:v" , "2500k" ,
        "-acodec" , "libmp3lame" , "-ar" , "44100", "-threads" , "6" ,
        "-q:a" , "3" , "-b:a" , "712000" ,"-bufsize", "512k" , "-f" ,
        "flv" , STREAM_URL,


  


  Ultimately the effect I am trying to achieve is a long stream of lets say 1 hour on twitch/youtube where someone could send a text message and it would appear in the stream.

  


• How to use ffmpeg to add a text to avi video ?

  13 janvier 2014, par qliq

  I am trying to put a simple text on the bottom of video using ffmpeg on Ubuntu 12.04 . I tried this which is suggested in several places :

  ffmpeg -i input.avi -vf drawtext="fontfile=/usr/share/fonts/truetype/ttf-dejavu/DejaVuSerif.ttf:text='Text to write':fontsize=20:fontcolor=black:x=100:y=100" output.avi

  But I get this error each time :

  ffmpeg version 0.8.3-4:0.8.3-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
  
    built on Jun 12 2012 16:37:58 with gcc 4.6.3
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  Input #0, avi, from 'input.avi':
  
    Duration: 04:09:09.66, start: 0.000000, bitrate: 480 kb/s
  
      Stream #0.0: Video: mpeg4 (Advanced Simple Profile), yuv420p, 320x240 [PAR 1:1 DAR 4:3], 45 tbr, 45 tbn, 45 tbc
  
      Stream #0.1: Audio: mp3, 48000 Hz, stereo, s16, 64 kb/s
  
  [buffer @ 0x860d5a0] w:320 h:240 pixfmt:yuv420p
  
  Incompatible sample format 's16' for codec 'ac3', auto-selecting format 'flt'
  
  [ac3 @ 0x8607a00] invalid bit rate
  
  Output #0, avi, to 'output.avi':
  
      Stream #0.0: Video: mpeg4, yuv420p, 320x240 [PAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 90k tbn, 45 tbc
  
      Stream #0.1: Audio: ac3, 48000 Hz, stereo, flt, 200 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  Error while opening encoder for output stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height

  Appreciate your help.