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• ffmpeg overlay video with semi transparent video

  25 octobre 2015, par endryha

  I am trying to overlay background video with another semi transparent video using ffmpeg.

  Thanks to Overlaying multiple videos with ffmpeg I managed to put video overlay over background video.

  The problem is that I don’t know how to make overlay video semitransparent.

  So far I am using following commands :

  ffmpeg -i VID_105470127_044810.mp4 -vf "movie=VID_21550603_142437.mp4 [a]; [in][a] overlay=10:10 [c]" combined.mp4
  
  
  
  ffmpeg -i VID_105470127_044810.mp4  -i VID_21550603_142437.mp4 -filter_complex "overlay, overlay=10:10" combined.mp4

  I tried to play with fade effect but this is not what I want. Please point me out where to look and what can I try to achieve this.

  UPDATE #1

  It looks like blend filter is exactly what I need but another issue came out :

  ffmpeg -i video1280x720.mp4 -vf "movie=video640x640.mp4 [a]; [in][a] overlay=10:10 [c]" combined.mp4
  
  
  
  [Parsed_blend_3 @ 0x7f8041500da0] First input link top parameters (size 1280x720, SAR 1:1) do not match the corresponding second input link bottom parameters (640x640, SAR 1:1)
  
  [Parsed_blend_3 @ 0x7f8041500da0] Failed to configure output pad on Parsed_blend_3

  So probably if I can resolve issue with different resolutions I am done with my task.
  Please advice what is the direction to go.

  UPDATE#2

  To solve different resolution problem I decided to crop video and then proceed with blending filter

  ffmpeg -i VID_1920x1080.mp4 -filter:v "crop=640:640:0:0" -c:a copy VID_1920x1080_cropped.mp4
  
  
  
  ffmpeg -i VID_1920x1080_cropped.mp4 -i VID_21550603_142437.mp4 \
  
  -filter_complex "[1:0] setdar=dar=1,format=rgba [a]; [0:0]setdar=dar=1,format=rgba [b]; [b][a]blend=all_mode='overlay':all_opacity=0.8" blended.mp4

• ffmpeg overlay video with semi transparent video

  20 janvier 2018, par endryha

  I am trying to overlay background video with another semi transparent video using ffmpeg.

  Thanks to Overlaying multiple videos with ffmpeg I managed to put video overlay over background video.

  The problem is that I don’t know how to make overlay video semitransparent.

  So far I am using following commands :

  ffmpeg -i VID_105470127_044810.mp4 -vf "movie=VID_21550603_142437.mp4 [a]; [in][a] overlay=10:10 [c]" combined.mp4
  
  
  
  ffmpeg -i VID_105470127_044810.mp4  -i VID_21550603_142437.mp4 -filter_complex "overlay, overlay=10:10" combined.mp4

  I tried to play with fade effect but this is not what I want. Please point me out where to look and what can I try to achieve this.

  UPDATE #1

  It looks like blend filter is exactly what I need but another issue came out :

  ffmpeg -i video1280x720.mp4 -vf "movie=video640x640.mp4 [a]; [in][a] overlay=10:10 [c]" combined.mp4
  
  
  
  [Parsed_blend_3 @ 0x7f8041500da0] First input link top parameters (size 1280x720, SAR 1:1) do not match the corresponding second input link bottom parameters (640x640, SAR 1:1)
  
  [Parsed_blend_3 @ 0x7f8041500da0] Failed to configure output pad on Parsed_blend_3

  So probably if I can resolve issue with different resolutions I am done with my task.
  Please advice what is the direction to go.

  UPDATE#2

  To solve different resolution problem I decided to crop video and then proceed with blending filter

  ffmpeg -i VID_1920x1080.mp4 -filter:v "crop=640:640:0:0" -c:a copy VID_1920x1080_cropped.mp4
  
  
  
  ffmpeg -i VID_1920x1080_cropped.mp4 -i VID_21550603_142437.mp4 \
  
  -filter_complex "[1:0] setdar=dar=1,format=rgba [a]; [0:0]setdar=dar=1,format=rgba [b]; [b][a]blend=all_mode='overlay':all_opacity=0.8" blended.mp4

• How to convert multiple video files in a specific path outputvideo with the same video name

  31 janvier, par Oussama Gamer

  The following code to converts a one video from mp4 to avi using ffmpeg

  


  ffmpeg.exe  -i "kingman.mp4"  -c copy "kingman.avi"

  


  I need to convert multiple videos in a specific path. "outputvideo" with the same video name

  


  This is the my code that needs to be modified.

  


  from pathlib import Path
import subprocess
from glob import glob

all_files = glob('./video/*.mp4')

for filename in all_files:
     videofile = Path(filename)
     outputfile = Path(r"./outputvideo/")
     codec = "copy"
     ffmpeg_path = (r"ffmpeg.exe")

outputfile = outputfile / f"{videofile.stem}"

outputfile.mkdir(parents=True, exist_ok=True)

command = [
    f"{ffmpeg_path}",
    "-i", f"{videofile}",
    "-c", f"{codec}",
    "{outputfile}",]

process = subprocess.Popen(
    command,
    stdout=subprocess.PIPE,
    stderr=subprocess.PIPE,
    text=True,
    bufsize=1,
    universal_newlines=True)
process.communicate()