Recherche avancée

Sur d’autres sites (3227)

• Overlaying one video on another one and making black pixels or green pixels transparent

  30 décembre 2017, par kostya572

  I found great answer here : https://stackoverflow.com/a/38581696/2337706

  It works only for black pixels. The result is not perfect. I guess if change the overlay background color to other color, e.g. green, red, blue the results would be better. How can I change the other background color ?

  Here is my working code :

  ffmpeg -y \
  
      -i video.webm -i overlay.mov \
  
      -filter_complex " \
  
          [0:v]setpts=PTS-STARTPTS[base]; \
  
          [1:v]crop=iw:0.50*ih,setpts=PTS-STARTPTS+0/TB, \
  
                   format=yuva420p,colorchannelmixer=aa=0.7[overlay]; \
  
       [base][overlay]overlay=x=(W-w)/2:y=0[v]" \
  
   -map "[v]" -map 0:a -c:a copy -c:v libvpx-vp9 -lossless 1 -threads 4 -quality realtime \
  
   -speed 8 -tile-columns 6 -frame-parallel 1 -vsync 2 -shortest output.webm

  The result :
  

  Need result :
  

  Or need result (if impossible first with good quality) :
  

  Thank you, sorry for the frequent questions on ffpmpeg topic.

• Analyze a video's pixel data in Flash

  9 avril 2012, par simon.d

  I'm using FFmpeg to do some video analysis on my PC but I'd like to see if I can do something similar in the browser using Flash.

  Does Flash offer any way to take a video file as input, crack it open, and get access to the pixel data ?

  Thanks !

• ffmpeg Join MP4 videos, error (audio) of vine.co

  26 novembre 2014, par user3537531

  I’ve tried everything bucar after searching and I have not managed to unite vine.co videos to upload to youtube. Sometimes youtube error notifies Encryption, sometimes the video is cut audio to half, and in other cases the audio does not match the video.

  things I’ve tried

  ---

  file '/path/to/1.mp4'
  
  file '/path/to/2.mp4'
  
  ffmpeg -f concat -i list.txt -c copy result.mp4

  ---

  ffmpeg -i concat:"1.mp4|2.mp4" -codec copy result.mp4

  ---

  ffmpeg -i "concat:1.mp4|2.mp4" -c copy result.mp4

  The video is created, but always happen any errors or youtube audio conversion error tells me.

  We are talking of joining between 300 and 1,000 videos of between 3 and 6 seconds.

  From what I’ve read all would have to have the same frame rate and the same resolution.

  I have also proven to mp4box and post on youtube gives me trouble conversion

  mp4box-cat 1.mp4 -cat 2.mp4 -new result.mp4

  And not more I can do, I hope you can help me to attach a lot of videos on console. A greeting and thanks.