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• How do I generate a color screen for the duration of an MP3 in ffmpeg ?

  25 février 2019, par yaggelee

  I have successfully generated a blue screen to add to an mp3. But, I have always needed to include the length of the clip to match the mp3. When I don’t include a timecode it continues to generate footage until I cancel the command.

  ffmpeg -f lavfi -i color=blue:s=1920x1080 -i input.mp3 -t 00:02:08 output.mp4

  How do I specify that I only want color generated during the length of the mp3 that I am adding ?

  ffmpeg -i <.jpg> -i <.mp3>

  This worked too but I don’t want to rely on a jpeg file.

• avcodec/vvc/filter : skip deblocking filter for palette

  14 mai, par Wu Jianhua

  avcodec/vvc/filter : skip deblocking filter for palette
  Signed-off-by : Wu Jianhua <toqsxw@outlook.com>
  

  • [DH] libavcodec/vvc/filter.c

• ffmpeg showwaves - Change color of waveform on top of an image

  15 août 2020, par Grant SYNKOP

  I need help with ffmpeg.

  



  I wrote this code :

  



  @echo off  
for %%F in (*.opus *.ogg) do 
(  
  ffmpeg -y -i "%%F" -loop 1 -i "default.jpg" -filter_complex " 
 [0:a]showwaves=s=2560x1440:mode=cline:r=30,colorkey=0x000000:0.01:0.1,format=yuva420p[v];
[1:v][v]overlay[outv]" -map "[outv]" -pix_fmt yuv420p -map 0:a -vcodec libvpx-vp9 -lossless 1 -speed 8 -acodec copy -shortest "%%~nF.webm" 
)


  



  What it does is that for each .opus or .ogg audio file, it'll output a video with a default.jpg background image (which is completely white) and a waveform on top of it, with the audio playing.
Problem is, I would change the color of the waveform to black, but I don't understand how colorkey works even after reading the documentation...

  



  Basically, I want to obtain something like this (but the waveform being in black) : https://www.youtube.com/watch?v=k9arneFijG8

  



  Thanks in advance.