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  • 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.

    


  • ffmpeg with background png

    9 août 2023, par hueta

    I need a video with aspect ratio 9:16 to be overlaid on a png picture with aspect ratio 16:9 (as in the screenshot). So far I have come to this :
-filter_complex "[0:v]scale=w=1920:h=1080:force_original_aspect_ratio=decrease,pad=1920:1080 :(ow-iw)/2 :(oh-ih)/2[base] ;[1:v]format=rgba,scale=1920:1080[v1] ;[v1][base]overlay=0:0"
but the output instead of png picture is just a black background, maybe someone knows what the problem is ?enter image description here

    


    -filter_complex "[0:v]scale=w=1920:h=1080:force_original_aspect_ratio=decrease,pad=1920:1080 :(ow-iw)/2 :(oh-ih)/2[base] ;[1:v]format=rgba,scale=1920:1080[v1] ;[v1][base]overlay=0:0"
but the output instead of png picture is just a black background

    


  • lavf/qtpalette : Treat 1-bit video as palettized

    29 décembre 2015, par Mats Peterson
    lavf/qtpalette : Treat 1-bit video as palettized

    This commit for qtpalette.c and qtpalette.h adds 1-bit video to the
    
"palettized video" category, since if the video sample description
    
contains a palette, the two colors in the palette can be any color, not
    
necessarily black & white.
    

    Unfortunately, I’ve noticed that the qtrle (QuickTime Animation) decoder
    
blindly assumes that 1-bit video is black & white. I don’t have enough
    
knowledge about the decoder to fix this, though.
    

    Below is a link to a sample 1-bit QuickTime Animation clip of a rotating
    
earth that uses blueish colors, and they will be correctly rendered in
    
QuickTime, but not in FFmpeg (which will use black & white).
    

    https://drive.google.com/open?id=0B3_pEBoLs0faUlItWm9KaGJSTEE
    

    Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavformat/qtpalette.c
    • [DH] libavformat/qtpalette.h

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