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• Question with complex ffmpeg compositing, overlays, visualizations etc [closed]

  14 novembre 2023, par Michael Ciesielczyk

  I'm trying to make a video that will consist of an underlying video that will need to repeat until the end of the video. The video's length as well as to video elements will come from a wav audio file. There will also be one static image overlay and 3 to 5 more images that will be overlayed at set intervals.

  


  I was able to get a little ways with a few of the elements but when I have tried to put them all together in one go I can't figure it out. And I'm trying to get it in one got to get the best possible image quality I can so I don't end up re encoding the video multiple times. I'm also using this as a template for multiple videos so when I get it figured out I can just change the images to generate the new videos.

  


  so I have these elements :

  


  background video: bg.mp4
audio file: test.wav
static image: logo.png
rotating images: 1.png, 2.png, 3.png


  


  so I have :

  


  ffmpeg -i test.wav -filter_complex " 
[0:a]avectorscope=s=1320x1240:zoom=1.5,pad=3840:2160[vs]; 
[0:a]showwaves=s=1280x202:colors=White:mode=line[sw];[vs][sw]overlay=x=(main_w- 
overlay_w)/2:y=(main_h-400)[bg]" -map "[bg]" -map 0:a  -y -acodec aac video.mp4


  


  This gets me my 4k video file and my two visualizations and my audio in my video file placed about where I want them.

  


  I can get the rotating images to appear at the right times overlayed on the bg.mp4 file with this.

  


  ffmpeg -i bg.mp4 -i 1.png -i 2.png -i 3.png -filter_complex "[0] 
[1]overlay=x=0:y=0:enable='between(t,0,4)'[out];[out] 
[2]overlay=x=0:y=0:enable='between(t,4,8)'[out];[out] 
[3]overlay=x=0:y=0:enable='between(t,8,12)'[out]" -map "[out]" video.mp4


  


  But I can't figure out how to do it all together. I have ended up with bg.mp4 file playing inside the avectorscope visual. like the rest of that box was cropping it. And I know I can loop an overlay video with -stream_loop -1 and shortest=1 but I'm not sure what to do in order to have the bg video loop until the end of the audio.

  


  I think some of my trouble is I am terrible dyslexic and a missing comma or missing close quote and it's a no go.

  


  Anyone able to help me put this together ?

  


  Oh and one last thing. I'm also wanting to put some simple text overlayed. like with

  


  overlay=0:0,drawtext=fontfile=/usr/share/fonts/TTF/Vera.ttf:fontcolor=
white:x=200:y=200:text='"text'[out]"`


  


  thank you to anyone who can help me !

  


• The question about ffmpeg drawtext filter [closed]

  5 mai 2024, par B1GGersnow

  I tried to use rockchip(aarch64) hardware acceleration and add a drawtext filter to add watermarks. However, squares appear when multiple Chinese fonts are added.

  


  This is my compilation parameter.

  


  ./configure --prefix=/usr --enable-gpl --enable-version3 --enable-libdrm --enable-rkmpp --enable-rkrga --enable-filter=drawtext --enable-libharfbuzz --enable-libfreetype --enable-libfontconfig --enable-libfreetype --enable-libfribidi


  


  


  1. ffmpeg -hwaccel rkmpp -hwaccel_output_format drm_prime -i 1.mp4 -vf scale_rkrga=w=1920:h=1080,hwdownload,format=nv12,drawtext=text='中文':fontfile=msyh.ttc:fontsize=200 -c:v h264_rkmpp -y -t 10  output.mp4
img1

     


  


  2. ffmpeg -hwaccel rkmpp -hwaccel_output_format drm_prime -i 1.mp4 -vf "scale_rkrga=w=1920:h=1080,hwdownload,format=nv12,drawtext=text='中文字幕测试':fontfile=msyh.ttc:fontsize=200" -c:v h264_rkmpp -y -t 10  output.mp4
img2

     


  


  


  But I try to use apt install ffmpeg to install ffmpeg which is officially maintained by Ubuntu. I got the right result. So I think it's the library, and I'm trying to compile using the official library.

  


  ./configure --prefix=/usr --enable-gpl --enable-version3 --enable-filter=drawtext --enable-libharfbuzz --enable-libfreetype --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libx264


  


  I still get garbled results.

  


  Is this because there is something wrong with my compilation dependent library ?

  


  When I compiled it with the same parameters on wsl, there was no garbled code.

  


• FFMPEG syntax clarification question for the "between" function [closed]

  31 octobre 2024, par user2571504

  I've been using a crop filter script to hold the crop in one place for the first 750 frames, then automate a moving crop to follow some action in the clip. It's working great for chunky moves (5 pixel jumps as shown below) :

  


  -filter_script:v:0 crop-filter-script.txt

crop='1500:1000:100:
if(between(n,0,750),100,
if(between(n,751,756),105,
if(between(n,757,762),110,
if(between(n,763,768),115,
if(between(n,769,774),120,
if(between(n,775,780),125,
if(between(n,781,786),130,etc


  


  My question is about how "between" is interpreted. Does "between(n,751,756)" mean "frames 751, 752, 753, 754, 755 & 756" ? or does it exclude the start and ending frames, so that it's "between" those two numbers ? Like : 752, 753, 754 & 755 only ?

  


  Thanks !