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• How to rotate an image overlay in ffmpeg around the image center ?

  14 mars 2023, par ktrace

  I'm using ffmpeg to scale, rotate and overlay an image on a video. I'm able to rotate the image by the desired angle but the overlay ends up being moved both vertically and horizontally from the expected position.

  


  The commands I've tried and their corresponding outputs are shown below. Command 1 gives the expected output, 2 and 3 do not.

  


  How can I modify my commands in general, to rotate the overlay image around the image center, to get the expected output ?

  


  

  


  


  ffmpeg -i graphpaper.mp4 -i arrow.png -y -filter_complex [1:v]scale=w=364:h=370[overlay0] ;[overlay0]rotate=a=0:c=none:ow=rotw(0):oh=roth(0)[rotate0] ;[0:v][rotate0]overlay=x=419:y=168[output0] -map [output0] sample-overlay-on-graph-paper.mp4

  


  


  

  


  


  ffmpeg -i graphpaper.mp4 -i arrow.png -y -filter_complex [1:v]scale=w=364:h=370[overlay0] ;[overlay0]rotate=a=0.8017360589297406:c=none:ow=rotw(0.8017360589297406):oh=roth(0.8017360589297406)[rotate0] ;[0:v][rotate0]overlay=x=419:y=168[output0] -map [output0] sample-overlay-on-graph-paper.mp4

  


  


  

  


  


  ffmpeg -i graphpaper.mp4 -i arrow.png -y -filter_complex [1:v]scale=w=364:h=370[overlay0] ;[overlay0]rotate=a=5.493783719179012:c=none:ow=rotw(5.493783719179012):oh=roth(5.493783719179012)[rotate0] ;[0:v][rotate0]overlay=x=419:y=168[output0] -map [output0] sample-overlay-on-graph-paper.mp4

  


  


  Links to input files :

  


  

  • graphpaper.mp4 https://imgur.com/a/daHI7j0

  


  • arrow.png https://imgur.com/a/wWwnnfq

  


  


• scale issues when adding images to a video

  27 septembre 2019, par Geo

  When I add two images to a video, the second image added is scaled down for some reason.

  I have two images arrow.png and icon1.png and one background.mp4 video, when I added the two images onto the video, the result is that the first image is added with the right size, but the second image is added with reduced size, probably in half of the specified size.

  this is my command :

  ffmpeg -i background.mp4 -i arrow.png -i icon1.png -filter_complex "[1:v]scale=311:175,setsar=1,format=bgra[img1];
  
  [img1]rotate=30*PI/180:c=none:ow=rotw(30*PI/180):oh=roth(30*PI/180)[rotate1];[2:v]scale=319:179,setsar=1,format=bgra[img2];
  
  [img2]rotate=59*PI/180:c=none:ow=rotw(59*PI/180):oh=roth(59*PI/180)[rotate2];[0][rotate1]overlay=242:-22:enable='between(t,0,6)',scale=hd720[overlay1];
  
  [overlay1][rotate2]overlay=34:13:enable='between(t,0,6)',scale=hd720" -c:a copy -c:v libx264 -preset ultrafast -y test01.mp4

  I am expecting the same size as the specified

• How can I solve the error when installing ffmpeg [closed]

  11 mars 2024, par zhiyang hou

  OS :
uname -r
3.10.0-957.27.2.el7.x86_64

  


  I performed the following steps on CentOS :

  


  1.Installed dependency libraries :

  


  sudo yum install epel-release -y
sudo yum install autoconf automake cmake freetype-devel gcc gcc-c++ git libtool make      mercurial nasm pkgconfig zlib-devel -y


  


  2.Cloned the FFmpeg repository :

  


  git clone https://git.ffmpeg.org/ffmpeg.git


  


  3.Compiled and installed FFmpeg :

  


  cd ffmpeg
./configure --enable-shared
make -j$(nproc)
sudo make install


  


  Then, I encountered the following issue :

  


  (123) [root@b0a30580415d ffmpeg]# make install
INSTALL libavdevice/libavdevice.a
X86ASM  libavcodec/x86/vvc/vvc_mc.o
libavcodec/x86/vvc/vvc_mc.asm:55: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:55: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:55: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:55: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:55: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:55: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:55: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:56: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:56: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:56: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:56: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:56: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:56: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:56: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:57: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:57: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:57: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:57: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:57: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:57: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:57: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:58: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:58: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:58: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:58: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:58: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:58: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:58: error: operand 1: expression is not simple or relocatable
make: *** [libavcodec/x86/vvc/vvc_mc.o] Error 1


  


  I am trying to find relevant information on the ffmpeg official website, but I don't know how to solve it. I hope to get guidance from someone with strong technical skills. Thank you.