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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

  


  


• OpenCV 3.0.0 "configure" fails, ffmpeg not downloaded

  19 avril 2017, par S.H

  I get the following error when trying to configure OpenCV using CMAKE on windows :

  CMake Warning at cmake/OpenCVUtils.cmake:865 (message):
  
  Download: Local copy of opencv_ffmpeg.dll has invalid MD5 hash:
  
  d41d8cd98f00b204e9800998ecf8427e (expected:
  
  89c783eee1c47bfc733f08334ec2e31c)
  
  
  
  Call Stack (most recent call first):
  
  3rdparty/ffmpeg/ffmpeg.cmake:10 (ocv_download)
  
  cmake/OpenCVFindLibsVideo.cmake:193 (include)
  
  CMakeLists.txt:527 (include)
  
  
  
  
  
  Downloading opencv_ffmpeg.dll...
  
  CMake Error at cmake/OpenCVUtils.cmake:888 (file):
  
  file DOWNLOAD MD5 mismatch
  
  
  
  for file: [C:/research/opencv300/sources/3rdparty/ffmpeg/downloads/89c783eee1c47bfc733f08334ec2e31c/opencv_ffmpeg.dll]
  
  expected MD5 sum: [89c783eee1c47bfc733f08334ec2e31c]
  
  actual MD5 sum: [d41d8cd98f00b204e9800998ecf8427e]
  
  
  
  Call Stack (most recent call first):
  
  3rdparty/ffmpeg/ffmpeg.cmake:10 (ocv_download)
  
  cmake/OpenCVFindLibsVideo.cmake:193 (include)
  
  CMakeLists.txt:527 (include)
  
  
  
  
  
  CMake Error at cmake/OpenCVUtils.cmake:892 (message):
  
  Failed to download opencv_ffmpeg.dll.  Status=1;"unsupported protocol"
  
  Call Stack (most recent call first):
  
  3rdparty/ffmpeg/ffmpeg.cmake:10 (ocv_download)
  
  cmake/OpenCVFindLibsVideo.cmake:193 (include)
  
  CMakeLists.txt:527 (include)
  
  
  
  
  
  Configuring incomplete, errors occurred!

  I tried downloading opencv_ffmpeg.dll manually, but the configure process didn’t work.

  Can you help me, how to fix that ?

• Using FFMPEG to losslessly convert YUV to another format for editing in Adobe Premier

  17 octobre 2013, par Wolfman's Brother

  I have a raw YUV video file that I want to do some basic editing to in Adobe CS6 Premiere, but it won't recognize the file. I thought to use ffmpeg to convert it to something Premiere would take in, but I want this to be lossless because afterwards I will need it in YUV format again. I thought of avi, mov, and prores but I can't seem to figure out the proper command line to ffmpeg and how to ensure it is lossless.

  Thanks for your help.