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• FFMPEG : How to extract a PNG sequence from a video, remove duplicate frames in the process and keep the original frame number ?

  16 mai 2020, par Simon

  I have a recording of an old game which has variable framerate. Since I want to process individual frames to upscale and modernize the footage I would like to avoid any duplicate frames. I know that I can use this function to extract all frames from a video :

  



  ffmpeg -i input.mov -r 60/1 out%04d.png


  



  And I know that I can remove duplicate frames using this function :

  



  ffmpeg -i input.mov -vf mpdecimate,setpts=N/FRAME_RATE/TB output.mov


  



  However, the above command removes duplicate frames and puts frames next to each other whereas in order to keep a timecode of sorts it would be a lot more useful to be able to extract PNGs with frame number (video is progressive 60fps) but without all of the duplicates.

  



  So, the question is : what if I want to extract PNG files BUT maintain the original corresponding framenumber within the sequence ? So, if we have a video with 10 frames and frames 2-8 are duplicates it spits out 1.png 2.png 9.png and 10.png ? How do I combine both bits of code listed above ?

  


• libavutil : Use an intermediate variable in AV_COPY*U

  28 juillet 2016, par Martin Storsjö

  libavutil : Use an intermediate variable in AV_COPY*U
  If AV_RN and AV_WN are macros with multiple individual reads and
  
  writes, the previous version of the AV_COPYU macro would fail if
  
  the reads and writes overlap.
  This should not be any less efficient in any case, given a
  
  sensibly optimizing compiler.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavutil/intreadwrite.h

• FFmpeg GIF dump & video slideshow errors

  27 avril 2017, par Techie Android

  I’m running Windows 10 and have the latest static 64bit nightly FFmpeg version. Here are my scripts, I’ve been trying to get them fixed but I can’t seem to get either to work.

  I have a GIF file named gif.gif that I need the frames dumped out of and named in this order : img000.png img001.png img002.png and so forth.

  ffmpeg -i "gif.gif" "%img%%03d.png"

  It’s error message is :

  [NULL @ 052857c0] Unable to find a suitable output format for ’C :\Users\username’
  C :\Users\username : Invalid argument

  This is where I need the individual frames to be encoded into a video file and get it to duplicate the frames necessary to make it a slideshow. It should copy each frame 150 times so that they will last for 5s each at 30fps.
  The filename is video maker.bat

  ffmpeg -i %img%%03d.png -framerate 1/5 -c:v libx264 -r 30 -pix_fmt yuv420p "output.mp4"

  It’s error message is :

  imgC :\myfilesdirectoryhere\video maker.bat3d.png : Protocol not found