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• ffmpeg - preserve metadata for the converted files (mtime)

  5 mars 2017, par silent

  I have a simple batch file that converts videos from mobile. I want to keep the original creation and modification time in converted files as well.

  For example, I have :

  
  
  
  name
  creation time
  modification time
  
  file.mp4
  21 March 2016
  21 March 2016
  
  

  after conversion I have :

  
  
  
  name
  creation time
  modification time
  
  file_new.mp4
  05 March 2017
  05 March 2017
  
  

  but all I want is :

  
  
  
  name
  creation time
  modification time
  
  file_new.mp4
  21 March 2016
  21 March 2016
  
  

  My ffmpeg command (Windows) :

  for %%a in ("*.mp4") do ffmpeg -i "%%a" -c:v libx264 -crf 23 -preset medium -map_metadata 0 -movflags +faststart -c:a libvo_aacenc -b:a 96k "newfiles\%%~na.mp4"

• FFMpeg is writing a matplotlib animation with diminishing quality

  3 mars 2017, par Bryan Stafford

  I am trying to create a bunch of animations that follow the paths National Hockey League teams travel during the current season. Currently, my animation looks like this.

  As you can see, the animation begins decently sharp but within 2 seconds the quality bottoms out and everything is grainy.

  The relevant code is this :

  ani = animation.FuncAnimation(fig, update, frames=len(all_x + 20), 
  
                                interval=75, repeat=False)
  
  filepath =  map_team + '.mp4'
  
  ani.save(filepath, writer='ffmpeg', fps=30)
  
  plt.tight_layout()
  
  plt.show()

  I have chosen FFMpeg as my writer because I hope to put about 30 graphics online and the MP4 format keeps each file around 1.5MB. If there’s a way to keep the graphics sharp, with low file sizes, and able to be uploaded onto Imgur, I would love to do that with my project.

  Thanks.

• How to route FFMPEG screen capture output to Python for OpenCV processing ?

  16 décembre 2016, par Bitani

  I am trying to capture the screen of a Mac, specifically game windows, and process them in real-time using OpenCV. I currently have it working with pyscreenshot and a conversion to a numpy array, but the max framerate of this method, on any system, appears to be around 10 FPS.

  Obviously with games it would be very beneficial to be able to process 30+ FPS, and so I found that FFMPEG could record the screen using this command :

  ffmpeg -y -f avfoundation -capture_cursor 1 -i "1" -pix_fmt yuv420p -vf scale=1024:-1 -r 30 out.mp4

  That will write the screen to a file, out.mp4, with a width of 1024 and a frame rate of 30 FPS. Works perfectly ! But now I’ve searched and searched and searched for a method to route FFMPEG’s output to Python and.. no luck.

  If anybody knows of a way to do this I would be greatly appreciative, as I’ve been trying to solve this for quite a while !

  Thanks, and happy holidays !