Recherche avancée

Sur d’autres sites (5682)

• Automatically inject 360° 3D metadata into a video with a Bash script

  27 octobre 2019, par Eduardo Perez

  So, I have a Cygwin script I made which concats several videos into a single video with different variations, and I want to inject stereoscopic 3D metadata into the videos through the script so I don’t have to inject each video separately using Google’s injector tool. The videos are all 360° videos with top/bottom 3D and standard stereo audio rather than spacial audio, and in an MP4 container. Is there any way that I can either inject the needed 3D metadata using FFmpeg so I can upload it to YouTube as a 360VR video, or use the source code of Google’s injector tool or some other tool in order to inject the metadata the same way that Google’s injector tool would so it’s supported as a 360° 3D video by YouTube ?

  Also, will the injector tool automatically move the MOV atom to the beginning of the file (if the injector tool is used) or will I still need to use -movflags +faststart in FFmpeg ? The videos are kind of big and apparently using FFmpeg to concat several video files together and copy the stream codecs with -movflags +faststart and then injecting the metadata using Google’s Spherical Media tool is three times longer than just using FFmpeg in the same way but without -movflags +faststart, so if there was a fast way to do this I’d greatly appreciate it.

• How to append an image to a video using OpenCV or FFMPEG or Moviepy or other libraries ?

  19 juillet 2022, par Trần Tiến Văn

  Do you know a library in Python to add a frame image to an existing video ? The result video must have the same quality as the image.

  


  I tried to use OpenCV to add google image : https://www.google.com/search?q=google&sxsrf=ALiCzsZhrdoHnOTmg0We4dxtguCqzma5Jg:1657603343101&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiTh8bTzfL4AhWhplYBHfXNAKwQ_AUoAXoECAIQAw&biw=1492&bih=739&dpr=1.25#imgrc=PRtenhDnrVrfOM

  


  But the quality decreases when the video elongates.

  


  Here is the final result video : https://drive.google.com/file/d/1ArDvoX-kN9H_oLbACk3kU1Cid93SMczC/view?usp=sharing

  


  Here is my code using OpenCV :

  


          image = cv2.imread(path_image)
        height, width, dimensions = image.shape
            
        video = cv2.VideoCapture(path_video)
        
        
        frames = []
        while(True):
            
            ret, frame = video.read()
            
            if ret == True: 
                frames.append(frame)
                # frame = frame.resize(frame, (width, height), fx=0, fy=0, interpolation = cv2.INTER_CUBIC)
                
                # Press S on keyboard 
                # to stop the process
                if cv2.waitKey(1) & 0xFF == ord('s'):
                    break
            # Break the loop
            else:
                break
            
        video2 = cv2.VideoWriter(path_video,cv2.VideoWriter_fourcc('M','J','P','G'), 30, (width, height))
        for frame in frames:
            video2.write(frame)
        video2.write(image)
        video2.release()  # releasing the video generated     
        print("Added {}".format(image_name))


  


  I hope to improve the quality of this video.

  


• How to improve the animation quality with ffmpeg ?

  17 janvier 2017, par Loïc Poncin

  With ffmpeg I was able to get animation as an MP4 file and then I converted it into a GIF file.

  # Animation
  
  ani = animation.ArtistAnimation(fig, film, interval=100, blit=True, repeat_delay=100)
  
  ani.save('animation.mp4', writer="ffmpeg", fps=30)
  
  
  
  os.system("ffmpeg -i C:\my_path\\animation.mp4 C:\my_path\\animation.gif")

  My problem is that the quality is not really good.

  In my google drive (https://drive.google.com/open?id=0B7P95aWmH4DUbzJCaVZQM3Y0Y1U) you can find 3 files showing the animation : 1 PNG image (good quality), 1 MP4 file (normal quality), 1 GIF file (bad quality).

  How can I keep a good quality during the process ?