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• ffmpeg overlay to scroll a super long image, blinking & glitchy issue

  17 janvier 2023, par goforu

  I have a super long image and want to scroll vertically using ffmpeg filter overlay, it takes about 10 mins to scroll from the top to the end. When the image is small and time is short it scroll very smoothly, but when it comes to a super long image and the time comes to 10 mins. It gets blinking and glitchy. How to solve this issue ?

  


  ffmpeg -y -r 1 -loop 1 -t 544.3800000000026 -i /Users/joey/Library/Application Support/Electron/tmp/content.png -r 60 -loop 1 -t 544.3800000000026 -i /Users/joey/Library/Application Support/Electron/tmp/bg.png -filter_complex [1:v]crop=1080:810:0:0,fps=60[v1];[v1][0:v]overlay=x=0:y=if(gt(t\,1.29)\,48.6-151.75127511093854*(t-1.29)\,48.6)[mv1];[1][mv1]overlay=y=0[m1] -preset ultrafast -map [m1] -t 544.3800000000026 /Users/joey/Library/Application Support/Electron/tmp/output.mp4


  


• Using ffmpeg and aresample with super low sample rate

  23 mars 2020, par Jurijs Kovzels

  I am trying to use ffmpeg to get data to generate list of peaks with resolution of 30 peaks per second.

  the params I’m using are :

  ffmpeg -y -i audio.wav -filter_complex "[0]aresample=30[resampled]" -map [resampled] output_30.wav

  which kills almost all information and resulting data array contains only very small values. This waveform is before resampling
  

  versus after resampling to 60kHz

  

  My question is if it is possible to use ffmpeg and get maximums (peaks) over each timespan (second or 1/20 second) of audio ?

• MoviePy on EC2 Instance Super Slow

  27 janvier 2020, par connorvo

  No matter what size EC2 instance I use, MoviePy.write_videofile() takes forever.

  I ran it on a t2.micro, c5.large, and c4.2xlarge and they all projected to take the same amount of time ( 7 hours).

  I have a 720mb mp4 file that I am adding a 30mb mp4 file to the beginning of and then putting a text overlay on the entire video (just static text saying the company name in the bottom corner).

  final_video.write_videofile(
  
      f"{FINAL_VIDEO_FILENAME}.mp4", 
  
      fps=60,
  
      codec='libx264', 
  
      audio_codec='aac', 
  
      temp_audiofile=f'{FINAL_VIDEO_FILENAME}_temp_audio.mp4', 
  
      remove_temp=True,
  
      threads = 8, # this was for c4.2xlarge instance
  
  )

  def __get_intro_clip(self, title, size, fps):
  
          clip = ( VideoFileClip('ytbot/intro_video/intro_video.mp4')
  
              .subclip(0,9.5)
  
              .resize(size)
  
              .set_fps(fps)
  
          )
  
  
  
          # make bigger then resize() so stroke works properly
  
          text_clip1 = ( TextClip(f'{TEXTTEXT}',font='Helvetica-Narrow-Bold',fontsize=self.DEFAULT_TEXT_SIZE*self.TITLE_MULTIPLIER,color='white',stroke_color='black',stroke_width=self.DEFAULT_STROKE_SIZE*self.TITLE_MULTIPLIER).resize(self.DEFAULT_RESIZE_MULTIPLIER)
  
              .margin(bottom=175, opacity=0)
  
              .set_position('center')
  
              .set_duration(4) 
  
              .set_start(1)
  
              .fadein(0.25)
  
              .fadeout(0.25)
  
          )
  
          text_clip2 = ( TextClip(f'presents',font='Helvetica-Narrow-Bold',fontsize=self.DEFAULT_TEXT_SIZE*self.TITLE_MULTIPLIER*0.7,color='white',stroke_color='black',stroke_width=self.DEFAULT_STROKE_SIZE*self.TITLE_MULTIPLIER).resize(self.DEFAULT_RESIZE_MULTIPLIER)
  
              .set_position('center')
  
              .set_duration(3.5) 
  
              .set_start(1.5)
  
              .fadein(0.25)
  
              .fadeout(0.25)
  
          )
  
          text_clip3 = ( TextClip(title,font='Helvetica-Narrow-Bold',fontsize=self.DEFAULT_TEXT_SIZE*self.TITLE_MULTIPLIER,color='white',stroke_color='black',stroke_width=self.DEFAULT_STROKE_SIZE*self.TITLE_MULTIPLIER).resize(self.DEFAULT_RESIZE_MULTIPLIER)
  
              .margin(top=175, opacity=0)
  
              .set_position('center')
  
              .set_duration(3) 
  
              .set_start(2)
  
              .fadein(0.25)
  
              .fadeout(0.25)
  
          )
  
  
  
          return CompositeVideoClip([clip, text_clip1, text_clip2, text_clip3]).fadein(0.5)
  
  
  
      def edit_yt_video(self, video_path, name):
  
          video_clips = []
  
  
  
          clip = VideoFileClip(video_path)
  
  
  
          video_clips.append(self.__get_intro_clip(name, clip.size, clip.fps))
  
  
  
          text_clip = ( TextClip('Company: {name}',font='Helvetica-Narrow-Bold',fontsize=self.DEFAULT_TEXT_SIZE,color='white',stroke_color='black',stroke_width=self.DEFAULT_STROKE_SIZE).resize(self.DEFAULT_RESIZE_MULTIPLIER)
  
              .margin(bottom=15, left=15, opacity=0)
  
              .set_position(('left', 'bottom'))
  
              .set_duration(clip.duration)
  
          )
  
  
  
          video_clips.append(CompositeVideoClip([clip, text_clip]).fadeout(0.5).crossfadein(0.5))
  
  
  
          return concatenate_videoclips(video_clips, padding=-1, method='compose')