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• How to scroll long picture(big height) scrolling with background image in ffmpeg,Text in video products will flicker

  15 juin 2022, par user18550619

  use overlay or scoll filter,the result of video still flicker !
ffmepg cmd as follow :

  


  1.scoll filter

  


  ffmpeg -y -loop 1 -i input.png -i bg.png -filter_complex "[0]scroll=vertical=0.000819672131147541,crop=iw:1280:0:0,format=yuva444p[scrollView] ;[1][scrollView]overlay=0:0:enable='between (t,0,27.466666666666665)'" -t 27.466666666666665 E :\output1.mp4

  


  2.overlay with time change y position

  


  ffmpeg -y -r 1 -loop 1 -t 27.466666666666665 -i input.png -filter_complex "color=white:s=720x1280,fps=fps=30[bg] ;movie=bg.png[bg1] ;[bg][bg1]overlay=0:0[bg2] ;[bg2][0]overlay=y=-'t*60':shortest=1[video]" -preset ultrafast -b:v 1989k -map [video] E :\output2.mp4

  


  input.png

  


  bg.png

  


• ffmpeg - Drawing rotated text on video with complex filters takes a very long time

  14 mai 2019, par Bedrule Paul

  I am trying to overlap different text pieces on some placeholders in a video, and I am using multiple complex filters of the following type :

  ffmpeg -i ~/Desktop/input.mp4 -filter_complex  \
  
      "color=black@0:100x100,format=yuva444p[c]; \
  
      [c][0]scale2ref[ct][mv31]; \
  
      [ct]setsar=1,split=1[t31];\
  
      [t31]\
  
      drawtext=text='text':x='main_w/2-text_w/2+70':y=210:fontsize="100":fontcolor=black,\
  
      drawtext=text='text2':x='main_w/2-text_w/2+75':y=340:fontsize="100":fontcolor=black,\
  
      rotate=-0.07:ow=rotw(-0.07):oh=roth(-0.07):c=black@0[txta31]; \
  
      [mv31][txta31]overlay=enable='between(t, 0, 1.15)':x='min(0,-H*sin(-0.07))':y='min(0,W*sin(-0.07))':shortest=1" \
  
         ~/Desktop/result.mp4 -y1

  My goal is to write differently rotated texts on different time intervals in the video. The problem is that at about 10-12 [t31]-like pieces(here is an example of only one command), the rendering time of the video is twice the time of the video, whereas drawing straight horizontal text takes about 10-20% of the total video length (examples, for a 1 minute video, it takes about 8-10 seconds to write straight horizontal text, and about 2 minutes to write the same amount of text, but inclined with an angle). Is there any better way to do these multiple rotated text bits with more performance ?

• How to read ip camera(rtsp) frames with python smoothly and without and delay and lagging for a long reading ? [closed]

  22 juillet, par Ayub Alam

  I am working on a client project to count cement bags on a trolley. The setup is as follows : Cement bags are placed on a trolley, which is then loaded into a wagon. During this process, I need to count how many bags are loaded. For this task, I am using the YOLOv11n-seg model.

  


  To capture the video feed, I am reading an IP camera stream via an RTSP link. However, during detection and counting, the frames often lag or delay, disrupting smooth processing. Initially, I tried OpenCV for camera streaming, but it had performance issues. Then, I switched to GStreamer, but the problem persisted. Finally, I attempted FFmpeg, but it still didn’t resolve the latency issue

  


  "As of now, I've tried multiple approaches to read an IP camera's RTSP stream, but I still face delays and lagging issues. I've used GStreamer, FFmpeg packages, and OpenCV, but none of them provide smooth camera reading. On the other hand, VLC and other media players stream very smoothly. Why is this happening ?"