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• FFmpeg move overlay from one pixel coordinate to another

  22 mai 2015, par occvtech

  I’m trying to write a command within FFmpeg that will first overlay one video stream on top of another one. Then I want the overlayed video to move from one pixel coordinate at a known time, and end at another pixel coordinate at a later time.

  I’m comfortable with the basics of the -filter_complex, but I cannot figure out how to apply any arithmetic expressions - like the one’s referenced here : https://www.ffmpeg.org/ffmpeg-utils.html#Expression-Evaluation

  Here’s an example of something I’d like to accomplish.

  ffmpeg -i [INPUT1] -i [INPUT2] -filter_complex "[0:v][1:v]overlay=shortest=1:x=720:y=0:enable='between(t,10,20)'[overlay];...

  In this example the overlay is stationary at pixel coordinate 720x0 from the 10th second to the 20th second.

  However, Id like to have it move to a new location in a linear fashion and end at a different pixel coordinate.

  For example, during that 10 second overlay, I’d like to have it start at 720x0, but then end at 1000x100.

  Is this possible ?

• Writing subtitles on a video on different time frames

  22 mars 2023, par sarveshsta

  I am trying to write subtitles on a video. The problem is , with cv2(opencv-python), I am unable to write text on different time frames , lets say for first two seconds I want "Hello", and for another 3 seconds the video will show "this is the introduction" and so on.

  


  My question is, how can I achieve this with opencv-python. The thing why I want to use cv2 only is it creates an object for that video and do not create a new file, and that is important for my project.

  


  If you guys have any idea how we can write subtitles on a video without creating another file, please do let me know.

  


  I also tried ffmpeg it worked absolutely fine for me and I used a .srt file for that, but again it was creating a new file and same happened with moviepy library so in any case if you could show me a way how can we overwrite the file in ffmpeg or moviepy, it would be very helpful.

  


  THANKS.

  


• Trim Video Functionality in an android App

  20 juillet 2020, par sns

  I want Trim Video Functionality in an android App. I have gone through different post and references but did not found any suitable solution. Can you please tell me any open source repository link ? I would prefer FFMPEG Lib for trim video.

  



  The only source I found is : https://github.com/uday-rayala/video-trimmer, However it doesn't show video thumbnails like Vine/Instagram/vivavideo etc.

  



  I want to show video thumbnails while trimming video, as shown in below screen shot.

  



  Any help would be greatly appreciated. Thanks