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Sur d’autres sites (10478)

  • How to remove 6 seconds and keep the next 20 seconds of both video and audio and repeat it with ffmpeg

    16 juillet 2018, par Adam Estel

    I tried to figure a way to to remove 6 seconds of both video and audio every 20 seconds.This is my code :

      ffmpeg -y -i "input.mp4" -vf "select='not(lt(mod(t,20),6))',setpts=N/FRAME_RATE/TB,setpts=PTS-STARTPTS" -af "aselect='not(lt(mod(t,20),6))',asetpts=N/SR/TB,asetpts=PTS-STARTPTS" -preset superfast out.mp4

    But it resulted not that I want,the wrong timings being selected.
    I don’t know what did i do wrong here ?
    Sorry for my bad english.Thank you

  • I'm trying to dynamically call to a folder based on path of my program

    29 juin 2020, par Jessie Wilson

    I have been working on this for a couple days and I feel like I'm going about it wrong.

    


    Say my .py program is is Desktop/TEST.
The executable I want to run is in Desktop/TEST/ExampleProgram
I want to be able to call example.exe and send CLI commands to it out of the above folder.

    


    I can do this easily if I hardcode the paths into the program. I need to know how to dynamically change this path depending on where the my program is unpacked. (I'll be using pyinstaller to turn the main .py into a .exe)

    


    I have tried doing this with ("%s" % path.abspath(path.curdir)) paired with the subprocess module. However, I feel like this is wrong. Any help would be apprecaited !

    


  • How to improve Video Trimming & Merging Performance for Mobile App [closed]

    5 mai 2024, par Harpreet Singh.8052

    I am in the process of developing an app that will allow users to trim and merge recorded videos similar to Snapchat and Instagram stories. Currently, I am using FFmpeg for video processing, but it is taking too long to complete. I have come up with an idea to use ExoPlayer to minimize processing time. My plan is to store the trimmed duration of multiple videos and only play the trimmed part when the video is played. ExoPlayer allows playing multiple videos seamlessly, so it will appear as if the videos have been trimmed and merged. However, I am uncertain about how to handle video playback on the server-side when a user uploads all the videos and metadata about the video, such as the trimmed part from where to where they want to play. If I follow this approach, I will need to first get all the videos to the user's device before playback, but the videos can be long, ranging from 10 to 30 minutes, making this approach impractical. I would like to play them in a video stream manner. 

    


    I am also curious about how other video editing apps such as CapCut or Kinemaster handle video processing tasks like trimming, merging, and slow-mo. What video processing tools do they use ? When I tried merging ten one-minute videos, it took around 10 minutes on my Android phone, but these editing apps take less time. 

    


    I would appreciate any approach or idea to improve the processing time for video trimming and merging

    


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