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• Seeking CLI Tool for Creating Text Animations with Easing Curves [closed]

  15 novembre 2023, par anonymous-dev

  I'm working on a video project where I need to animate text using various easing curves for smooth and dynamic transitions with the terminal. Specifically, I'm looking to apply the following easing curves to text animations :

  


  bounceIn
bounceInOut
bounceOut
decelerate
ease
easeIn
easeInBack
easeInCirc
easeInCubic
easeInExpo
easeInOut
easeInOutBack
easeInOutCirc
easeInOutCubic
easeInOutCubicEmphasized
easeInOutExpo
easeInOutQuad
easeInOutQuart
easeInOutQuint
easeInOutSine
easeInQuad
easeInQuart
easeInQuint
easeInSine
easeInToLinear
easeOut
easeOutBack
easeOutCirc
easeOutCubic
easeOutExpo
easeOutQuad
easeOutQuart
easeOutQuint
easeOutSine
elasticIn
elasticInOut
elasticOut
fastEaseInToSlowEaseOut
fastLinearToSlowEaseIn
fastOutSlowIn
linearToEaseOut
slowMiddle


  


  My initial thought was to use ffmpeg for this task, however, it appears that ffmpeg may not support these advanced easing curves for text animation.

  


  I am seeking recommendations for a command-line interface (CLI) tool that can handle these types of animations.

  


  Key requirements include :

  


  

  • Easing Curve Support : The tool should support a wide range of easing curves as listed above.

  


  • Efficiency : Ability to render animations quickly, preferably with performance close to what I can achieve with ffmpeg filters.

  


  • Direct Rendering : Ideally, the tool should render animations in one go, without the need to write each individual frame to disk.

  


  • Should work with transformations such as translate, scale and rotate. For example a text translates from a to b with a basing curve applied to the transition.

  


  


  I looked into ImageMagick, but it seems more suited for frame-by-frame image processing, which is not efficient for my needs.

  


  Could anyone suggest a CLI tool that fits these criteria ? Or is there a way to extend ffmpeg's capabilities to achieve these animations ?

  


• Combine video and audio with moviepy in mobile app

  18 novembre 2023, par GoodGameCrafter

  import moviepy.video.io.ffmpeg_tools as mvp
def Merge(self,title:str):  # Kombiniert die Video und die Audiodatei
    self.percent.text = "Verarbeiten..."
    os.rename(f"{self.outpath}/{title}.mp4", f"{self.outpath}/tmp_video.mp4")
    os.rename(f"{self.outpath}/{title}.mp3", f"{self.outpath}/tmp_video.mp3")
    mvp.ffmpeg_merge_video_audio( f"{self.outpath}/tmp_video.mp4",  f"{self.outpath}/tmp_video.mp3",
                                 f"{self.outpath}/{title}.mp4")
    os.remove(f"{self.outpath}/tmp_video.mp4")
    os.remove(f"{self.outpath}/tmp_video.mp3")


  


  I want to combine video and audio with moviepy in a kivy app on Android.I tried to build the app with the following requirements : python3,kivy,Pillow,typing_extensions,requests,urllib3,android,moviepy,imageio,Decorator,tqdm,numpy,imageio_ffmpeg,ffmpeg,proglog

  


  The app crashes and when i set the environmental variable with

  


  import os
os.environ["IMAGEIO_FFMPEG_EXE"] = "/usr/bin/ffmpeg"


  


  it does build the app but crashes when i try it out.
Is there something that I am missing or is it not possible to build this type of app ?

  


• Can ffmpeg trim the beginning of a video as it's written ?

  3 janvier 2024, par ttshaw1

  I'm working on an Android app where I want to keep a 30s buffer of video, and at arbitrary times save it. I have a few requirements :

  


  

  • I want to make sure I don't miss or duplicate any frames. So I think periodically starting and stopping recording won't work

  


  • I found that simultaneously encoding two video streams puts my CPU under a lot of strain, so I want to avoid doing that

  


  • I don't want to store a ring buffer of 30s worth of frames in memory as that'll require too much memory. So I think I need to encode them to a video file on disk as they come in. (though I'm realizing maybe I could write the frames to disk and encode them when I have a 30s buffer I want to keep)

  


  


  This all leads me to think the best solution would be something like a typical camera app where a video is written to an mp4 file as it's recorded. But to keep the filesize reasonable, I'd like to have the output file continuously trimmed to the last 30s, plus or minus a keyframe interval.

  


  I know that ffmpeg can do that for a video that's not being currently written. But I don't know if something about the format of an mp4 would prevent doing that for a video that is being written. For example, if an mp4 was essentially a series of bitmaps with timestamps, I'd think it's easy for ffmpeg to chop off some number of frames at the beginning while the camera API is writing frames to the end. Is there anything about the mp4 format that makes it too complicated to do that in practice ? Or is this a question that depends on the camera API's implementation ?