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• Creating uncompressed video files from sequences of images with partial looping

  18 septembre 2021, par Ethan Kendrick

  I have multiple sequences of 7 images. I would like to encode these 7 images into a 10 fps video file that cycles through the first 4 images in the first 4 frames, and then repeats the rest of the images in a looping order for a total of n frames. For example, a 32-frame video file as follows :

  


  12345676567656765676567656765676

  


  Is there a way to predetermine the order of the 7 frames, including duplicates (the repetition of images 5, 6, and 7) ?

  


• reduce moviepy processing time

  3 septembre 2021, par Mahesh

  I'm adding image & text to a video at a particular time only, this is the only change I'm doing to the video. But in the moviepy progress bar I can see that it goes over the rest of the frames in video even after the specified timeline. Probably this extra processing is causing it to take much more time than just the code specified changes.

  


  Is there a way I can tell moveipy to ignore rest of the video & close the video file and exit ? this way probably it'll perform faster.

  


  Please also indicate if there is any other ways to speed up the performance of moviepy ?

  


• Losing video when splitting mpg from middle [migrated]

  12 avril 2014, par ARip1979

  Very new to ffmpeg so bear with me.

  I'm trying to split an mpg in two pieces. It's a 4m 36s video. I want the first piece to be 170s and the second to be the rest. I have tried a bunch of different methods.

  ffmpeg -i input.mpg -vcodec copy -acodec copy -ss 00:00:00 -t 00:2:50 output1.mpg
  
  ffmpeg -i input.mpg -vcodec copy -acodec copy -ss 00:02:50 output2.mpg
  
  
  
  ffmpeg -i input.mpg -t 170 -c copy output1.mpg -ss 170 -c copy output2.mpg

  And a bunch of others. Every thing I've tried gives me a great first output1.mpg but output2.mpg is always missing the video. The file is saved as .mpg but it is only audio.

  I found one option that said to try this for the 2nd piece.

  ffmpeg -ss 170 -i input.mpg -t 176 -c copy output2.mpg

  and that sometimes there are errors so to try :

  ffmpeg -ss 170 -i input.mpg -t 176 output2.mpg

  With the possibility that omitting '-c copy' might result in a good output.
  So the first one above with '-c copy' gave me the same result, no video. The second option resulted in video and audio but the video was severely degraded in quality.

  Can anyone help me ? Why do I keep losing the video on the 2nd piece. I'm a newb but this seems pretty straight forward.

  Thanks in advance !