Sur d’autres sites (7640)

• PyGame video get out of sync

  8 novembre 2020, par jas_123

  So, I want to make a video player that plays the video and the audio in sync. I also don't want to use ffmpeg because I would like to make my script not need a dependency of ffmpeg and force my friends to install ffmpeg to their computer and set the path and stuff. So right now my code is :

  


  from moviepy.editor import *
import pygame

pygame.display.set_caption('Hello World!')

clip = VideoFileClip('yeetus.mp4')
clip.preview(fps=30)

pygame.quit()


  


  (From How can I play a mp4 movie using Moviepy and Pygame)

  


  When I try to move the window somewhere else it freezes right and the audio kinda just iterates in a specific timestamp. But when you stop dragging it, the audio plays where it was, but the video is out of sync. Is there a fix to this issue ? If not, is there an alternative ? Thanks

  


  edit : still open to answers btw

  


• Why is ffmpeg cut setting the wrong duration on my output file

  9 mai 2023, par danielson317

  Setup

  


  I am trying to break a video up into parts using some basic commands I have seen available.

  


  I have tried :

  


  ffmpeg -ss 00:00:00 -t 00:11:42 -i 'original.m4v' -acodec copy -vcodec copy 'output.m4v'

  


  I also tried more generic (and much slower) :

  


  ffmpeg -ss 00:00:00 -t 00:11:42 -i 'original.m4v' 'output.m4v'

  


  I am on Ubuntu 20 with ffmpeg 4.2.7-0. I know it is a little outdated but this computer lost it's network card so I cannot update it at this time.

  


  The problem

  


  In both cases the video cuts correctly to only have the first 11:42. However the video properties state the video is 31 minutes long (the length of the original). This file size also reflects the reduced size I would expect from the cut. When I play the video in VLC it reports the video is 31 minutes long but scanning or playing past 11:42 "crashes" the playback.

  


  Question

  


  Why is the new video reporting the wrong length and how do I correct this ? Preferably in the conversion process not a secondary command.

  


• FFMpeg AC3 to AAC Conversion speed

  28 juillet 2022, par sweetngx

  While I don't actually have a problem with conversion, I do have a direct problem with Conversion speed. With FFMpeg, I convert ac3 (175 mb) audio files to aac (70mb) format in about 2 minutes by consuming very little cpu (5%).
I couldn't find a way to achieve this even though it's really great on my computer, I guess the problem is software... Do you think there is a way to achieve this ?
I have a lot of questions in my mind, why can't FFMPeg speed up this process at the expense of consuming more cpu, What is the obstacle ?

  


  I think I found someone having similar issue at the link below... Anyone have a better idea ?
https://forums.developer.nvidia.com/t/nvenc-with-audio-conversion-best-practice-advice/40759

  


  ffmpeg.exe -threads 32  -i "en.ac3" -map a:0 -c:a aac -b:a 128k -vn -y output.aac