Recherche avancée

Sur d’autres sites (9739)

• How to add transition effects like fade in, fade out, slide in, etc, to a video [on hold]

  31 mai 2018, par Janhavi Savla

  I am trying to add crossfade effect to a series of images ina folder and then create a video but I am getting an error :’tuple’ object has no attribute ’crossfadein’.
  How should I resolve it ?
  Here’s the code :

  from moviepy.editor import *
  
  import os
  
  
  
  delay =1
  
  H = 720
  
  W = 1280
  
  output = "out.mp4"
  
  path = "/Users/test/Desktop/Image_test_data/testdata2"
  
  dirs = os.listdir( path )
  
  ext = '.jpg'
  
  clips=[]
  
  images = [img for img in os.listdir(path) if img.endswith(ext)] 
  
  
  
  for image in images:
  
      img=ImageClip(path+'/'+image).set_duration(2).resize(height=H,width=W)
  
      clips.append(img)
  
  
  
  final = concatenate([clip.crossfadein(delay) for clip in enumerate(clips)],
  
       padding=-delay, method="compose")
  
  
  
  final.write_videofile(output,fps=24, audio_codec="aac")

• Implementing hardware accelerated decoding on windows with FFMPEG

  24 juillet 2019, par sacha legrand

  Intel processor incorporates hardware acceleration capabilities for video encoding / decoding.

  I use :

  Intel 5 series HD graphics & Processeur Intel Core i7-620UE

  and/or

  Intel Gen9 HD Graphics Engine & Processor Intel Core i7-6600U

  So wich hardware acceleration should I use (H264, VC1, H265, etc.) to be more efficient ?

  The FFMPEG library provides everything you need to perform decoding.

  We accessed these hardware acceleration features by default ?

  Should I use a specific API or library ?

  I finnally find in
  https://trac.ffmpeg.org/wiki/HWAccelIntro
  It is Libmfx how seems the best for my case (Windows & Intel)

  Am I on the right way ?

  I should explaine all the possibility so if you have any other doc about that it’s could be cool.

  Thank you

• Merge audio (m4s) segments into one

  20 avril 2022, par akinuri

  I recently started learning Laravel, and currently watching an online course. Online courses are fine, but I like to have local copies, so I'm trying to download/merge segmented audio from Laracasts : Laravel 8 From Scratch series.

  


  I've written some scripts (in Python) that does the following :

  


  

  1. Download the master.json

  


  2. Read master.json and download audio segments

  


  3. Merge the segments into a single file (the file is not playable yet)

  


  4. Process the audio file via ffmpeg (now it's playable, but has issues)

  


  


  I think there's a problem with the step 3 and/or 4.

  


  In step/script 3, I create a new file, and add the contents of the segments to the file in binary.

  


  Then (step/script 4), run a ffmpeg command in python : ffmpeg -i merged-file.mp4 -c copy processed-file.mp4

  


  However, the final file doesn't work/play as expected. There's a delay in the beginning, and some parts seem to be cut off/skipped.

  


  There are three possibilities :

  


  

  • Segment files are problematic (not likely ?)

  


  • I'm doing the merging wrong

  


  • I'm doing the ffmpeg processing wrong

  


  


  Can someone guide me here ?

  


  ---

  


  The issues/colored parts in the ffmpeg output are :

  


  ...
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001cfbc0de780] could not find corresponding track id 2
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001cfbc0de780] could not find corresponding trex (id 2)
...
[aac @ 000001cfbc0f0380] Number of bands (31) exceeds limit (6).
...
[mp4 @ 000001cfbc20ecc0] track 0: codec frame size is not set
...
[mp4 @ 000001cfbc20ecc0] Non-monotonous DTS in output stream 0:0; previous: 318318, current: 286286; changing to 318319. This may result in incorrect timestamps in the output file.
...


  


  Everything required for a test case is located in GitHub (akinuri/dump/m4s-segments/). Screenshot of the contents :

  


  

  


  ---

  


  Note : there are two types/formats of audio in the master.json : mp42 and dash. dash works as expected, and seem to be used in limited videos/courses. On the other hand, mp42 appears more. So I need a way to make mp42 work.