Recherche avancée

Sur d’autres sites (11330)

• Best language to use for AWS Beanstalk worker, for Watermarking videos

  16 juin 2017, par RAJ CHOURASIA

  I have a requirement such that, for each customer, the video content I have has to be separately watermarked and kept in the cloud. Also, this whole process is to be automated.

  The way I have figured the architecture is that :

  • I would use AWS SQS queue, to update for which Customers, which set of videos have to be watermarked
  • AWS Beanstalk worker would read the queue, pick up the videos from a S3 location, watermark the required videos and save back in a separate S3 location

  Total size of all the videos can be upto 15GB, which takes more than 24hrs to watermark, using "ffmpeg", so I will also require

  • Ability to parallel process, use multiple CPU cores if available
  • Ability to auto scale, when required

  In order to achieve this, what would be the best Language to use, to write the AWS Beanstalk worker logic ?

• MoviePy : Concatenating video clips causes weird glitches in final video

  16 mai 2022, par JohnSmithy1266

  Is there a way to successfully always patch up any clips together in such a way that prevents weird glitches ? I put together a .mp4 from smaller .mp4 files and I got a final video with weird glitches. I am running Python 3.6.1 on Windows 10 through Sublime Text 3. I used MoviePy to do the concatenation.

  



  The code :

  



  from moviepy.editor import VideoFileClip, concatenate_videoclips
import os.path

path = "C:/Users/blah/videos/out/"

cliparray = []

for filename in os.listdir(path):
    cliparray.append(VideoFileClip(path + filename))

final_clip = concatenate_videoclips(cliparray)

final_clip.write_videofile(path + "concatenatedvideo.mp4", codec = "libx264")


  



  The weird glitches :

  



  

  1. One of the clips turns into a 3x3 grid of smaller clips.

  


  2. Another has the audio not lined up with the video

  


  3. Another is sped up faster than what was normal.

  


  


• Compression rate (final size) ffmpeg with h263 as codec, can be improved ?

  29 août 2013, par voskyc

  With the following data :

  Sample 1 :
  vcodec : H263
  Duration : 4seconds
  Resolution:1288/720
  FR : 30fps/s
  datarate : 195.135 kB/s
  MP3 : 44HZ, 16bits

  ---

  Size file : 5.84MB.

  Sample 2 :
  vcodec : H263
  Duration : 4seconds
  Resolution:640/480
  FR : 30fps/s
  datarate : 195.135 kB/s
  MP3 : 44HZ, 16bits

  ---

  Size file = 3.34MB.

  Both in flv container.

  Aren't those sizes a little bit high for 4 second video ?

  I believe we are doing some kind of error or missing an optimization.
  Should we decrease the datarate ?
  Maybe we are missing some option for h263 encoding with FFMPEG ?.

  Thanks a lot in advance for your suggestions.

  Note : no, we "can not" use h264. :-)