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• Final results of ffmpeg installation are libraries with missing links

  17 avril 2017, par Mikasa

  [poster@localhost lib]$ ldd libavfilter.so
  
      linux-vdso.so.1 =>  (0x00007ffc6bbd0000)
  
      libswscale.so.4 => not found
  
      libpostproc.so.54 => not found
  
      libavformat.so.57 => not found
  
      libavcodec.so.57 => not found
  
      libswresample.so.2 => not found
  
      libavutil.so.55 => not found
  
      libm.so.6 => /lib64/libm.so.6 (0x00007fc796d79000)
  
      libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fc796b5c000)
  
      libc.so.6 => /lib64/libc.so.6 (0x00007fc79679b000)
  
      /lib64/ld-linux-x86-64.so.2 (0x00007fc79742b000)
  
  [poster@localhost lib]$ ldd libswscale.so
  
      linux-vdso.so.1 =>  (0x00007ffe29572000)
  
      libavutil.so.55 => not found
  
      libm.so.6 => /lib64/libm.so.6 (0x00007f4cfdea3000)
  
      libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f4cfdc87000)
  
      libc.so.6 => /lib64/libc.so.6 (0x00007f4cfd8c6000)
  
      /lib64/ld-linux-x86-64.so.2 (0x00007f4cfe442000)

  All of them are like that.
  I’m a newb and don’t know how to solve this. They’re right next to each other.
  Any suggestion is appreciated. Thank you.

• 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. :-)

• 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.