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• Video not saving when I use the fourcc 'X264'

  14 mars 2021, par user42

  I'm new to opencv and ffmpeg so I don't know if this is a noob question. I'm writing a video with the following statement :

  


  out = cv2.VideoWriter('videoname.mp4', cv2.VideoWriter_fourcc(*'X264'), 10, (frame_width, frame_height))

  


  My program runs however, the video does not save. I tried looking for solutions online but none of them seem to work. What I have already tried :

  


  

  1. It works correctly when I used *'XVID' or *'MJPG' but the file size is larger than what I require.

  


  2. Using 0x00000021 as the fourcc argument

  


  3. Trying variations of x264, X264, H264, h264 as I read it might be case sensitive. This also does not work.

  


  4. Specifying the channel when installing ffmpeg with the command conda install -c conda-forge ffmpeg (even though I already have built ffmpeg from source, I tried this)

  


  5. Trying to install x264 using sudo apt-get install ffmpeg x264 libx264-dev. I get the following result :

  


  


  Reading package lists... Done
Building dependency tree       
Reading state information... Done
libx264-dev is already the newest version (2:0.152.2854+gite9a5903-2).
x264 is already the newest version (2:0.152.2854+gite9a5903-2).
ffmpeg is already the newest version (7:3.4.8-0ubuntu0.2).
0 upgraded, 0 newly installed, 0 to remove and 82 not upgraded.


  


  Can someone help me where I could possibly be going wrong ? I require the video codec to be x264 when saving the video to get a small file size.

  


  Other info :
OpenCV version used : 4.2.0
Platform : Ubuntu 18.04

  


• is it necessary in Anaconda for Matplotlib to install ffmpeg for animation saving ?

  2 mai 2018, par Vasyl Kolomiets

  For animation saving I have read some propositions
  1) manual installing ffmpeg this way :

    conda install -c conda-forge ffmpeg

  2) manual installing ImageMagick and changing matplotlib configuration file "matplotlibrc" this way :

  #animation.ffmpeg_args: ''         # Additional arguments to pass to ffmpeg
  
  #animation.avconv_path: 'avconv'   # Path to avconv binary. Without full path
  
                                     # $PATH is searched
  
  #animation.avconv_args: ''         # Additional arguments to pass to avconv
  
  #animation.mencoder_path: 'mencoder'
  
                                     # Path to mencoder binary. Without full path
  
                                     # $PATH is searched
  
  #animation.mencoder_args: ''       # Additional arguments to pass to mencoder
  
  #animation.convert_path: 'convert' # Path to ImageMagick's convert binary.
  
  animation.convert_path: F:\Games\ImageMagick-7.0.7-Q16\magick.exe
  
                                     # On Windows use the full path since convert
  
                                     # is also the name of a system tool.

  where line with pass to installed ImageMagick was added manually

  animation.convert_path: F:\Games\ImageMagick-7.0.7-Q16\magick.exe

  Two questions :
  1 - what way is better for Anaconda ?
  2 - really Anaconda has no better way ????

• avcodec_encode_video2 coding gets H264 video frames, sent through live555 services, VLC playback, unable to display

  2 mars 2018, par donghui.R

  avcodec_encode_video2 encoding to get AVPacket H264 video frames, live555 RTSP stream service sent, client VLC play, can not be displayed. But the direct preservation of AVPacket H264 video frames is H264 files, which can be played with VLC, but it is very fast. Do not know if I need to deal with H264 video frames more closely ??