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• How to fix error FFmpeg "Error during encoding : failed to allocate memory (-4)"

  22 avril 2022, par SCAR101

  I have a problem with FFmpeg encoding. It can write for an hour or two hours or 5 minutes, and then he gives out error : [h264_qsv @ 000001a47094f340] Error during encoding: failed to allocate memory (-4). What am I doing wrong ? Here is the FFmpeg string :

  


  -y -f dshow -video_size 1920x1080 -rtbufsize 702000k -framerate 25 
-i video="Decklink Video Capture":audio="Decklink Audio Capture
-vf "drawtext=fontfile=C\\:\\\\Windows\\\\Fonts\\\\arial.ttf:fontsize=36:fontcolor=red:text='%{localtime}'" 
-s 720x540 -pix_fmt yuv420p -c:v h264_qsv 
-preset veryfast -b:v 512k -acodec libmp3lame 
-b:a 96k -ac 2 -ar 44100 D:\Input_1\2022\4\20\Input_1_20.04.2022_08.16.31.mkv


  


  Computer Specifications : Core I5 11600, 16Gb.

  


• OpenCV3.3.1 fails to read a video

  1er janvier 2018, par Kasparov92

  Here is the code I use

  file_name = 'movie.avi'
  
  cap = cv2.VideoCapture(file_name)
  
  
  
  success, frame = cap.read()
  
  
  
  i = 0
  
  
  
  while success:
  
      i +=1
  
      success, frame = cap.read()
  
  
  
  print "Frames successfully read:", i

  And I am getting this error :

  Unable to stop the stream: Inappropriate ioctl for device
  
  
  
  (python:139873): GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  
      Frames successfully read: 0

  On this particular video, it fails to read ! I tried the same code on other videos and they work fine. I also tried the same piece of code with another laptop (same operating system : Ubuntu 16.04) and it works.

  Is it a codec issue ? if so why other videos could be loaded and read successfully ?

  EDIT 1 :

  I recompiled opencv using -DWITH_LIBV4L=ON after sudo apt-get install libv4l-dev and Now I am getting this error :

  Failed to query video capabilities: Inappropriate ioctl for device
  
  libv4l2: error getting capabilities: Inappropriate ioctl for device
  
  VIDEOIO ERROR: V4L: device /root/datasets/UCF-101/TableTennisShot/v_TableTennisShot_g22_c02.avi: Unable to query number of channels
  
  
  
  (python:173084): GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed

• FFMPEG merge one audio and one video file [duplicate]

  29 mars 2020, par Karl R

  I am trying to get this to work for a few hours and am having no luck. I have two .mp4 files - one is audio and one is video. All I want to do is merge them into one file so the audio and video play together. I know I am close but I keep getting stuck on "Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_hstack_0".

  My command I am using is :

  .\ffmpeg.exe -y -i .\camera.mp4 -i .\screen.mp4 -filter_complex hstack output.mp4

  Output of each file type is attached.

  Thank you for your help - we found a bug in a screen recording app on our AMD laptops and this will helps us with a temporary fix. I work at a tech college and we are scrambling to get online videos going for the students to learn remotely.
  pic1
  pic2