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• Cannot install ffmpeg [closed]

  22 mai 2022, par Ashok M

  I'm trying to learn video processing using Python. For that, I tried installing one of two packages using Homebrew : ffmpeg and ImageMagick. After upgrading and updating Homebrew, I ran the command : brew update && brew install ffmpeg. Below is the error I got before some downloads started :

  


  ERROR :

  


  xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun


  


  After all downloads completed, another error came up as shown below :

  


  Error: python@3.9: the bottle needs the Apple Command Line Tools to be installed.
  You can install them, if desired, with:
    xcode-select --install
You can try to install from source with:
  brew install --build-from-source python@3.9
Please note building from source is unsupported. You will encounter build
failures with some formulae. If you experience any issues please create pull
requests instead of asking for help on Homebrew's GitHub, Twitter or any other
official channels.


  


  I'm on MacOSx with Python 10.4 installed. Don't if that's making any difference to the installation. Thanks for any help.

  


• webm to mp4 without loosing audio video sync

  9 avril 2018, par Kishore

  Iam trying to covert webm to mp4 using ffmpeg so that the output file is playable in all browsers.

  Iam using this ffmpeg command in ubuntu

  ffmpeg -i inpput.webm -f mp4 -copyts -vcodec libx264 -strict -2 -vf scale="380:-2" -pix_fmt yuv420p -profile:v baseline -level 3 output.mp4 

  It is converting the file to mp4 but that file is out of sync in Mac safari browser and chrome browser. Means the audio and video is not syncing and sometimes the video gets stopped in between and audio goes on.

  If I play the input.web media file directly in chrome it is playing perfectly fine, the same input.webm is also playing good with firefox. But the converted mp4 is out of sync in safari on mac and all chrome browsers.

  However if the output.mp4 is played on ipad safari it is playing fine.
  The Mac safari version I tried is 11.03
  iPad safari version is 11.3

  Firefox and chrome are all latest.

  firefox : 59.0.2(64 bit),
  chrome : 65.0.3325.181 (Official Build) (64-bit)

  Please help me out with what Iam doing wrong.

  Thanks in advance.

• OpenCV error : [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls

  2 mai 2015, par Relax Wu

  I installed OpenCV in Ubuntu according to the official guide, then I’m trying to decode a file, then error occurs :

  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!

  the video is about 150 frames, the error log may exceed 1000, can someone help me here ? thanks.