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Concatenate Videos by List (with CPU Limiting)

Description​

The concatenate_videos_by_list2 function concatenates multiple videos listed in a text file into a single output video, using ffmpeg. It also limits the CPU usage of the ffmpeg process to 50% using the cpulimit utility. The list file must contain the paths of the video files to be concatenated.

Function Signature:​

def concatenate_videos_by_list2(list_file_path: str, output_file_path: str):

Parameters​

  • list_file_path (str): The file path to the text file that contains the list of video paths to concatenate.
  • output_file_path (str): The file path where the concatenated video will be saved.

Returns​

  • None

Example Usage​

concatenate_videos_by_list2('video_list.txt', 'output_video.mp4')

Notes​

  • The list file (list_file_path) should be formatted such that each line contains a path to a video file in the format file 'path_to_video'.
  • The function uses ffmpeg with the -f concat and -safe 0 options to concatenate the videos listed in the provided text file.
  • The -c copy option is used to copy the video streams without re-encoding them, preserving the original video quality.
  • The -y option automatically overwrites the output file if it already exists.
  • The cpulimit utility limits the CPU usage of the ffmpeg process to 50%, which can be useful if you want to avoid overloading the system during video processing.

Error Handling​

  • If an error occurs during the execution of the cpulimit or ffmpeg command, a subprocess.CalledProcessError is caught, and an error message is printed to the console.