Audio/Video desync when framerate is not an integer

[Max6mm]

When using a driving video with non integer framerate , 29.97 FPS in my case, LivePortrait round it to 29 FPS.
It create an audio/video desync which become more important the longer the video is.

[cleardusk]

A temporary solution is use change_video_fps to change the FPS of the original video to an interger, e.g., 30

LivePortrait/src/utils/video.py

Lines 133 to 135 in 7f755d9

	def change_video_fps(input_file, output_file, fps=20, codec='libx264', crf=12):
	cmd = f'ffmpeg -i "{input_file}" -c:v {codec} -crf {crf} -r {fps} "{output_file}" -y'
	exec_cmd(cmd)