一、使用Python自帶的write_videofile

1、函數說明如下：

def write_videofile(self, filename, fps=None, codec=None,bitrate=None, audio=True, audio_fps=44100,preset="medium",audio_nbytes=4, audio_codec=None,audio_bitrate=None, audio_bufsize=2000,temp_audiofile=None,rewrite_audio=True, remove_temp=True,write_logfile=False, verbose=True,threads=None, ffmpeg_params=None,progress_bar=True):"""Write the clip to a videofile.Parameters-----------filenameName of the video file to write in.The extension must correspond to the "codec" used (see below),or simply be '.avi' (which will work with any codec).fpsNumber of frames per second in the resulting video file. If None isprovided, and the clip has an fps attribute, this fps will be used.codecCodec to use for image encoding. Can be any codec supportedby ffmpeg. If the filename is has extension '.mp4', '.ogv', '.webm',the codec will be set accordingly, but you can still set it if youdon't like the default. For other extensions, the output filenamemust be set accordingly.Some examples of codecs are:``'libx264'`` (default codec for file extension ``.mp4``)makes well-compressed videos (quality tunable using 'bitrate').``'mpeg4'`` (other codec for extension ``.mp4``) can be an alternativeto ``'libx264'``, and produces higher quality videos by default.``'rawvideo'`` (use file extension ``.avi``) will producea video of perfect quality, of possibly very huge size.``png`` (use file extension ``.avi``) will produce a videoof perfect quality, of smaller size than with ``rawvideo``.``'libvorbis'`` (use file extension ``.ogv``) is a nice videoformat, which is completely free/ open source. However noteveryone has the codecs installed by default on their machine.``'libvpx'`` (use file extension ``.webm``) is tiny a videoformat well indicated for web videos (with HTML5). Open source.audioEither ``True``, ``False``, or a file name.If ``True`` and the clip has an audio clip attached, thisaudio clip will be incorporated as a soundtrack in the movie.If ``audio`` is the name of an audio file, this audio filewill be incorporated as a soundtrack in the movie.audiofpsframe rate to use when generating the sound.temp_audiofilethe name of the temporary audiofile to be generated andincorporated in the the movie, if any.audio_codecWhich audio codec should be used. Examples are 'libmp3lame'for '.mp3', 'libvorbis' for 'ogg', 'libfdk_aac':'m4a','pcm_s16le' for 16-bit wav and 'pcm_s32le' for 32-bit wav.Default is 'libmp3lame', unless the video extension is 'ogv'or 'webm', at which case the default is 'libvorbis'.audio_bitrateAudio bitrate, given as a string like '50k', '500k', '3000k'.Will determine the size/quality of audio in the output file.Note that it mainly an indicative goal, the bitrate won'tnecessarily be the this in the final file.presetSets the time that FFMPEG will spend optimizing the compression.Choices are: ultrafast, superfast, veryfast, faster, fast, medium,slow, slower, veryslow, placebo. Note that this does not impactthe quality of the video, only the size of the video file. Sochoose ultrafast when you are in a hurry and file size does notmatter.threadsNumber of threads to use for ffmpeg. Can speed up the writing ofthe video on multicore computers.ffmpeg_paramsAny additional ffmpeg parameters you would like to pass, as a listof terms, like ['-option1', 'value1', '-option2', 'value2'].write_logfileIf true, will write log files for the audio and the video.These will be files ending with '.log' with the name of theoutput file in them.verboseBoolean indicating whether to print infomation.progress_barBoolean indicating whether to show the progress bar.

2、使用代碼如下：

from moviepy.editor import VideoFileClipclip = VideoFileClip("myvideo.mp4").subclip(100,120)clip.write_videofile("my_new_video.mp4")clip.close()

二、加載opencv的videoWriter

1、函數說明如下：

videoWriter = cv.videoWriter(video_name, file_format, fps, isColor)

參數說明：

video_name:視頻名稱

file_format:文件格式

fps:幀率

isColor：輸出格式，等于0時輸出灰度視頻，不等于0時輸出彩色視頻

2、使用代碼如下：

import cv2 as cv# 調用攝像頭 videoCapture = cv.VideoCapture(0) # 設置幀率 fps = 30 # 獲取窗口大小 size = (int(videoCapture.get(cv.CAP_PROP_FRAME_WIDTH)), int(videoCapture.get(cv.CAP_PROP_FRAME_HEIGHT)))# 設置VideoWrite的信息 videoWrite = cv.VideoWriter('MySaveVideo.avi', cv.VideoWriter_fourcc('I', '4', '2', '0'), fps, size)# 先獲取一幀，用來判斷是否成功調用攝像頭 success, frame = videoCapture.read() # 通過設置幀數來設置時間,減一是因為上面已經獲取過一幀了 numFrameRemainling = fps * 5 - 1 # 通過循環保存幀 while success and numFrameRemainling > 0:videoWrite.write(frame)success, frame = videoCapture.read()numFrameRemainling -= 1 # 釋放攝像頭 videoCapture.release()

參考：https://blog.csdn.net/li_l_il/article/details/83616586

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