如何进行时间码计算? [英] How to do timecode calculation?

问题描述

我对计算时间码增量有疑问.
我从电影文件中读取了包含时间码格式为HH:MM:SS:FF

I got a question regarding calculating time code delta.
I read metadata from a movie file containing a timecode formated HH:MM:SS:FF

(FF =框架，例如00->23.因此它类似于00到framerate-1)

(FF = frame, 00->23 for example. So its like 00 to framerate-1)

所以我得到了像15:41:08:02这样的一些数据，并且从另一个参考文件中得到了15:41:07:00
现在，我必须计算时间偏移量(如timedelta，但仅包含帧).
我该怎么做呢?

So i get some data like 15:41:08:02 and from another refrence file i get 15:41:07:00
Now I have to calculate the timeoffset (like timedelta but just with frames).
How would i go around doing this?

推荐答案

framerate = 24

def timecode_to_frames(timecode):
    return sum(f * int(t) for f,t in zip((3600*framerate, 60*framerate, framerate, 1), timecode.split(':')))

print timecode_to_frames('15:41:08:02') - timecode_to_frames('15:41:07:00')
# returns 26

def frames_to_timecode(frames):
    return '{0:02d}:{1:02d}:{2:02d}:{3:02d}'.format(frames / (3600*framerate),
                                                    frames / (60*framerate) % 60,
                                                    frames / framerate % 60,
                                                    frames % framerate)

print frames_to_timecode(26)
# returns "00:00:01:02"

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