To make a constant frame rate MP4 video into a variable frame rate using Python.
Currently, this script is designed for a video generated from OpenCV-Python libraly. So, you need some modification to use it for other MP4. (If I notice this is useful for others too, I will try to modify this.)
At first, you need to prepare timecodes.txt, which has time-stamp data for each frame in timecodes_v2 format.
Here is an example;
0
20
50
70
100
...
In this case, each frame will be played like 1st frame at 0 ms, 2nd frame at 20 ms, 3rd frame at 50 ms, ... . And, the gap between 2 frames will be the displayed duration for the first one.
Next, please edit first 3 lines accorfing to your files. These lines are like below;
videoFilename = './video.mp4'
outputFilename = './testVFR.mp4'
timecodesFilename = './timecodes.txt'
, where videoFilename is a path to MP4 video, outputFilename is a path for result MP4, and timecodesFilename is the one you made. Please note the number of timecodes in timecodes.txt has to be same as frames in your video.
Finally, you can run this script! Run python EditMP4.py, you will get result!
I used https://github.com/AiueoABC/CompressedVideoGenerationExample to generate video for this.
Please open issue to let me know about any comments, suggests, and requests.
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