For a web video that can be downloaded in segments, it is possible to create an overview of the video by downloading only a small amount of binary data.

Explanation of Fundamentals

requirements

Python 3.6+
ffmpeg

Note

This is a very simple script that I wrote for my own use. It is not a complete program. If you want to use it, you need to modify the code yourself.

Currently, only H264 encoded MP4 files are supported, and due to the complexity of the MP4 file format, the code is not very robust, many MP4 files may not be supported at present.

Usage

First, you need to modify the web video url in main.py and run the script. The script will generate a thumbnail image.

Supported video format

MP4

only one sample in a chunk
mutiple samples in a chunk
I frame with SEI
mutiple NALU in a sample (slices = n) : more infomation