来自不均匀的png图像序列的ffmepg视频 [英] ffmepg video from uneven sequence of png images

问题描述

我将根据一系列屏幕截图(.png 文件)制作视频.对于每个屏幕截图，都有有关其拍摄时间的相关时间戳信息.屏幕截图之间的时间间隔可能会有所不同，因此非常希望在视频中保留这种差异.

I'm going to make a video from series of screenshots (.png files). For each screenshot there is assosiated timestamp information about when it was taken. The time intervals between screenshots may vary and it's highly desired to preserve that difference in the video.

有没有办法使用单个 ffmpeg 命令/API 为其提供图像 + 时间(或帧)偏移序列并获取一个视频文件作为输出?现在我必须为每个图像生成自定义长度的短视频文件，然后手动合并它们:

Is there a way to use single ffmpeg command/API providing to it sequence of image + time (or frame) offset and getting one video file as output? By now I have to generate short video files of custom length for each image, and then merge them manually:

ffmpeg -y -loop 1 -i image1.png -c:v libx264 -t 1.52 video1.avi
ffmpeg -y -loop 1 -i image2.png -c:v libx264 -t 2.28 video2.avi
...
ffmpeg -y -loop 1 -i imageN.png -c:v libx264 -t 1.04 videoN.avi


ffmpeg -i "concat:video1.avi|video2.avi|...videoN.avi" -c copy output.avi

这很好，虽然间隔很大，但整个方法在我看来有点脆弱.

This is quite ok, while intervals are large, but the whole approach seems to me a bit fragile.

推荐答案

使用 concat demuxer.

_{使用 2、4 和 0.25 秒的示例.}

1. 制作一个文本文件，指明每个文件所需的持续时间:

1. Make a text file indicating the desired duration per file:

file 'image1.png'
duration 1.52
file 'image2.png'
duration 2.28
file 'image3.png'
duration 1.04

您可能需要重复最后的 file 和 duration 行以使其显示最后一帧.

You may have to repeat the last file and duration lines to get it to display the last frame.

运行 ffmpeg 命令:

ffmpeg -f concat -i input.txt -c:v libx264 -pix_fmt yuv420p -movflags +faststart output.mp4

这篇关于来自不均匀的png图像序列的ffmepg视频的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！