逐帧创建运动JPEG帧率可变 [英] Creating a Motion JPEG frame by frame with variable frame-rate

问题描述

我正在分析一些我手头存在的问题的解决方案：我正在从设备接收图像，我需要从中创建一个视频文件。然而，图像到达之间有一些随机的延迟，我正在寻找最好的方法来编码这个。我必须逐帧创建这个视频，并且在每一帧之后，我必须有一个新的视频文件与新的帧，替换旧的视频文件。

I'm analyzing a number of solutions to the problem that I have in hand: I'm receiving images from a device and I need to make a video file out of it. However, the images arrive with a somewhat random delay between them and I'm looking for the best way to encode this. I have to create this video frame by frame, and after each frame I must have a new video file with the new frame, replacing the old video file.

我在想将帧速率固定在比我可能得到的最小延迟稍微更快，并重复最后一帧，直到新的帧到达，但我猜这个解决方案不是最优的。

I was thinking of fixating the frame-rate a little "faster" than the minimum delay that I might get and just repeat the last frame until a new one arrives, but I guess that this solution is not optimal.

此外，这个项目是用Delphi制作的（不，我不能改变），我需要手段在每帧后将这些帧转换成视频文件。我正在考虑使用 mencoder 作为外部工具，但我正在阅读文档和仍然没有找到一个选项，使其在已编码的Motion JPEG视频文件中插入一帧。由于我的图像以JPEG格式输入，我认为使用Motion JPEG是合理的，但即使这样也是确定的。此外，我不知道mencoder是否可以用作图书馆。

Also, this project is made with Delphi (no, I cannot change that) and I need means to turn these frames into a video file after each frame. I was thinking about using mencoder as an external tool, but I'm reading the documentation and still haven't found an option to make it insert a frame in an already encoded Motion JPEG video file. As my images come in as JPEG, I thought that it would be reasonable to use Motion JPEG, but not even this is certain yet. Also, I don't know if mencoder can be used as a library. It would help a lot if it did.

你会建议什么？

推荐答案

有些媒体容器格式支持可变帧速率，但我不认为MJPEG是一个很好的选择，因为存储开销。我相信最好的办法是使用I帧和P帧将JPEG帧转码为MP4格式。

There are some media container formats that support variable frame rate, but I don't think MJPEG is good choice because of the storage overhead. I believe the best way would be to transcode JPEG frames to MP4 format using both I-frames and P-frames.

您可以使用用于转码的FFMPEG Delphi / FP头文件。

编辑：

最新版本的FFMPEG头文件可以在。要查看文件，您可以使用此链接

The most up to date version of FFMPEG headers can be found at GLScene repository on SourceForge.net. To view the files you can use this link

这篇关于逐帧创建运动JPEG帧率可变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！