多个视频源合二为一 [英] Multiple video sources combined into one

问题描述

我正在寻找一种有效的方法来执行以下操作:

I am looking for an efficient way to do the following:

使用多个源视频(长度大致相同)，我需要生成一个输出视频，该视频由所有在其自己区域中运行的原始源组成(例如一堆 PIP 有几种不同的尺寸).所以，最终的结果是所有的原件都是并排运行的，每个都在自己的区域/盒子里.

Using several source videos (of approximately the same length), I need to generate an output video that is composed of all of the original sources each running in its own area (like a bunch of PIPs in several different sizes). So, the end result is that all the original are running side-by-side, each in its own area/box.

源和输出必须是 flv 并且我使用的平台是 Windows(在 Windows 7 64 位上开发，部署到 Windows Server 2008).

The source and output need to be flv and the platform I am using is Windows (dev on Windows 7 64bit, deployment to Windows server 2008).

我查看了 avisynth 但不幸的是它无法处理 flv 和非插件和我试过的 flv 分离器.

I have looked at avisynth but unfortunately it can't handle flv and non of the plugins and flv splitters I have tried worked.

我目前的流程使用 ffmpeg 的方式如下:

My current process uses ffmpeg in the following manner:

1. 使用 ffmpeg 为每个视频每秒生成 25 个 png，并根据需要调整原始大小.
2. 使用 System.Drawing 命名空间将每组帧组合成一个新图像，从静态背景开始，然后将每个帧加载到 Image 并绘制到背景 Graphics 对象 - 这给了我组合的框架.
3. 使用 ffmpeg 将生成的图像组合成视频.

1. Use ffmpeg to generate 25 png's per second per video, resizing the original as needed.
2. Use the System.Drawing namespace to combine each set of frames into a new image, starting with a static background, then loading each frame into an Image and drawing to the background Graphics object - this gives me the combined frames.
3. Use ffmpeg to combine the generated images to a video.

所有这些都是非常 IO 密集型的(这是我目前的处理瓶颈)，我觉得必须有一种更有效的方法来实现我的目标.我在视频处理方面没有太多经验，也不知道有哪些选择.

All this is very IO intensive (which is my processing bottleneck at the moment) and I feel there must be a more efficient way to reach my goal. I do not have much experience with video processing, and don't know what options are out there.

谁能提出更有效的处理方法?

Can anyone suggest a more efficient way of processing these?

推荐答案

在 ffmpeg 中做所有事情.您可以使用 视频过滤器 做很多事情.例如并排加入两个视频:

Do everything inside ffmpeg. You can do a lot of things with video filters. For example to join two videos side by side:

ffmpeg -i input0.avi -vf "movie=input1.avi [in1]; [in]pad=640*2:352[in0]; [in0][in1] overlay=640:0 [out]" out.avi

@Oded:这基本上就是这个命令的作用.您可以移除 pad 过滤器并更改 overlay 过滤器的参数以将第二个视频移动到您喜欢的任何位置.

@Oded: That's basically what this command does. You can remove the pad filter and change the parameters of overlay filter to move the second video wherever you like.

ffmpeg -i big.avi -vf "movie=small.avi [small]; [in][small] overlay=10:10 [out]" out.avi

我提供的链接描述了过滤器语法.您可以将多个过滤器链接在一起:

The link I provided describes the filter syntax. You can chain multiple filters together:

ffmpeg -i big.avi -vf "movie=small0.avi [small0]; [in][small0] overlay=10:10 [tmp];
                       movie=small1.avi [small1]; [tmp][small1] overlay=30:10 [out]" out.avi

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