我可以使用Gstreamer API合并2个视频吗? [英] Can I use the Gstreamer API to merge 2 videos?

问题描述

我想编写一个简单的linux CLI应用程序，它可以接收2个视频源(1个主持人正在讲话，1个有幻灯片但没有音频)并合并它们.

I'd like to write a simple linux CLI application that can take 2 video sources (1 of a presenter talking and 1 with their slides and no audio) and merge them.

我希望整个输出视频并排成为两个原始视频.如果不这样做，我的第二个最佳选择就是画中画"风格的视频，演示者位于角落的小框中.

I'd like the entire output video to be the two original videos, side by side. Failing that, my second best option would be a "picture in picture" style video, with the presenter in a small frame in the corner.

从几个小时的研究来看，GStreamer看起来可能能够做到这一点.在我花更多时间尝试之前，有人可以确认吗?

From a few hours research, GStreamer looks like it might be able to do this. Can anyone confirm it before I spend more time trying it out?

如果不能，那我可以使用其他API吗?

If it can't, are there other APIs out there that I might be able to use?

推荐答案

事实证明，gstreamer可以合并两个视频，并使用videomixer过滤器将它们并排放置到输出视频中.

It turns out gstreamer can merge two videos, placing them side by side into an output video using the videomixer filter.

一个基本的管道需要两个输入文件，将它们缩放为相同大小，然后将它们合并并编码为theora视频，如下所示:

A basic pipeline that takes two input files, scales them to be the same size, then merges them and encodes them into a theora video might look like this:

filesrc -> decodebin -> ffmpegcolourspace -> videoscale ->  videobox -> videorate
                                                                                  \
filesrc -> decodebin ->  ffmpegcolourspace  ->  videoscale  ->  videorate   ->    videomixer -> ffmpegcolourspace -> theoraenc -> oggmux -> filesink

如何实现此管道取决于语言.我使用Ruby绑定进行原型设计，并且效果很好.

How you implement this pipeline depends on the language. I prototyped with the Ruby bindings, and it works really well.

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