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POCombine multiple videos into one
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  1. POCombine multiple videos into one
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    copied!<p>I have three videos:</p> <ul> <li>a lecture that was filmed with a video camera</li> <li>a video of the desktop capture of the computer used in the lecture</li> <li>and the video of the whiteboard</li> </ul> <p>I want to create a final video with those three components taking up a certain region of the screen.</p> <p>Is open-source software that would allow me to do this (mencoder, ffmpeg, virtualdub..)? Which do you recommend?</p> <p>Or is there a C/C++ API that would enable me to create something like that programmatically?</p> <p><b>Edit</b><br>There will be multiple recorded lectures in the future. This means that I need a generic/automated solution. </p> <p>I'm currently checking out if I could write an application with GStreamer to do this job. Any comments on that?</p> <p><b>Solved!</b><br> I succeeded in doing this with GStreamer's videomixer element. I use the gst-launch syntax to create a pipeline and then load it with gst_parse_launch. It's a really productive way to implement complex pipelines.</p> <p>Here's a pipeline that takes two incoming video streams and a logo image, blends them into one stream and the duplicates it so that it simultaneously displayed and saved to disk.</p> <pre><code> desktop. ! queue ! ffmpegcolorspace ! videoscale ! video/x-raw-yuv,width=640,height=480 ! videobox right=-320 ! ffmpegcolorspace ! vmix.sink_0 webcam. ! queue ! ffmpegcolorspace ! videoscale ! video/x-raw-yuv,width=320,height=240 ! vmix.sink_1 logo. ! queue ! jpegdec ! ffmpegcolorspace ! videoscale ! video/x-raw-yuv,width=320,height=240 ! vmix.sink_2 vmix. ! t. t. ! queue ! ffmpegcolorspace ! ffenc_mpeg2video ! filesink location="recording.mpg" t. ! queue ! ffmpegcolorspace ! dshowvideosink videotestsrc name="desktop" videotestsrc name="webcam" multifilesrc name="logo" location="logo.jpg" videomixer name=vmix sink_0::xpos=0 sink_0::ypos=0 sink_0::zorder=0 sink_1::xpos=640 sink_1::ypos=0 sink_1::zorder=1 sink_2::xpos=640 sink_2::ypos=240 sink_2::zorder=2 tee name="t" </code></pre>
 

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