FFMPEG Overlay video on top of another video

Question

I looked through all the questions about this in stackoverflow, but none of the answers worked for me.

I have a video recorded on the screen in mp4 and another video recorded from a webcam in mp4. I want to overlay a video in a webcam in the upper left corner of the screen recorded on the video.

I think I finally found the right command line for this, but when I go to the ffmpeg process, it hangs when it reaches "handler_name: SoundHandler".

Here is my command line:

string overlayPosition = "movie=" + '"' + _videoFile.FileName + '"' + "[inner]; [in][inner] overlay [out]";
string overLayCommand = "-i " + '"' + videoList[0].Path + '"' + " -vf " + '"' + overlayPosition + '"' +  + '"' + " C:\\Users\\james\\output.mp4" + '"';

Does anyone know what I'm doing wrong? I managed to trim the audio and video, trim the video, join the sound, join the video and join the sound and video, but cannot get the overlay to work with: (.

Answer 1

I updated FFMPEG and ended up using this:

string overLayCommand = "-i" + '"' + videoList [0] .Path + '"' + "-i" + '"' + _videoFile.FileName + '"' + "-filter_complex" + '"' +" overlay "+ '"' + "-strict -2" + '"' +" C: \ Users \ james \ output.mp4 "+ '"';