If you use the paid versions of either Snagit or Screencast-O-Matic, you will be able to record audio, both from a microphone and the System Audio. Any sounds being played from your PC, such as the audio from a YouTube video or Prezi presentation, will be captured into your Snagit/SOM videos. You could create a Prezi presentation, with embedded video, and then play and record the Prezi via SOM/Snagit, while adding audio narration from your headset.
Prezi doesn't work with your Chromebook, but both Stupeflix and Vizia work really well, both for creating & viewing. Stupeflix makes it easy to import still images (from Bing, exported PowerPoint slides, etc.), and videos, and then add audio narration, or type your dialogue via "text to speech" (they provide several good computer generated voices).
Once you have your video, you can add it to YouTube and then use Vizia to add interactive elements to it such as polling, simple quizzes and redirects to other web content via URLs. Want to make sure your students are viewing your presentation "actively"? Ask them questions periodically, regarding the video, via Vizia. At the end of your video provide a link to additional materials via Vizia. *Vizia worked well on my Chromebook & PC, but seemed to bawk on my Samsung Tab 4 device. On the Tab 4, the Vizia event points were ignored and it just played through the video.
The mp4 videos embed well into a Canvas page, or WordPress site, if allowed, and play well on mobile devices.
You can use the free, online image editor via Pixlr Editor to resize, crop, modify, add text to, enhance, re-format, etc. any images you want to include and get a bunch of quality images via Bing to illustrate your topics. Maybe you would like to spiff up your text with some catchy, free TrueType fonts. With Windows 10 it is even easier to add these fonts to your system (right-click on the font file & click Install). Then use these fonts to set the mood in your PowerPoint slides. Put your webcam above your monitor and open EasyPrompter, paste in your dialogue text and start recording your video. You are reading from the screen, but depending upon how well you can place your camera, it looks like you are talking impromptu. I found that Video Teleprompter Lite by Joe Allen worked well on my iPad. The text you are reading is placed near the camera lens so it looks even more like you are looking at the camera and not reading text.
Finally, the two best ways to improve your home made videos (besides a good camera, and I do not know one from the other) is to make sure you have a good microphone, and good lighting. Poor audio or lighting is a distraction and makes even an interesting topic boring. Maybe check out some of the new LED lights. Swivl had a nice audio/remote tracking device that recorded your audio via a good distance, and the automated tracking makes you mesmerizing;-)
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