The closest I’ve gotten was following the instructions from Matthew Pare on this Drupal post titled “Tips and Encoding Settings for Long Duration Screencasts“.

VIDEO

• Encoding: H.264
• Frame Rate: 10 fps
• Key Frame: 500
• Frame Reordering: Yes
• Data Rate Limit: No
• Encoding Mode: Multi-Pass
• Quality: Medium

AUDIO

• Encoding: AAC, 12 khz, Mono

SIZE

Here is the formula that he proposes, I will attach his actual notes below:

1. Start with the (original width) x (original height)
2. Pick a (desired width) (the height will adjust accordingly)
3. Divide the (desired width) / (original width) = (result1)
4. Now multiply the (original heigth) * (result1) = (desired height)

(you want to round the “desired height” to the closest even number)

MATTHEW PARE QUOTE

That explanation may be a bit confusing so let me give an example. I just have created a screen capture and my video has the dimensions of 1012 x 757. That’s way to big. My video is nearly two hours long, if I kept that size, my final video would be 250MB or even much larger than that. So I want to make this smaller, but still be able to read the text. I am going to say I want my final video to be as close to 800 x 600 as possible. As I have found that size still allows most text to be readable. So I am going to divide my desired output width of 800 by my source length of 1012.

800 / 1012 = .790513834

So now I need to determine the height for my final video. So I take the answer of the above equation multiply it by the height of my source video. So in my example I would multiply my source height of 757 by .79513834.

757 * .79513834 = 598.419

So I am just going to round this number off to 598.

My final video size will now be 800 x 598. Perfect!