I'm amazed I can't find anything that displays the current frame which is helpful to study test timing and adjusting and knowing where it went wrong. Ideally I would like to show seconds and minutes and the frame number.
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$\begingroup$ Place a text object in front of camera: blender.stackexchange.com/questions/7904/… $\endgroup$ – Jaroslav Jerryno Novotny Nov 20 '17 at 14:17
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Enable the Metadata stamping in the render output properties. It also works for OpenGL renders.
Here is a 720p output example of what it looks like with a bigger font and the default options enabled:
Here's how to find the option in Cycles Render (first image) and in Blender Render/"Internal" (second image):