Itseez/opencv — pull request #1784 by SpecLad (2013-11-11 14:42:40+00:00)
Title: Replace the image used in the Highgui_Video.ffmpeg_image test

Our prebuilt FFmpeg Windows binaries don't have PNG support enabled (because that requires zlib), so that makes a PNG image a bad choice for this test.

When FFmpeg doesn't support PNG, `VideoCapture` falls back to the "image sequence" implementation, which doesn't work for single images.