Hello - Have a number of still pictures (jpg) that I would like to make into a slideshow. Using information at < https://trac.ffmpeg.org/wiki/Slideshow >, created a file "input.txt" with the format: first_image.jpg duration 5 second_image.jpg duration 5 .... last_image.jpg duration 5 last_image.jpg then ran the command: ffmpeg -f concat -i input.txt -vsync vfr -pix_fmt yuv420p test.mp4 This did work. "test.mp4" is a video with all the images, each displaying for about 5 seconds. But ffmpeg gave the following complaint for each image: [swscaler @ 0x9d13040] deprecated pixel format used, make sure you did set range correctly Tried the command without "-pix_fmt" ; gave same result Tried the command without either "-vsync" or "-pix_ftm"; also gave same result, but processing was much slower Then I converted all the jpg images to png and ran the command again. Same result. Questions: what is a "deprecated pixel format"? What does it mean to "set range" ? What negative effects, if any, might be expected from these warnings? thanks for any information -