The write_colr flag has been marked as experimental for over 5 years. It should be safe to enable its behavior by default as follows: - Write the colr atom by default for mp4/mov if any of the following: - The primaries/trc/matrix are all specified, OR - There is an ICC profile, OR - The user specified +write_colr - Keep the write_colr flag for situations where the user wants to write the colr atom even if the color info is unspecified (e.g., http://ffmpeg.org/pipermail/ffmpeg-devel/2020-March/259334.html) This fixes https://trac.ffmpeg.org/ticket/7961 Signed-off-by: Michael Bradshaw <mjbshaw@google.com>