I cut videos using the command below, and I sometimes find that the resulting video has imperfections at the beginning (square artifacts in the image). If I advance the start time parameter value (
START_AT_SECONDS) by a few seconds (usually 1..3s), the artifacts go away.
Is there a way to avoid the hit-and-miss, e.g. to know in advance that
START_AT_SECONDS=53 works but
START_AT_SECONDS=52 will give artifacts? Is there an option that means "START_AT_SECONDS=52, or later as needed to make a good cut"?
ffmpeg -ss START_AT_SECONDS -i "some_file_name.mp4" -t DURATION_SECONDS -c copy "new_name.mp4"