I know that with mp4, the moov atom must be placed at the beginning of the file to enable progressive downloading. That can be done by enabling "faststart" when creating the file.
I'm curious if there are any similar requirements when dealing with webm or ogg files, or are they "progressive download ready" by default?
Due to the way they are constructed, WebM (Matroska) and Ogg files do not have any fast-start remuxing requirements to make them suitable for progressive downloading.