Initializes a gst.ByteReader.ByteReader sub-reader instance to contain size bytes of
data from the current position of reader. This is useful to read chunked
formats and make sure that one doesn't read beyond the size of the sub-chunk.
Unlike ByteReader.peekSubReader, this function also modifies the
position of reader and moves it forward by size bytes.
Initializes a gst.ByteReader.ByteReader sub-reader instance to contain size bytes of data from the current position of reader. This is useful to read chunked formats and make sure that one doesn't read beyond the size of the sub-chunk.
Unlike ByteReader.peekSubReader, this function also modifies the position of reader and moves it forward by size bytes.