Quicktime File Format (2012-08-14).pdf

Media Data Atom TypesVideo MediaReservedUnpredictable; should be set to 0.TagIdentifies the data type; this field must be set to 'mjpg'.Field sizeThe actual size of the image data for this field, in bytes.Padded field sizeContains the size of the image data, including pad bytes. Some video hardware may append pad bytesto the image data; this field, along with the field size field, allows you to compute how many pad byteswere added.Offset to next fieldThe offset, in bytes, from the start of the field data to the start of the next field in the bitstream. This fieldshould be set to 0 in the last field’s marker data.Quantization table offsetThe offset, in bytes, from the start of the field data to the quantization table marker. If this field is set to0, check the image description for a default quantization table.Huffman table offsetThe offset, in bytes, from the start of the field data to the Huffman table marker. If this field is set to 0,check the image description for a default Huffman table.Start of frame offsetThe offset from the start of the field data to the start of image marker. This field should never be set to0.Start of scan offsetThe offset, in bytes, from the start of the field data to the start of the scan marker. This field should neverbe set to 0.Start of data offsetThe offset, in bytes, from the start of the field data to the start of the data stream. Typically, this immediatelyfollows the start of scan data.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.173