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D2V_Format_v06.txt
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2004-06-02
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D2V Format v06 for dg-Style D2V Files
-------------------------------------
A. The first line now has a number appended to the string
"DGIndexProjectFile". This is the version number of the
dg-style format. Currently, the version is 06, signifying v06.
If a D2V file with an incorrect version is given to DGDecode(),
the latter will fail to open the D2V file.
B. For transport streams, the PIDs are now stored in the D2V file
in hexadecimal notation.
C. The Field_Operation line now may specify 3 for raw encoded frames.
D. The dg-style D2V file includes an "Aspect_Ratio=" line.
E. The layout for GOP lines is:
7 file position vob cell flags flags ...
Each flags byte is still 0, 1, 2, or 3 as before but it
can be preceded by a 1. If the 1 is present, the encoded
frame can be decoded without reference to the preceding GOP.
This is used to speed up navigation.
F. The position field is now a decimal number that points to the
picture header start code of the first I frame of the GOP if
the stream is nonpacketized, or to the packet header start code
of the packet containing the first I frame of the GOP
if the stream is packetized. This revised indexing supports
correct random navigation.
The vob/cell info obviates the need for a separate D2F file
but may require changes to other applications.
G. The Picture_Size line now omits resizing as it is not supported by
DGDecode(), and is renamed Clipping.
H. The Field_Operation line now omits the SwapOrder option as it is
no longer supported. Use an external filter to swap field order.
I. The picture size is now stored as Picture_Size.
[DAG 5-25-2004]