Opened 4 years ago
Last modified 4 years ago
#7774 new defect
ProRes Scanned Alpha omitting last run of a slice if it's length 0
|Reported by:||vinlai||Owned by:|
|Blocking:||Reproduced by developer:||no|
|Analyzed by developer:||no|
Alpha encoded using prores_ks produces slices that omits the final run of a slice if it is length 0. This is the correct behaviour for non-alpha channels, however, the termination conditions are different for alpha.
220.127.116.11 AC Coefficients
They are terminated either by a non-zero array element—a level—or by reaching the end of the array.
7.1.2 Scanned Alpha
They terminate when one of the following occurs: two consecutive array elements have different values; the end of the array is reached; or the maximum permissible run length, 2048, is achieved.
In summary, encoded Alpha should not be omitting the final run of a slice even if it is length 0.
Change History (1)
comment:1 by , 4 years ago
|Version:||unspecified → git-master|