Open GOPs in WMV9

[filler56789]

OK, according to the file VC1_Encoder_SDK.chm:

bClosedEntryPoint

BOOL containing the open or closed GOP setting. The default is FALSE.

Closed GOPs are mainly used for chapter points on optical discs; they are not required for Windows Media.

Recommendation: Off for WMV files. On only at chapter points for optical discs or when streaming WMV.

So, my question is, is there such thing as open GOPs without B-frames ? :confused: :confused: :confused:

[Guest]

No, because without B frames, the I frame is always the first in coding and display order.

[filler56789]

Thanks for the fast answer. :)

I had to ask, because the VC-1 encoder(s) can flag an elementary stream as "open-GOPped" (closedentrypoint = 0) even when the stream doesn't have B-frames. :eek: