MFSampleExtension_RepeatFirstField attribute

Specifies whether to repeat the first field in an interlaced frame. This attribute applies to media samples.

Data type

BOOL stored as UINT32

Syntax

GUID MFSampleExtension_RepeatFirstField = {0x304d257c,0x7493,0x4fbd,{0xb1,0x49,0x92,0x28,0xde,0x8d,0x9a,0x99} }

Get/set

To get this attribute, call IMFAttributes::GetUINT32

To set this attribute, call IMFAttributes::SetUINT32

Applies to

IMFSample:

Remarks

If the value is FALSE or the attribute is not set, the first field is not repeated. If the value is TRUE, the first field is repeated. The value TRUE is valid only when the following conditions are true:

The media type is mixed interlaced and progressive. (The MF_MT_INTERLACE_MODE attribute on the media type is MFVideoInterlace_MixedInterlaceOrProgressive.)
The frame is progressive and the MFSampleExtension_Interlaced attribute on the sample is TRUE.
The MFSampleExtension_BottomFieldFirst attribute is set on the sample. The value can be TRUE or FALSE. The ordering of the fields is determined by this attribute.

This attribute is used for 3:2 pulldown. The following table shows the order in which fields are displayed.

MFSampleExtension_RepeatFirstField	MFSampleExtension_BottomFieldFirst	Field order
TRUE	TRUE	Lower, upper, lower
TRUE	FALSE	Upper, lower, upper
FALSE	TRUE	Lower, upper
FALSE	FALSE	Upper, lower

The GUID constant for this attribute is exported from mfuuid.lib.

Requirements

Header: Declared in mfapi.h.