Questions about AVC/H.264 decoder settings

[(*|*)]

I need help about these settings:

Quality:
Obey quality messages
Skip none
Skip B
Skip PB

Error concealment
Off
Don't show frames with errors

Chroma upsampling:
On
Off

Double rate:
On
Off

Field reordering:
Off
Invert flags
Invert fields

Condition of Field reordering:
Always
Top field is first
Bottom field is first

SMP:
Auto
By picture
By slice
Off

# of threads

Synchronization:
PTS
PTS (reference only)
Off
Direct timestamps

Rate interpretation:
Field rate
Frame rate
Fixed rate

Fixed frame rate:
25.00

Format type:
Both
VideoInfo1
VideoInfo2

Low-latency:
Off
On

Stream order:
Off
On

Output queue:
2
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