GOP Trim:

Check this box to trim a video clip on GOP (I-frame) boundaries. With 
this option checked (ON), the saved file will be on an I-frame boundary 
and the packet structures of the original file will be preserved except 
at the beginning and the end of the saved file. Therefore, a "GOP Trim" 
is almost like a binary cut to an MPEG file. Please note that the saved 
file by a "GOP Trim" will always include both the Mark In and the Mark 
Out frames. Also, please note that this option will affect all trim jobs 
in the trim batch list.


GOP size compliance for DVD recording:

Check this box to require that all exported MPEG movies will have the 
GOP size compliance for DVD recording. This will introduce partial video 
re-encoding to those GOP's that exceed the maximum GOP size set by the 
DVD standard.


Use CRC error protection:

Check this box to require that all exported MPEG-1 audio frames will 
have the CRC error protection code. This is a requirement by the DVD 
standard format for the inclusion of MPEG-1 audio, but it is often 
ignored by most DVD systems.

Re-encode the whole audio if any part needs re-encoding: 

Check this box to re-encode the whole audio track if any part needs to 
be re-encoded, such as a fade and a transition. This is useful to avoid 
any sound discontinuity that may be introduced at the connecting point 
between copied part and re-encoded part.

The default selection is to re-encode only those segments for which the 
sound has been modified. However, for some sound track this may 
introduce an audible sound artifact at the point across the re-encoded 
fade section and its immediate following copied sound segment, 
especially for a continuous single pitch sound.

Select this option will ensure the continuity of the whole sound track, 
but at the expense of added computation for re-encoding the complete 
sound track.

  Automatically save multiple audio streams for the video track:

With this option checked (the default), the editor will save all 
unselected audio streams included in the video clips on the video track 
of the timeline. For those unselected audio streams, the editor will not 
apply all the editing operations that have been applied to the video 
clips, it will only copy the existing audio.


Preserve Field Order:

This is the default setting for exporting NTSC MPEG-2 video with 
repeated fields as frequently found in movies that are originated from 
films which have a 24 frame rate. If this is unselected, the editor may 
destroy the original field order in the exported video for such movies. 
Thus, it's highly recommended that this option be always selected.



No re-encoding for bit rate change over VBR files:

This option is used to direct the export to output the video as a stream 
copy without re-encoding when the video encoder (peak) bit rate is set 
to be lower than that of the input files, and when there is no other 
video encoder change.

This is useful mainly for an MPEG file whose video bit rate was set much 
higher than its actual data rate.









Brad Cox wrote:
> Hi Rick,
>
> What is the meaning of, and the alternative selections for (I assume
> just NO or OFF) these:
>
> OFF GOP TRIM   
> (Presumably this means that the last GOP is not left open, if so I would
> recommend that it be ON/YES.)
>
> YES GOP SIZE COMPLIANCE FOR DVD RECORDING 
> (If this is set to OFF/NO, what does that mean?  Isn't there a setting
> to specify a particular GOP size?)
>
> off preserve field order
> (If you turn this ON, and you can set the field order to Top Field
> First, then you should do that. In the event that you play back a mix of
> Womble'd files and those recorded on ImageServer, you will get
> progressive audio slip at each transition.)
>
> off no re-encoding for bit rate change over VBR files
> (What'sit mean?)
>
>
> Best Regards,
> Brad Cox
> Principal Systems Analyst
> 360 Systems Broadcast
>  
> 31355 Agoura Road
> Westlake Village, CA 91361
>  
> (818) 991-0360   fax (818) 991-1360
>  
> www.360systems.com
>