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  1. Member brassplyer's Avatar
    Join Date: Apr 2008
    Location: United States
    Search Comp PM
    Tweaking DVD video for someone and find the vob files and subsequent mpegs are top field first.

    Is it possible or even necessary to change this to bottom field first?

    Thanks.
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  2. Possible, yes. Necessary, no.
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  3. Member brassplyer's Avatar
    Join Date: Apr 2008
    Location: United States
    Search Comp PM
    Further searching led me to this script

    # TFF (or BFF) interlaced YV12 video
    ConvertToYUY2(interlaced=true)
    Crop(0,1,-0,-0) # remove top scan line
    AddBorders(0,0,0,1) # add one scan line to the bottom
    # TFF converted to BFF (or BFF converted to TFF)
    ConvertToYV12(interlaced=true)
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  4. Yes, you can do that or:
    Code:
    SeparateFields()
    Trim(1,0)
    Weave()
    But DVD supports both TFF and BFF so there's no reason to convert.
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  5. Member DB83's Avatar
    Join Date: Jul 2007
    Location: United Kingdom
    Search Comp PM
    I also read (maybe I imagined it) that TFF produces the better player compatability.

    I will even encode BFF (DV) as TFF mpeg2 for dvd. In fact that is all that procoder will allow (unless I missed something)

    It might help if you also stated why you feel that you need to change this
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  6. Member brassplyer's Avatar
    Join Date: Apr 2008
    Location: United States
    Search Comp PM
    Originally Posted by DB83 View Post
    It might help if you also stated why you feel that you need to change this
    Just that BFF is the "norm" and wondered if there was any potential problem with video being TFF.
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  7. BFF is not the norm. Almost all commercial interlaced DVD's I've seen are TFF.
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  8. Banned
    Join Date: Oct 2004
    Location: New York, US
    Search Comp PM
    -30-
    Last edited by sanlyn; 19th Mar 2014 at 10:24.
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  9. Member brassplyer's Avatar
    Join Date: Apr 2008
    Location: United States
    Search Comp PM
    Well 'ya learn something new everyday. The DVD's I've burned show up as BFF as does any DV video I've captured which is what I was going by. On one commercial DVD I checked that would actually let me see anything about the file info with Mediainfo it shows TFF.

    So, why do they make the DVD's with TFF instead of BFF?
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  10. Why does DV use BFF instead of TFF?
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