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Old 15th June 2008, 09:35   #1  |  Link
Kurtnoise
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[x264] tff vs bff

quoting the strings help :

Quote:
--interlaced Enable pure-interlaced mode (tff)
--tff Alias for --interlaced
--bff Enable pure-interlaced mode (bff)
It's very confusing when we read this imo. So, can we have some tweakings for this please ?



coz my main goal is to know what is (are) the difference(s) between bff and tff ?

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Old 15th June 2008, 10:26   #2  |  Link
Sagittaire
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Well I understand that:

Quote:
--interlaced Enable pure-interlaced mode (tff)
enable interlacing with top field first by default

Quote:
--tff Alias for --interlaced
exactly the same command than --interlaced

Quote:
--bff Enable pure-interlaced mode (bff)
enable interlacing with bottom field first by default

In fact --interlaced command here is useless. you must just know if your interlaced source is bff or tff.
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Old 15th June 2008, 10:44   #3  |  Link
Kurtnoise
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ok...So, "bottom Field 1st" & "top Field 1st" should be added in the comments strings help then.
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Old 15th June 2008, 15:12   #4  |  Link
Dark Shikari
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Talk to the person who maintains that patch; it isn't in git x264.
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Old 15th June 2008, 16:46   #5  |  Link
Gabriel_Bouvigne
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Depending on the underlying implementation, TFF vs BFF might just be a matter of signalisation. TFF just means that within a frame made of 2 fields, the top field should be displayed first, and BFF that the bottom field should be displayed first.
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Old 16th June 2008, 06:17   #6  |  Link
nm
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Quote:
Originally Posted by Gabriel_Bouvigne View Post
Depending on the underlying implementation, TFF vs BFF might just be a matter of signalisation.
Yes, dattrax's patch that adds those parameters is only about signaling interlacing properties within the SEI info. Parameter --interlaced is the MBAFF switch in vanilla x264 and the patch adds --tff and --bff.
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