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Old 27th November 2017, 03:50   #1  |  Link
jriker1
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bff or tff

Captured a bunch of VHS material lossless few years ago and just getting around to cleaning it up. With interlacing, is my material. BFF or TFF? it was created with:

Windows 7
Virtualdub
Lagarith codec
ATI 600 USB capture
Svhs recorder
Couple other hardware items in between as needed
Captured to AVI

What type of interlaced material will this create? TFF or BFF?

thanks.

JR
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Old 27th November 2017, 04:36   #2  |  Link
jriker1
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Fyi. Did a one minute test in ffmpeg. Results:

frame= 1798 fps=4.5 q=-0.0 Lsize= 1078800kB time=00:00:59.99 bitrate=147308.7kbits/s speed=0.149x
video:1078800kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
[Parsed_idet_0 @ 0000000002836fa0] Repeated Fields: Neither: 1796 Top: 0 Bottom: 2
[Parsed_idet_0 @ 0000000002836fa0] Single frame detection: TFF: 833 BFF: 20 Progressive: 4 Undetermined: 941
[Parsed_idet_0 @ 0000000002836fa0] Multi frame detection: TFF: 1763 BFF: 0 Progressive: 0 Undetermined: 35

Seems TFF but see some bff in there to.

Running a separate test

frame=10000 fps= 33 q=-0.0 Lsize= 6000000kB time=00:05:33.66 bitrate=147308.7kbits/s speed=1.09x
video:6000000kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
[Parsed_idet_0 @ 0000000000db90a0] Repeated Fields: Neither: 9997 Top: 1 Bottom: 3
[Parsed_idet_0 @ 0000000000db90a0] Single frame detection: TFF: 7368 BFF: 45 Progressive: 67 Undetermined: 2521
[Parsed_idet_0 @ 0000000000db90a0] Multi frame detection: TFF: 9648 BFF: 121 Progressive: 197 Undetermined: 35

JR

Last edited by jriker1; 27th November 2017 at 04:47.
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Old 27th November 2017, 13:02   #3  |  Link
StainlessS
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Code:
WhateverSource(...)

AssumeTFF # or AssumeBFF
SeparateFields
BilinearResize(Width,Height*2) # Added
# Play source, if jumps backwards and forwards then needs other AssumexFF
EDIT: Above, Avisynth script.
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"Some infinities are bigger than other infinities", but are any of them infinitely bigger ???

Last edited by StainlessS; 28th November 2017 at 15:11.
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Old 27th November 2017, 15:00   #4  |  Link
jriker1
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thanks StainlessS. Either way it just plays thru half size. Never heard of that suggestion when determining bff or tiff. I thought usually the import method determined this but wasn't sure.

Thanks.

JR
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Old 27th November 2017, 17:26   #5  |  Link
StainlessS
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If You like, add eg BilinearResize(Width,Height*2) to play at normal size. [EDIT: it will wobble up/down a bit]

TFF/BFF governs placement in time of fields, if wrong way around then you would get jumping backwards/forwards because of being
out out of temporal sequence (during continuous movement).

It is the Standard/Often quoted, way to judge if Field Order is correct.
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"Some infinities are bigger than other infinities", but are any of them infinitely bigger ???
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Old 10th December 2017, 00:34   #6  |  Link
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You used the ATI 600 USB card. It's TFF always.
BFF is essentially just DV boxes or DV cameras, rarely any capture cards.
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Old Yesterday, 10:47   #7  |  Link
Ben_Nicholls
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Feel free to post a sample and I will tell ya But my money is on on TFF
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