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Old 11th October 2018, 17:19   #1  |  Link
FranceBB
Broadcast Encoder
 
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Join Date: Nov 2013
Location: Royal Borough of Kensington & Chelsea, UK
Posts: 2,883
Field Blended MasterFile (Midnight Texas)

Hi,
I just got a field blended MasterFile from a production studio and I have to encode it in XDCAM50 PAL to air it via our playout (Omneon Ports).
When they said that they were going to deliver an Apple Prores, I expected a nice 23.976fps progressive 10bit to speed it up to 25fps and apply a pitch adjustment.
Unfortunately, that didn't happen...
They did send a ProRes, but...

Code:
General
Complete name                            : C:\Encoding\MidnightTexas.mov
Format profile                           : QuickTime
Codec ID                                 : qt   2005.03 (qt  )
Overall bit rate mode                    : Variable
Overall bit rate                         : 199 Mb/s
Writing library                          : Apple QuickTime

Video
ID                                       : 1
Format                                   : ProRes
Format version                           : Version 0
Format profile                           : 422 HQ
Codec ID                                 : apch
Bit rate mode                            : Variable
Bit rate                                 : 197 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 29.970 (29970/1000) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:2
Scan type                                : Interlaced
Scan type, store method                  : Interleaved fields
Scan order                               : Top Field First
Bits/(Pixel*Frame)                       : 3.178
Writing library                          : any0
Language                                 : English
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
matrix_coefficients_Original             : BT.709

Audio
ID                                       : 2
Format                                   : PCM
Format settings, Endianness              : Little
Format settings, Sign                    : Signed
Codec ID                                 : sowt
Bit rate mode                            : Constant
Bit rate                                 : 1 536 kb/s
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 kHz
Bit depth                                : 16 bits
Language                                 : English

Other
ID                                       : 3
Type                                     : Time code
Format                                   : QuickTime TC
Time code of first frame                 : 11:23:35;00
Time code, striped                       : Yes
Language                                 : English
Default                                  : No
When I saw "29.970fps interlaced TFF" I thought "fair enough, it's 23.976fps telecined".
Nope...

It's field-blended with progressive parts on a regular pattern.
They basically recorded at 23.976fps progressive, edited it while progressive and they exported it field-blending it in order to air it in NTSC.

Code:
#Index original 10bit source
FFMpegSource2("MidnightTexas.mov", atrack=-1)

#Dithering down to 8bit with Floyd-Steinberg error diffusion
ConvertBits(bits=8, dither=1)

#Converting from 4:2:2 planar to 4:2:2 interleave
ConverttoYUY2(interlaced=true)

#Deinterlacing the field-blended parts
tdeint(mode=2, order=-1, field=-1, mthreshL=6, mthreshC=6, map=0, type=2, debug=false, mtnmode=1, sharp=true, cthresh=6, blockx=16, blocky=16, chroma=true, MI=64, tryWeave=true, link=1, denoise=true, slow=2, opt=4)

#Trying to restore the original progressive frames
SRestore(frate=23.976)

#Speed-up +4% with pitch adjustment
AssumeFPS(25, 1, true)
ResampleAudio(48000)

#Converting from 4:2:2 interleave to 4:2:2 planar
Converttoyv16(interlaced=false)
Unfortunately, the resulting 25fps PAL file still had some of the field-blended frames, 'cause SRestore didn't remove the right blended frames.
I tried with TDecimate(mode=2, rate=23.976) but it didn't work either 'cause TDecimate it's supposed to remove duplicated frames, not the blended ones.

I then said "whatever, I'm gonna blend it to 50 and make a interlaced" like:

Code:
#Index original 10bit source
FFMpegSource2("MidnightTexas.mov", atrack=-1)

#Dithering down to 8bit with Floyd-Steinberg error diffusion
ConvertBits(bits=8, dither=1)

#Converting from 4:2:2 planar to 4:2:2 interleave
ConverttoYUY2(interlaced=true)

#Deinterlacing the field-blended parts
tdeint(mode=2, order=-1, field=-1, mthreshL=6, mthreshC=6, map=0, type=2, debug=false, mtnmode=1, sharp=true, cthresh=6, blockx=16, blocky=16, chroma=true, MI=64, tryWeave=true, link=1, denoise=true, slow=2, opt=4)

#Blending the resulting 29.970 to 50fps
ConvertFPS(50)

#Diving in field to get 25i
assumeTFF()
separatefields()
selectevery(4,0,3)
weave()

#Converting from 4:2:2 interleave to 4:2:2 planar
Converttoyv16(interlaced=true)
The result was awful and I didn't have the guts to send it to QC.

In other words, I have to get back the original 23.976fps progressive to apply the speed-up.
Luckily enough, the field-blended frames follow a regular pattern through the whole video.

The pattern is:
0 = Progressive
1 = Progressive
2 = Field Blended
3 = Progressive
4 = Progressive
5 = Progressive
6 = Progressive
7 = Field Blended
8 = Progressive
9 = Progressive
10 = Progressive
11 = Progressive
12 = Field Blended
13 = Progressive
14 = Progressive
15 = Progressive
16 = Progressive
17 = Field Blended
18 = Progressive
19 = Progressive
20 = Progressive
21 = Progressive
22 = Field Blended
23 = Progressive
24 = Progressive
25 = Progressive
26 = Progressive
27 = Field Blended
28 = Progressive
29 = Progressive
30 = Progressive
31 = Progressive
32 = Field Blended
33 = Progressive
34 = Progressive
35 = Progressive
36 = Progressive
37 = Field Blended


I think I could achieve this via SelectEvery but I don't know how to set the pattern.

Last but not least, I'm afraid I can't upload a sample as it's protected copyright material that we have the rights to air on our channels, but I can't redistribute it here.

Thank you in advance,
Frank.

Last edited by FranceBB; 11th October 2018 at 17:27.
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