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11th October 2018, 17:19 | #1 | Link |
Broadcast Encoder
Join Date: Nov 2013
Location: Royal Borough of Kensington & Chelsea, UK
Posts: 2,883
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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 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) 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) 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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