Quote Originally Posted by Greg_E View Post
When you are transcoding, what are you setting to make it 24p. Not sure why I'm asking as I'm selling my GH1, but just worth the info.

Somehow the interlaced recordings have a lower overall bit rate, even though they are twice the frame rate (24p vs. 48i), I still don't quite grasp this. Same goes for the ATSC 1080 30psf standard (60i vs. real 30p), it's really just the odd lines of a 30p frame in one field, and the even lines from that same frame in the second field. Bit rate should be the same but somehow this segmented frame allowed for broadcast where a real progressive frame did not.
I'm not entirely certain how to explain the latter but far as transcoding I'm just using Aiseesoft MTS converter and choosing 24fps as the target (it identifies the original MTS file as 24fps) into a DNxHD format.

I ran this GH13 SreamParser on the original file of the video here (since MediaInfo still identify it as 24fps, but also notes its interlaced)





With the information box containing :

Code:
File: B:\Videos\2017-07-13 Pens\PRIVATE\AVCHD\BDMV\STREAM\00000.MTS
    Size = 2,511,372,288 Bytes (13,080,064 Packets)
Stream: Max Speed = 220,595,700 bps
    Mode =  (actual frame rate is half)
    PCR Timing Interval = 0.095 seconds
    Clip Time = -7:-444:24780.00
    Average Total Bitrate = -742,460
    Average Video Bitrate = 548,693
    Average Audio Bitrate = -4,900
    Average Other Bitrate = -16,491
    Max GOP Size = 2,906,496 Bytes (23,251,968 bits)
    Video Frame Size (Min/Ave/Max)= 26,112 / 184,088 / 395,136
Frame: Video P Frame
Bitrate viewer for that video :



And MediaInfo states

Code:
General
ID                                       : 0 (0x0)
Complete name                            : B:\Videos\2017-07-13 Pens\PRIVATE\AVCHD\BDMV\STREAM\00000.MTS
Format                                   : BDAV
Format/Info                              : Blu-ray Video
File size                                : 2.34 GiB
Duration                                 : 9 min 24 s
Overall bit rate mode                    : Variable
Overall bit rate                         : 35.6 Mb/s
Maximum Overall bit rate                 : 120 Mb/s

Video
ID                                       : 4113 (0x1011)
Menu ID                                  : 1 (0x1)
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4
Format settings, CABAC                   : No
Format settings, RefFrames               : 2 frames
Codec ID                                 : 27
Duration                                 : 9 min 23 s
Bit rate mode                            : Variable
Bit rate                                 : 34.0 Mb/s
Maximum bit rate                         : 16.6 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 24.000 FPS
Standard                                 : NTSC
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Interlaced
Scan type, store method                  : Separated fields
Scan order                               : Top Field First
Bits/(Pixel*Frame)                       : 0.683
Stream size                              : 2.23 GiB (95%)
Color range                              : Limited

Audio
ID                                       : 4352 (0x1100)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Format settings, Endianness              : Big
Codec ID                                 : 129
Duration                                 : 9 min 24 s
Bit rate mode                            : Constant
Bit rate                                 : 192 kb/s
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
Compression mode                         : Lossy
Stream size                              : 12.9 MiB (1%)
Service kind                             : Complete Main
So I'm not entirely sure how 48i is being woven or if it's basically 24psf (which splits exactly half of two frames into one frame at any given time and can be easily deinterlaced).

The way it was described by humpman when I asked the same on personal-view was

@kbeezie i don't clearly underastand your problem, but:
Stock GH1 NTSC mode is 24p and it's packed in 60i interlace with 3:2 pulldown video file.
With "2997i to 2400i" 24p will pack in to 48i interlace without 3:2 pulldown file.
Can't see problem here.