@ElCid:
Ok, yes a bit odd, but not as much as it may first appear. Here's the real deal with this encode:
The BD Source was 29.970 MBAFF. This MBAFF format can be very tricky to encode and deinterlace. The encode was done in 2 segments: 1-OP & 2-Main Chapters+ED. The video is actually properly deinterlaced/interleaved to the normal 23.976 fps like any anime. But, there were unexpected issues with the OP deinterlacing, so the OP was done at double frame rate (59.940) to get it to playback smoothly.
This is why when the two separately encoded segments are joined, Media Info will report a strange aggregate frame rate (fps) for the entire video.
I did not like doing it this way, and I knew there would be some people wondering just what the heck had been done. But, this can happen with OP and ED segments sometimes, usually though with the ED scrolling text credits. In this case the issues were in the OP.
Here is the source BD clip info: (FYI)
Frame rate : 29.970 (30000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : MBAFF
Scan type, store method : Interleaved fields
Scan order : Top Field First
Yeah, I know. I guess media info reports the initial fps it sees in the vid, which in this case is 59.xxx for the OP. But, I notice it also reports the combined rate and labels it as 'variable'. Makes for a really screwy looking stat.
It was all for a single 5 second set of frames, where I could not get the interleaved blending to properly reconcile at 23.xxx. When I tried the double rate it magically all was fine. It's a lot of extra work doing that for 24 episodes to eliminate just a few errant ghosted frames. It sucks when OP/ED segments are problematic.
Here is the encode main chapters and ED segment info: (Vapoursynth encode)
General
Unique ID : 291912826401784686798411364613829754876 (0xDB9C5D87B1E9E3033E9CE1F522F4FFFC)
Complete name : O:\MeGUI-TEMP\Kiddy Grade BDMV 1080p\ENCODES [Batch]\SAV [Main Video Encodes]\KiddyGrade EP02 (Ch2-5).mkv
Format : Matroska
Format version : Version 4
File size : 1.38 GiB
Duration : 21 min 50 s
Overall bit rate : 9 034 kb/s
Encoded date : UTC 2020-08-31 00:51:36
Writing application : mkvmerge v47.0.0.57 ('Black Flag') 64-bit
Writing library : libebml v1.4.0 + libmatroska v1.6.0
Attachments : 2020-08-30@16_13_39_3810_BAARS___.TTF
Encoding Gui : Hybrid 2020.08.02.1
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High [email protected]
Format settings : CABAC / 10 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 10 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 21 min 50 s
Bit rate : 9 033 kb/s
Width : 1 440 pixels
Height : 1 080 pixels
Display aspect ratio : 4:3
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 10 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.242
Stream size : 1.38 GiB (100%)
Writing library : x264 core 161 r3018 db0d417
Comments - 10
Moses35i
MiRT
ElCid
SomaHeir
Garo7
ElCid
Garo7
Haiyami
wolfed2002
shadowlink29