1080i MBAFF encoding?

[nekrosoft13]

here is the media info

General
ID : 0
Complete name : \\NEKROSERV\Share\L Drive\Need_Convertion\D1\00003.m2ts
Format : BDAV
Format/Info : BluRay Video
File size : 6.57 GiB
Duration : 44mn 59s
Overall bit rate : 20.9 Mbps
Maximum Overall bit rate : 48.0 Mbps

Video
ID : 4113 (0x1011)
Menu ID : 1 (0x1)
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Duration : 44mn 59s
Bit rate : 19.2 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16/9
Frame rate : 29.970 fps
Standard : NTSC
Resolution : 24 bits
Colorimetry : 4:2:0
Scan type : MBAFF
Bits/(Pixel*Frame) : 0.309
Stream size : 6.03 GiB (92%)

Audio #1
ID : 4352 (0x1100)
Menu ID : 1 (0x1)
Format : AC-3
Format/Info : Audio Coding 3
Duration : 44mn 59s
Bit rate mode : Constant
Bit rate : 224 Kbps
Channel(s) : 2 channels
Channel positions : L R
Sampling rate : 48.0 KHz
Stream size : 72.1 MiB (1%)

Audio #2
ID : 4353 (0x1101)
Menu ID : 1 (0x1)
Format : AC-3
Format/Info : Audio Coding 3
Duration : 44mn 59s
Bit rate mode : Constant
Bit rate : 640 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Surround: L R, LFE
Sampling rate : 48.0 KHz
Stream size : 206 MiB (3%)

Text
ID : 4608 (0x1200)
Menu ID : 1 (0x1)
Format : PGS

What would be a good way to re-encode this file, to shrink it a bit.

Would deinterlacing be possible? what type of scan type is MBAFF? Bottom Field? Top Field?

Would it be possible to decimate this file? restore 23.9fps?

[deank]

Useful information about your third question can be found here (http://forum.doom9.org/showthread.php?t=120317).


PAFF means "Picture Adaptive Field Frame", MBAFF means "MacroBlock Adaptive Field Frame".

* PAFF allows to decide, on a frame basis, whether to encode each frame as a frame or as two fields. When encoded as two fields, it's as if you would have done a separatefields() on the frame.
* MBAFF allows to decide, on a macroblock basis, whether to encode as field or frame. Actually, it works on vertical pairs of macroblocks, so on 16x32 areas. You can easily put two frame macroblocks ( on under the other ), or two field ones ( one with the top lines, the other with the bottom lines ).

MBAFF is the most efficient method in almost every cases ( if not all ), as soon as the encoder does a proper job, of course.

Finally, MBAFF and PAFF may be used together. In that case, you can code a frame either as MBAFF ( thus having the choice field/frame per macroblock ) or as field.

De-interlacing + pulldown removal (if required) + reencoding will reduce its size (depending on your x264 settings), as progressive video compresses better than interlaced. But a better way is to aim for DVD5 size with deinterlacing and keep the original framerate.

[nekrosoft13]

thanks for the post, but that doesn't really answer the question. How would I deinterlace those files?

Top Field, Bottom Field?

[Guest]

thanks for the post, but that doesn't really answer the question. How would I deinterlace those files? Use a deinterlacer.

Top Field, Bottom Field? Inspect the video to determine the correct field order.

[Ghitulescu]

thanks for the post, but that doesn't really answer the question. How would I deinterlace those files?

Top Field, Bottom Field?

What gain do you expect by deinterlacing? DVDs you know "allow" interlaced video ;)

45 minutes in good h.264 quality fits perfectly a DVD5. I know, quality cannot be defined, it entirely depends on you.

I think nobody told you yet that DVDRs have a transfer limit that should be considered when setting the maximum bitrate (audio+video+subtitles) for a HD material on DVD. There is a thread here concerning this issue. :search:

It looks like being a documentary - thus it may contain native interlaced sequences (camera) + film sequences. I think you should leave it, like deank said, to its original fps, some BD players are really good in deinterlacing it for HDTV screens, sometimes better than many software solutions.

[Atak_Snajpera]

Top Field, Bottom Field?
Top field for 100%. Only old DV cams used bottom field.