Lossless Trim an Interlaced AVC in MKV

[Alwyn]

I'd like to trim the video posted in this thread. It's an AVC in MKV and is interlaced (3:3 Pulldown I think is the term). I want to preserve the interlacing, but my normal trimming app, AVIDemux, deinterlaces/IVTCs it. I also tried the stock VDub2 using Direct Stream Copy but that popped a message saying it can't do it. VideoRedo won't preserve the interlacing either.

I would be grateful if anybody can suggest a method where I can trim that video to retain only from the 3sec mark to 9sec while preserving the interlacing/TC.

[krykmoon]

LosslessCut.

[Alwyn]

Legend, thanks Krymoon.

[Alwyn]

MediaInfo's reporting LC changed the frame rate from Constant 29.97 to Variable 137, with "original" FR 29.97.

VDub's showing it as 29.97 still.

I'll look at this further. The interlacing is intact though.

[Alwyn]

Here's the trimmed version from Losslesscut. Can anybody tell me what the framerate is?

[Sharc]

Here's the trimmed version from Losslesscut. Can anybody tell me what the framerate is?

29.97 fps
When you IVTC with TFM().TDecimate(cycle=6,cycleR=1) you get 24.975fps progressive. The original was 25fps slowed down to 25000/1001 before telecining it 2:2:3:2:3 to NTSC compliant 29.97 fps.

Don't know what made MediaInfo to show it as 137.996fps.

[Alwyn]

Thanks Sharc, I found a few posts on 24.975fps. Is that desirable? I was thinking of adding:

AssumeFPS(25, true)

I assume it depends on if a player would not play 24.975, improbable in today's world?

[Sharc]

I can't tell. TV players are sometimes picky, so AssumeFPS(25,true) makes sense. Maybe add SSRC(44100) or SSRC(48000) to resample/restore the audio to a standard sampling rate, so

AssumeFPS(25,true)
SSRC(48000)

I would just check that A/V really stay in sync.