[HELP] NTSC DVD .VOB file, 29.97fps - every 5th frame is a dupe

[HELP] NTSC DVD .VOB file, 29.97fps - every 5th frame is a dupe - Printable Version

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NTSC DVD .VOB file, 29.97fps - every 5th frame is a dupe - Miranda - 29.12.2021

I suspect it's a poorly done PAL -> NTSC conversion. What would be the best way to fix this?

RE: NTSC DVD .VOB file, 29.97fps - every 5th frame is a dupe - Selur - 29.12.2021

sRestore is probably the filter you want to try.

RE: NTSC DVD .VOB file, 29.97fps - every 5th frame is a dupe - Miranda - 29.12.2021

Is there a particular setting for removing the dupe frames?

I just did a test via Handbrake, and set the output framerate to 25fps and it worked perfectly.

Handbrake file info:

Quote:cabac=1 / ref=2 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=6 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=30 / rc=crf / mbtree=1 / crf=22.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=20000 / vbv_bufsize=25000 / crf_max=0.0 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:1.00

RE: NTSC DVD .VOB file, 29.97fps - every 5th frame is a dupe - Selur - 29.12.2021

Encoder settings don't influence the frame count, if the encoder itself looses frames it's usually a bug.
No clue what Handbrake has to do with the whole thing, but if it works for you fine with me. Smile

Cu Selur

RE: NTSC DVD .VOB file, 29.97fps - every 5th frame is a dupe - Miranda - 29.12.2021

I still prefer to do the same in Hybrid, I have tried several options with sRestore and so far none have worked.

RE: NTSC DVD .VOB file, 29.97fps - every 5th frame is a dupe - Selur - 29.12.2021

Strange, normally sRestore should work fine for going back to 23.976 from such PAL content.
If it's a fixed pattern you can also drop frames using SelectEvery.

Cu Selur

RE: NTSC DVD .VOB file, 29.97fps - every 5th frame is a dupe - Miranda - 29.12.2021

I need to go back to the original PAL speed of 25fps.

RE: NTSC DVD .VOB file, 29.97fps - every 5th frame is a dupe - Selur - 29.12.2021

Ahhh okay,.. I misunderstood you.
I thought you got PAL content with duplicate frames and you wanted to get back to 23.976 NTSC.

To get 25fps you could:

change the frame rate to 25fps (Filtering->Speed Change->Change speed) and adjust the audio length and pitch.
remove the dublicates (TIVTC or qtgmcBob+sRestore), then change the frame rate to 25 and adjust the audio length and pitch.
remove duplicates using (if the content isn't progressive: qtgmc bob +)sRestore and then using your favorite frame interpolation method (i.e. SVP or RIFE) to get 25fps
assuming the content is telecined: make sure that the scan order is set to telecine, apply TIVTC or VIVTC and then using your favorite frame interpolation method (i.e. SVP or RIFE) to get 25fps

Since you mentioned bulicates every 5th frame I assume you got telecined content which isn't properly flagged, so adjusting the scan order, applying the IVTC and then either interpolating frames or changing the speed of the audio and video is probably what you want to do.

Cu Selur