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[HELP] Video stuttering after processing - Printable Version

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Video stuttering after processing - matti157 - 13.10.2024

I am trying to get a video to upload to youtube from a PAL VHS tape.

I am following this flow, following this video https://www.youtube.com/watch?v=pKYNqZdqawc
1) Acquisition with Virtualdub and Dazzle DVC100.
2) Deinterlacing and conversion to Apple Prores via Hybrid
3) Color enhancement with DaVinci Resolve and compression to h264

Step 1 all ok, I got a video file of about 30GB and it is to be deinterlaced with top field first. The video looks good, has no stuttering and has these characteristics:

Format                                   : AVI
Format/Info                              : Audio Video Interleave
Format profile                           : OpenDML
Format settings                          : WaveFormatEx
File size                                : 35.1 GiB
Duration                                 : 1 h 23 min
Overall bit rate                         : 60.5 Mb/s
Frame rate                               : 25.000 FPS

Video
ID                                       : 0
Format                                   : YUV
Codec ID                                 : ULY2
Codec ID/Info                            : Ut Video Lossless Codec
Codec ID/Hint                            : Ut Video
Duration                                 : 1 h 23 min
Bit rate                                 : 58.9 Mb/s
Width                                    : 720 pixels
Height                                   : 576 pixels
Display aspect ratio                     : 5:4
Frame rate                               : 25.000 FPS
Standard                                 : PAL
Color space                              : YUV
Chroma subsampling                       : 4:2:2
Compression mode                         : Lossless
Bits/(Pixel*Frame)                       : 5.683
Stream size                              : 34.2 GiB (97%)

Audio
ID                                       : 1
Format                                   : PCM
Format settings                          : Little / Signed
Codec ID                                 : 1
Duration                                 : 1 h 23 min
Bit rate mode                            : Constant
Bit rate                                 : 1 536 kb/s
Channel(s)                               : 2 channels
Sampling rate                            : 48.0 kHz
Bit depth                                : 16 bits
Stream size                              : 913 MiB (3%)
Alignment                                : Aligned on interleaves
Interleave, duration                     : 10  ms (0.25 video frame)
Interleave, preload duration             : 229  ms

Step 2, I set really few options in hybrid, but if I open the resultant prores video with VLC there is so much stuttering! The video is full of jerks that make it annoying to watch
This are all the options that I change from default

[Image: 1.png]

[Image: 2.png]

[Image: 3.png]

[Image: 4.png]

[Image: 5.png]

Any help? Thanks
  • What Hybrid version did you use?(Windows/Mac/Linux 32/64bit + versions number)
    Windows 2024.09.29.1

If you need the debug infos I relaunch the process, it's about 5h  Big Grin

RE: Video stuttering after processing - Selur - 13.10.2024

If your video is stuttering if you use 'top field first' it probably isn't 'top field first' but 'button field first'.
You can use the Vapousynth Preview to check whether the scan order is wrong.

RE: Video stuttering after processing - matti157 - 13.10.2024

(13.10.2024, 20:00)Selur Wrote: If your video is stuttering if you use 'top field first' it probably isn't 'top field first' but 'button field first'.
You can use the Vapousynth Preview to check whether the scan order is wrong.

Tried now with Vapousynth Preview, top is correct. With bottom I have one frame forward and one frame backward

RE: Video stuttering after processing - Selur - 13.10.2024

Okay, try whether using a different source filter helps.
Try disabling 'Prefer Bestsource'.

RE: Video stuttering after processing - matti157 - 13.10.2024

(13.10.2024, 21:28)Selur Wrote: Okay, try whether using a different source filter helps.
Try disabling 'Prefer Bestsource'.

thanks for your disponibility

Before you answered me, I tried to make the conversion to prores as fast as I could. 1h processing time.
Prores proxy
No crop
No upscale
Only deinterlacing

No more stuttering

Tomorrow then I start the conversion with crop and upscale,which takes 5h, disabling “Prefer Bestsource” as you recommend.

I'm having a doubt, maybe I set incorrect size earlier in the crop stage that can cause stuttering?


options for 1h conversion:
[Image: 1.png]

[Image: 2.png]

[Image: 3.png]

RE: Video stuttering after processing - Selur - 14.10.2024

Crop settings should Not cause stuttering.

RE: Video stuttering after processing - matti157 - 22.10.2024

Setting the resolution to 1440x1080 and removing “Prefer Bestsource” resulted in a perfect video.No stuttering

I had probably exaggerated with the upscale by choosing 1920x1440 first

thanks for the assistance Selur

RE: Video stuttering after processing - Bartoloni - 24.10.2024

upscaling a PAL VHS? why? this need to be done using the player.. BTW
i suffered from these stuttering ALSO... they happens to me on PAL VHS...
seems something related to QTGCM ...
when i have a video recorded with shaky hands and maybed with a zoom, (vertical very fast shakes)
after deinterlacing the clip seems loosing frames on these parts (4-6 frames lost) , well first time happears i post a sample.
BTW nice to ear that someone else has the issue.

RE: Video stuttering after processing - Bartoloni - 24.10.2024

this is a sample of my "stutterings":

http://www.wcn.it/jumps.mp4

the original footage is not stuttering, and on other parts of the video the playback is smooth

iroginal interlaced: http://www.wcn.it/original.avi

no changes using bestsource or not.

RE: Video stuttering after processing - Selur - 25.10.2024

Strange: I see the 'stuttering' already in the source during playback.
=> try whether using AviSource changes anything