[HELP] Converting to slow motion

[tomek398]

I use Hybrid to convert normal video (30fps) to its slow motion version (still 30fps)


I do it by first converting 30fps to 120fps using Avisynth->FPS Adjust->Interframe and then converting it back to 30fps but this time with Filtering->Speed Change->Change Speed set to 30. 

Here is example.
Original video: https://youtu.be/kSwWiwy8jK8
Slow motion: https://youtu.be/kHaOdiXXypw

In general it works very well and I'm happy with results however sometimes I get some artefacts around moving objects like those ones around that motorcyclist. I'm aware that it is software conversion and some artefact are inevitable but maybe you can advise me how to reduce them a bit. 

Thanks

[Selur]

What settings are you using with Interframe ? Have you tried FrameRateConverter instead of Interframe? (especially playing with the block sizes might help a bit)
Also remember YouTube always reencodes, so even the 'original' isn't really useful to others trying to help you, or did you really download the clip from youtube and then reencode it with Hybrid and upload it again, so it could be reencoded again?

Cu Selur

[tomek398]

What settings are you using with Interframe ?

Preset: Medium
Tuning: Smooth
Override Algo.: smooth (I don't know what it does)

Have you tried FrameRateConverter instead of Interframe? (especially playing with the block sizes might help a bit)

Not before. Just now. Results are OK, but not better than with Interframe. I have more artefacts on static objects (on the wall and barriers in my video). I need to spend more time with it as there are many setting and no help for most of them.

Also remember YouTube always reencodes, so even the 'original' isn't really useful to others trying to help you, or did you really download the clip from youtube and then reencode it with Hybrid and upload it again, so it could be reencoded again?

The clip I used comes from my camera (phone). I just uploaded both clips to YT to show them on this forum.

Thanks
Tomasz

[Selur]

Would need a download to the original to test myself, but as a general side note I wanted to note that there are also frame interpolation methods when using Vapoursynth (Filtering->Vapoursynth->Other->Frame interpolation) which might also be worth a try.
That said Avisynth currently offers more methods.

Cu Selur

[tomek398]

Would need a download to the original to test myself, but as a general side note I wanted to note that there are also frame interpolation methods when using Vapoursynth (Filtering->Vapoursynth->Other->Frame interpolation) which might also be worth a try.

Thanks. I've just tested Vapoursynth and I think that Interframe gives better results at least for that clip. 

Original is here: https://drive.google.com/open?id=1P8Mzo6...5989mm0_-L

I don't think that I re-compressed it after transferring from my mobile.

[Selur]

Will do some testing over the weekend and report back.
Using: Filtering->Vapoursynth->Othe->Frame Interpolation->MVToolsFPS with 'Target fps 120', 'Blocksize 4' and 'Method FlowFPS' looks better in regard of the artifacts while the bike is in front of the wall, but looks worse when the bike is close.
Found no clear 'winner' for this sofar.
AvisynthOptimizer (see: https://forum.doom9.org/showthread.php?t=175723) might be worth a try. (never used it sofar myself)

Cu Selur