Applying QTGMC to a DV-Codec avi

[Bermuda1]

Hi everyone,

so I just tried using QTGMC in Avisynth+ with a DV-Codec avi, despite this .avi already being deinterlaced. I found the result to be quite good as QTGMC reduced the noise. Does anyone have experience with this? I always thought of QTGMC only being a tool to deinterlace an interlaced video and not a tool to decrease noise. Is there perpahps even a better way to denoise a DV-codec avi? Thanks!

Bermuda1

[jagabo]

QTGMC is often use to reduce noise in progressive video. Especially inter-line twitter from a prior bad deinterlace, oversharpening. Use InputType=(1,2,3), or bad scaling. It also has more traditional noise reduction features for removing grain. An example:

QTGMC(InputType=2, EZDenoise=1.0, DenoiseMC=true) # horizontal edge stabilization and grain reduction

Or

QTGMC(InputType=2).TurnRight().QTGMC(InputType=2).TurnLeft() # horizontal edge stabilization and vertical edge stabilization

[Bermuda1]

QTGMC is often use to reduce noise in progressive video. Especially inter-line twitter from a prior bad deinterlace, oversharpening. Use InputType=(1,2,3), or bad scaling. It also has more traditional noise reduction features for removing grain. An example:

QTGMC(InputType=2, EZDenoise=1.0, DenoiseMC=true) # horizontal edge stabilization and grain reduction

Or

QTGMC(InputType=2).TurnRight().QTGMC(InputType=2).TurnLeft() # horizontal edge stabilization and vertical edge stabilization

I am getting the following error in Avisynth+
"libfftw3f-3.dll or fftw3.dll not found. Please put in PATH or use LoadDll() plugin"

I dont see how that makes sense as both dlls are already in the SysWow64 folder and I even copied the libfftw3f-3.dll file into the system32 folder. I needed them for my QTGMC script.

Before getting that error, I had to get the FFT3DFilter - which also worked fine.

Any idea how to fix this issue? Thanks.

[lollo]

Apply the second option in the error message: "use LoadDll() plugin"

[Bermuda1]

Apply the second option in the error message: "use LoadDll() plugin"

I tried it, not working, same error...

LoadPlugin("C:\Program Files (x86)\AviSynth+\plugins64+\LoadDll64.dll")
LoadDLL("C:\Windows\SysWOW64\libfftw3f-3.dll")
LoadDLL("C:\Windows\SysWOW64\fftw3.dll")
SetFilterMTMode("QTGMC", 2)
AviSource("1997_Weihnachten_Silvester_011.avi")
AssumeTFF()
QTGMC(preset="Slower", InputType=2, EZDenoise=1.0, DenoiseMC=true, EdiThreads=2)
Crop(14,2,-28,-16)
Prefetch(2)

Screenshot of the files in Windows\SysWOW64 attached.

[lollo]

try to remove the needed DLLs in the Windows system directories, download them again, place them elsewhere and use loadDll()

Example:

# plugins directory
plugins_dir="C:\Users\giuse\Documents\VideoSoft\MPEG\AviSynth\extFilters\"

	# FFT3DFilter
loadPlugin(plugins_dir + "FFT3dFilter-v2.6\x86\fft3dfilter.dll")

	# FFTW
loadPlugin(plugins_dir + "LoadDll\LoadDll.dll")
loadDll(plugins_dir + "fftw-3.3.5-dll32\libfftw3f-3.dll")

[Alwyn]

I even copied the libfftw3f-3.dll file into the system32 folder. I needed them for my QTGMC script.

The ones that go into the system32 folder are different to those that go into the syswow64 folder.

Upzip the attachment and put the files where the folders say to. I can vouch for the safety of the zip; Windows may block the download.

In a nutshell, the 32bit versions are 2336KB and must be in the C:\Windows\SysWOW64 folder. The 64bit versions are 2708KB and must be in the C:\Windows\System32 folder ("must" unless you're using LoadDLL).

[Bermuda1]

@lollo @Alwyn
Thanks to both of you. Works now. Will now run the scripts and give it a try.

[lollo]

Excellent! Both methods are ok. When you specify the load in the script you have immediate visibility of what is loaded in term of plugins and version, in case you need/want to change something, without searching/looking/editing in the folders. On the other hand, placing the plugins and the DLLs in the folders avoid you to repeat in each script the load command, but hiding somehow the operations. Both methods have pros and cons, choose whteber you prefere.

[lollo]

BTW, in term of "pure" denoise/degrain of progressive sources there are better options then QTGMC, which is excellent in fixing other issues as jagabo already explained.

[Bermuda1]

BTW, in term of "pure" denoise/degrain of progressive sources there are better options then QTGMC, which is excellent in fixing other issues as jagabo already explained.

For example ?

[lollo]

TemporalDegrain
TemporalDegrain2
MDegrain
MCTemporalDenoise
SMDegrain
KNLMeansCL
NLMeans (spatial denoiser) + MDegrain (temporal denoiser), or in general any combination of prefiltering with a spatial denoiser and then a temporal denoiser (effectiveness strongly depends on the source)
...

[Bermuda1]

QTGMC is often use to reduce noise in progressive video. Especially inter-line twitter from a prior bad deinterlace, oversharpening. Use InputType=(1,2,3), or bad scaling. It also has more traditional noise reduction features for removing grain. An example:

QTGMC(InputType=2, EZDenoise=1.0, DenoiseMC=true) # horizontal edge stabilization and grain reduction

So I tried this. The noise reduction is really great, however, compared to InputType=0 (or just not changing anything), I see two difference which are not great: For one, I only get the original 25fps, which is OK, but 50pfs just looks better on modern TV, and secondly, albeit less noisy now, I start seeing interlacing again (see screenshot comparison attached - look at the glass on the bottom).
Same result using InputType=1.

[jagabo]

Those examples were simply meant as ways QTGMC can be used. Not specifically for your video. InputType 2 and 3 are for progressive frames, no deinterlacing is performed. Single rate deinterlacing is usually for progressive material that was encoded interlaced. If you use it on true interlaced video you lose half the motion smoothness. And yes, there are better filters for general noise reduction than QTGMC. Especially for heavy noise. I wouldn't use EZDenoise values much greater than 1.0 for most material -- you start getting ghosting and smearing artifacts during motion.

[Bermuda1]

Ok, thanks, I will try around a little and use the recommendations by @lollo and see what best suits me