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+--- Thread: Automatically remove "black frames" (/thread-3230.html)
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Automatically remove "black frames" - Bartoloni - 18.05.2023
right now after processing a footage with Hybrid .. i need to use a Linux script (FFMPEG + blackdetect filter) to cut in pieces the clip removing the black frames interruptions (i use a blackmagic intensity PRO that generate BLACK frames when the signal is too much "noised" ) and after that i need to merge all these parts to create an output without any BLACK frame..
is possible to used the "blackdetect" filter or something similar on Hybrid to AUTOMATICALLY remove all black frames from footage? (or maybe <5% black frames)
thank you!
RE: Automatically remove "black frames" - Selur - 18.05.2023
No, Hybrid has no filter which would:
a. remove black frames
and
b. cut the audio to keep the source sync
Cu Selur
RE: Automatically remove "black frames" - Bartoloni - 18.05.2023
thank you Cu Selur
RE: Automatically remove "black frames" - Selur - 18.05.2023
Cu = see you
Selur <- the Name
RE: Automatically remove "black frames" - Selur - 18.05.2023
Can you share a small sample of such a clip (with the black frames)?
I suspect that one could use something like:
def replace_low_luma_frames(clip, threshold):
# Calculate average luma for each frame
luma = core.std.ShufflePlanes(clip, planes=0, colorfamily=vs.GRAY)
avg_luma = core.std.PlaneStats(luma)
# Create a mask of frames with luma below the threshold
low_luma_mask = core.std.Expr(avg_luma, f'x {threshold} <')
# Get frame before for replacement
frame_before = core.std.Trim(clip, 0, clip.num_frames - 1)
# Replace frames with low luma using frame_before
replaced = core.std.MaskedMerge(clip, frame_before, low_luma_mask)
return replaced
clip = replace_low_luma_frames(clip, 30)
)to replace each frame which luma is below 30 (or lower) with the frame before it.
Assuming there are only single black frames in the soure and thus singe duplicates that one could use 'FillDrops' to replace the inserted duplicates with interpolated frames.
Cu Selur
RE: Automatically remove "black frames" - humanoid86 - 19.05.2023
try it - pulldown="telecine" or "interpolation"
+ tune: Grain or PSNR or SSIM
RE: Automatically remove "black frames" - Bartoloni - 27.05.2023
OMG very thank you helping me!
here a small interlaced sample: www.wcn.it/black.avi
i have a lot of old footages with these black frames (generated by the blackmagic intensity pro card) (there are more than 1 black consecutive frames BTW.. in the sample maybe not.. but there are)
here there are a lot of black "zones" : www.wcn.it/black2.avi
RE: Automatically remove "black frames" - Selur - 28.05.2023
Okay, here's what you can do.
- Start Hybrid
- load clip
- set 'Filtering->(De-)Interlace/Telecine->Overwrite input scan type to' to 'top field first'
- optional: enable 'Filtering->(De-)Interlace/Telecine->QTGMC Vapoursynth->Bob'.
- go to 'Filtering->Vapoursynth->Custom->Insert Before' set it to 'FillDrops', enable the text box below it.
- in this custom section you now enter:
If you now look at the Vapoursynth Preview all black frames should be replaced with the last non-black frame.# replace a black frames with last frame that was not black
def ReplaceBlackFrames(clip, thresh=0.1, debug=False):
core = vs.core
if not isinstance(clip, vs.VideoNode):
raise ValueError('This is not a clip')
def selectFunc(n, f):
if f.props['PlaneStatsAverage'] > thresh or n == 0:
if debug:
return core.text.Text(clip=clip,text="Org, avg: "+str(f.props['PlaneStatsAverage']),alignment=8)
return clip
toReplace = n
for i in range(n)[::-1]:
if clip.get_frame(i).props['PlaneStatsAverage'] <= thresh:
continue
# remove current replace with frame before
start = core.std.Trim(clip, first=0, last=n-1)
r = core.std.Trim(clip, first=i, last=i)
end = core.std.Trim(clip, first=n+1)
replaced = start + r + end
break
if debug:
return core.text.Text(clip=replaced,text="Replaced, avg: "+str(f.props['PlaneStatsAverage']),alignment=8)
return replaced
clip = core.std.PlaneStats(clip)
fixed = core.std.FrameEval(clip, selectFunc, prop_src=clip)
return fixed
clip = ReplaceBlackFrames(clip, thresh=0.1, debug=False)
- optional: if there were no multiple black frames in a row, enable 'Filtering->Vapoursynth->Misc->FillDrops', this will then replace the duplicate with an interpolated version.
Cu Selur
RE: Automatically remove "black frames" - Bartoloni - 28.05.2023
OMG!!! very very very thank you!!!
RE: Automatically remove "black frames" - Selur - 29.05.2023
Happy that helped, note that this will only work on clips that do not start with black frames.
Cu Selur