How to automatically remove scenes when nothing happens

Question

Hi! I am working a lot with painting footage in which the brush leaves the scene and the clip just shows the painting and nothing happens in the frame. I was wondering if there is an automated tool that can detect frames where nothing happens - no movement - and extract or mark these parts on the clip for me.

Until now I have been editing those manually out and with footage that is up to 12 hours long it takes a really long time. Does any of you know if there's a workaround, tool or extension that can do such thing?

Many thanks in advance!

basil1891 · Accepted Answer

Wow! @basil1891 ! This script is so amazing! It literally works like magic! I am gonna try this now out with some other footage but I wanted to ask you if there is any way for me to put multiple clips on the bat file and see how long it will take them to render? So I could maybe dump 50 files on the bat overnight and then get a info showing me it takes like 5 hours or something? Is this possible?

Glad to hear it worked eventually :).
As to how long it will take, you can only assess it roughly. Assuming all of your videos are of the same resolution, you can remember the speed while processing some typical clip (see attachment), and then just divide total duration in minutes (for all clips in a batch) at that 'speed' value.

basil1891 · Answer

There are some 3rd party tools that is able to remove frame duplicates. While their original intent was not for your case, it may work. Below is a sample of a batch-script configured for removing non-exactly dublicate (but very close to) frames:
1) you put it along with the ffmpeg.exe in some folder
2) create a shortcut to the bat-file on a desktop
3) drop your file on the shortcut
4) after encoding is finished check the folder 'NoStaticScenes'
Later in Premiere you have to change it's FPS to some std value (via interpret footage). This method should work, assuming you don't use audio track from the video in question.

@4628292 off
TITLE %~nx0
SETLOCAL ENABLEEXTENSIONS
set t0=%TIME%, %DATE%

for %%F in (%*) do call :main %%F
goto finalmessage

:main
 SetLocal
  echo -----------------------------------------------------------------------------------
  echo. Processing file: %~f1
  echo.
  set "newdir=NoStaticScenes"
  if not exist "%~dp1\%newdir%" mkdir "%~dp1\%newdir%"

  rem [ cmf: -1=auto, 1=bt709, 6=bt601, 9=bt2020 ]
:: set "cmf=-1"
:: set "bsf=-bsf:v h264_metadata=colour_primaries=%cmf%:transfer_characteristics=%cmf%:matrix_coefficients=%cmf%"

  ffmpeg.exe -y -i "%~f1" -vf mpdecimate=hi=64*30:lo=64*15:frac=0.1 -vsync vfr -pix_fmt yuv420p -c:v libx264 -crf 18 -preset veryfast -x264-params ref=1:bframes=0:keyint=15:min-keyint=1:qcomp=0.7:no-dct-decimate=1 -c:a copy -map 0:v:0 -map 0:a? "%~dp1\%newdir%\%~nx1 [nostats].mov"

 EndLocal
 goto :eof

:finalmessage
powershell write-host -fore cyan  ======================== Processing is FINISHED =========================
echo ----------------------------
echo Batch processing start time: %t0%
echo Batch processing end time:   %TIME%, %DATE%
echo ----------------------------
pause

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