Add mpdecimate feature to remove similar frames

[rudolphos]

I have a lot of issues to go through, so in order to make it easier for me to help you, I ask that you please try these things first

• Check out all the menus and keyboard shortcuts. Maybe the feature already exists?
• Try with the newest version from GitHub
• Read the documentation and FAQ, Known issues, Troubleshooting to see if the feature already exists
• See if someone already suggested this under Issues or Discussions

Description

mpdecimate is an ffmpeg feature, which losslessly can remove frames that are the same. This is useful for videos which mostly contain a presentation of still frames.

Sometimes this can cause keyframe issues where resulting video doesn't start and you have to scrub manually further for it to play. I think here can come handy the already existing lossless-cut feature which re-renders some parts of the video to avoid keyframe issues.

This is a small excerpt from the PowerShell script I use:
ffmpeg -i $var.FullName -vf mpdecimate -fps_mode vfr -acodec copy $($path+'\'+$tempName)

[mifi]

Hi. I don't think this is a lossless operation. Meaning that in order to use mpdecimate, you would have to re-encode the video. This means it's not really part of losslesscut's main feature set. As for re-encoding parts of the video to in order to call mpdecimate, I'm not sure exactly what that will solve. Do you have an example reproducible case where mpdecimate would solve a problem?