Lossless masking? about lossless-cut HOT 4 CLOSED

It seems that all the masked frames are replaced with what VirtualDub calls D frames or "A drop or null frame, which repeats the previous frame".

Here is the output video of VirtualDub:

1min.zip

Steps to reproduce:

• Download VirtualDub
• Download the QuickTime plugin (and the MKV plugin if you need it).
• Put the extracted plugin files into the plugins64 folder of VirtualDub.
• Download https://download.blender.org/peach/bigbuckbunny_movies/BigBuckBunny_320x180.mp4 (62 MB)
• Open in LosslessCut. Cut from 0 to 1 minute. save as 1min.mp4
• Load 1min.mp4 into VirtualDub. From the toolbar menu, select Video --> Direct stream copy
• Mark from second 5 to second 20 using the buttons at the bottom
• Edit --> Mask selected frames
• Ctrl+D (to clear selection)
• File --> Save as AVI ...
• Close 1min.mp4, open 1min.avi in VirtualDub
• Check frames between second 5 to second 20. All D frames

P.S. Interestingly, the file size of output avi file gets smaller and smaller the longer you make the masked portion, sugesting that it is not full keyframes inserted and the frames are actually dropped.

from lossless-cut.

Hi. I believe this is technically similar to #1268 - I've added your suggestion there, and will close this

from lossless-cut.

Thanks.

I just want to add: I am not sure if the frame is actually repeated during the masked segment or that is just a quirk of the media player (if I jump forward within the masked segment (e.g. to frame 130), the player changes to the first unmasked frame (151) for the duration (130-150) then continues to play normally (151-end)) . So, the issue might not exactly be frame manipulation. Could I ask you to try it in VirtualDub (doesn't work in VirtualDub 2) to be sure how it is done? Thanks.

from lossless-cut.

not sure how to test that. maybe you can do it and then load the video into losslesscut and see if there are many keyframes in a short period of time

from lossless-cut.