4 ms·

>This filter generates a file with relative translation and rotation transform information about subsequent frames >which is then used by the vidstabtransform

by foxes 7y ago

>This filter generates a file with relative translation and rotation transform information about subsequent frames >which is then used by the vidstabtransform filter. The first pass is meant to find the rotation, then I assume the next pass cancels it out.

mehrdadn 7y ago
Maybe my terminology is wrong, but what I'm talking about is basically what you see with the biker and pen here, or the washing machine at 3:44: https://www.youtube.com/watch?v=I6E6InIQ76Q&t=9s https://www.youtube.com/watch?v=I6E6InIQ76Q&t=9s They stay stable in the center whereas the rest of the frame is transformed. This necessarily requires introducing black/white crop frames into the image with all kinds of shapes and sizes, but it turns out incredibly smooth and doesn't lose any of the frame. It also requires no noticeable blurring at all from what I can tell. But that doesn't seem to be quite what's happening with these commands though.
- jacobush 7y ago
  You can also reuse previous and following frames instead of using solid color borders
- ShamelessC 7y ago
  I believe what you're looking for is what Reddit's popular bot u/stabbot does. I was able to find this comment thread where a user posted some ffmpeg scripts to replicate the behavior. Am on mobile currently so I can't verify they do what you're looking for but here's a snippet. //PART 1 [Defaults: shakiness=5:accuracy=15:stepsize=6:mincontrast=0.3:show=0] ffmpeg -i shaky-input.mp4 -vf vidstabdetect=shakiness=5:accuracy=15:stepsize=6:mincontrast=0.3:show=2 dummy_crop.mp4 //PART 2 ffmpeg -i shaky-input.mp4 -vf scale=trunc((iw0.90)/2)2:trunc(ow/a/2)*2 scaled_crop.mp4 //PART 3 [-strict -2 ONLY IF OPUS AUDIO] - [Unsharp Default: '5:5:1.0:5:5:0.0'] ffmpeg -i scaled_crop.mp4 -vf vidstabtransform=smoothing=20:input="transforms.trf":interpol=no:zoom=-10:optzoom=2,unsharp=5:5:0.8:3:3:0.4 stabilized_crop-output.mp4 https://www.reddit.com/r/stabbot/comments/9f7ayj/comment/e5xd7md https://www.reddit.com/r/stabbot/comments/9f7ayj/comment/e5x...
  - mehrdadn 7y ago
    Yeah that kind of looks like it. Thank you! I'll try it out.
  - sorenjan 7y ago
    Stabbot is open source. It's written in Python and calls out to ffmpeg with vidstabdetect/transform: https://gitlab.com/juergens/stabbot https://gitlab.com/juergens/stabbot I don't think vidstab can do exactly what's being asked for here, I've never seen it rotating the frame completely to keep a rotating pen stabilized, or move the frame inside a larger canvas to keep a moving subject centered. I think you have to use video editing and do that manually.
- ubercow13 7y ago
  Despite the above example apparently applying an actual blur filter, you always might get a bit of blur on videos in general because of the motion blur inherent in the source, which becomes more obvious once the motion is removed. You can't really do much about that except for refilm the video with a shorter shutter speed.

by foxes 7y ago

mehrdadn 7y ago

Maybe my terminology is wrong, but what I'm talking about is basically what you see with the biker and pen here, or the washing machine at 3:44: https://www.youtube.com/watch?v=I6E6InIQ76Q&t=9s https://www.youtube.com/watch?v=I6E6InIQ76Q&t=9s They stay stable in the center whereas the rest of the frame is transformed. This necessarily requires introducing black/white crop frames into the image with all kinds of shapes and sizes, but it turns out incredibly smooth and doesn't lose any of the frame. It also requires no noticeable blurring at all from what I can tell. But that doesn't seem to be quite what's happening with these commands though.

jacobush 7y ago
You can also reuse previous and following frames instead of using solid color borders
ShamelessC 7y ago
I believe what you're looking for is what Reddit's popular bot u/stabbot does. I was able to find this comment thread where a user posted some ffmpeg scripts to replicate the behavior. Am on mobile currently so I can't verify they do what you're looking for but here's a snippet. //PART 1 [Defaults: shakiness=5:accuracy=15:stepsize=6:mincontrast=0.3:show=0] ffmpeg -i shaky-input.mp4 -vf vidstabdetect=shakiness=5:accuracy=15:stepsize=6:mincontrast=0.3:show=2 dummy_crop.mp4 //PART 2 ffmpeg -i shaky-input.mp4 -vf scale=trunc((iw0.90)/2)2:trunc(ow/a/2)*2 scaled_crop.mp4 //PART 3 [-strict -2 ONLY IF OPUS AUDIO] - [Unsharp Default: '5:5:1.0:5:5:0.0'] ffmpeg -i scaled_crop.mp4 -vf vidstabtransform=smoothing=20:input="transforms.trf":interpol=no:zoom=-10:optzoom=2,unsharp=5:5:0.8:3:3:0.4 stabilized_crop-output.mp4 https://www.reddit.com/r/stabbot/comments/9f7ayj/comment/e5xd7md https://www.reddit.com/r/stabbot/comments/9f7ayj/comment/e5x...
- mehrdadn 7y ago
  Yeah that kind of looks like it. Thank you! I'll try it out.
- sorenjan 7y ago
  Stabbot is open source. It's written in Python and calls out to ffmpeg with vidstabdetect/transform: https://gitlab.com/juergens/stabbot https://gitlab.com/juergens/stabbot I don't think vidstab can do exactly what's being asked for here, I've never seen it rotating the frame completely to keep a rotating pen stabilized, or move the frame inside a larger canvas to keep a moving subject centered. I think you have to use video editing and do that manually.
ubercow13 7y ago
Despite the above example apparently applying an actual blur filter, you always might get a bit of blur on videos in general because of the motion blur inherent in the source, which becomes more obvious once the motion is removed. You can't really do much about that except for refilm the video with a shorter shutter speed.