All Questions
5
questions
1
vote
0
answers
663
views
What variant of Spline algorithm is used in "spline" parameter from "scale" filter?
FFmpeg has two filters to scale the video: scale and zscale - zscale has spline16 and spline36 parameters (they represent Spline16 and Spline36 variants of the algorithm), scale has spline parameter.
...
- 343
1
vote
1
answer
1k
views
Downscaling VP9 from 4K to 1080p without re-compression
I have a video file that is a 4K upscale of a 1080p video in VP9 (upscaled to 4K to force Youtube to use higher bitrate for the video).
I want to downscale the 4K video file to 1080p while (...
- 113
1
vote
1
answer
1k
views
FFmpeg - Is it better to scale mosaic videos at the input or the output?
The (batch) script below produces a mosaic of the nine input videos:
FFMPEG ^
-y -i "v1.mp4" -i "v2.mp4" -i "v3.mp4" -i "v4.mp4" -i "v5.mp4" -i "v6.mp4" -i "v7.mp4" -i "v8.mp4" -i "v9.mp4" ^
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- 1,596
4
votes
2
answers
4k
views
How can I scale an overlay within an ffmpeg filtercomplex?
I would like to apply a PNG overlay (watermark) to an arbitrary video file using ffmpeg. I would like the video to stay its original size (which I don't know ahead of time), and the PNG to be scaled ...
- 1,338
5
votes
1
answer
2k
views
Upscaling video with different filter on each side
I need scale up video from one DOS game using FFmpeg. But with Nearest-neighbor interpolation on left side and xBR filter on the other one.
Input (320x200)
Output (1280x800)
Here is a command, ...
- 205