All Questions
7
questions
1
vote
0
answers
648
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
86
votes
8
answers
47k
views
What are the differences of watching a 1080p and a 720p version of the same media on a 720p screen?
Say I have 1280x720 pixels on my screen and the current resolution is set to 1280x720 as well. What are the differences between the 1080p version and the 720p version of the same media? Is it ...
- 3,856
4
votes
1
answer
9k
views
xrandr equivalent for Windows 7?
My old 7" Eee netbook runs Linux. I'm able to run the following command to scale what the display shows from the native/tiny 800x480 to something a little larger:
xrandr --output LVDS1 --scale 1.28x1....
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