5 ms·
Well... you can do that with only ffmpeg. ffmpeg -i zelda_720p.mp4 -vf perspective=60:90:589:147:50:415:582:418 output.mp4 Edit: BTW on your picture it's not
by ux 12y ago
Well... you can do that with only ffmpeg.
ffmpeg -i zelda_720p.mp4 -vf perspective=60:90:589:147:50:415:582:418 output.mp4
Edit: BTW on your picture it's not (50,145) but (50,415) for the bottom left corner.
Edit: if quvi supports still works, you can ffplay "https://www.youtube.com/watch?v=rMXD5DxbXog" https://www.youtube.com/watch?v=rMXD5DxbXog" -vf perspective=60:90:589:147:50:415:582:418
(otherwise something similar should be doable with youtube-dl)
Edit: you can also do better and enable the perspective only in the part where it matters. Typically with something like -vf "perspective=60:90:589:147:50:415:582:418:enable='not(between(t,0,5))'"
- silveira 12y agoWow, impressive, I think I now more about ffmpeg now. And I fixed the (50,415), thanks.
- barrkel 12y agoffmpeg is the ImageMagick of video. (GraphicsMagick is the ImageMagick of pictures, for me. IM has a few more features, but GM is more stable and usually much faster.)
- riffraff 12y agoGraphicsMagick also has fewer dependencies, I imagine because it does less things, but none is something I ever needed. I.e. within macports $ port deps imagemagick Full Name: ImageMagick @6.8.9-8_0 Extract Dependencies: xz Build Dependencies: autoconf, automake, libtool Library Dependencies: bzip2, djvulibre, xz, jbigkit, jpeg, lcms2, libpng, tiff, webp, zlib, fftw-3, freetype, fontconfig, ghostscript, libiconv, libtool, openjpeg, openexr, expat, libxml2, pkgconfig Runtime Dependencies: urw-fonts $ sudo deps graphicsmagick Full Name: GraphicsMagick @1.3.20_0+q8 Extract Dependencies: xz Library Dependencies: libxml2, bzip2, xz, zlib, libpng, tiff, freetype, libiconv, libtool, lcms2, jasper, jpeg
- troels 12y agoCompletely unrelated, but what do you think about vips (http://www.vips.ecs.soton.ac.uk/ http://www.vips.ecs.soton.ac.uk/)? I recently discovered the difference in performance between im and gm and that let me to investigate vips, which is presumably (a lot) faster than both.
- barrkel 12y agoIn principle, it looks promising (in particular, using ORC to compile image manipulation kernels to SIMD), but it is a different thing to im or gm. It's a library and a GUI. The library is slightly too low-level for most things I'd use gm for, but a GUI is too laborious. Perhaps it could be integrated into GM or something similar, and used as a back end for certain operations.
- DaveSapien 12y agoyeah, was going to say something similar, but with a simple openGL program...