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--- appwiki:ffmpeg [2021/12/08 20:08] – [Common Convertion] ying
+++ appwiki:ffmpeg [2022/12/07 07:21] (current) – [Common Convertion] ying
@@ Line 73: / Line 73: @@
   * image to square size (like convert image to texture size format) <code>
-ffmpeg -i image.jpg -vf "scale=1024:1024:force_original_aspect_ratio=decrease,pad=1024:1024:-1:-1:color=white" tex_image.jpg
+ffmpeg -i image.jpg -vf "scale=1024:1024:force_original_aspect_ratio=decrease,pad=1024:1024:-1:-1:color=white" -q:v 1 tex_image.jpg
 # longest side, so basically original size with padding to square
-ffmpeg -i image.jpg -vf "scale=max(iw\,ih):max(iw\,ih):force_original_aspect_ratio=decrease,pad=max(iw\,ih):max(iw\,ih):-1:-1:color=white" tex_image.jpg
+ffmpeg -i image.jpg -vf "scale=max(iw\,ih):max(iw\,ih):force_original_aspect_ratio=decrease,pad=max(iw\,ih):max(iw\,ih):-1:-1:color=white" -q:v 1 tex_image.jpg
 </code>
+====== GIF related ======
+  * use every 1 from out of 10 frame from a huge frame-by-frame gif recording, and save as a 600px width gif <code dos>
+ffmpeg.exe -i big_recording.gif -vf "select=not(mod(n-1\,10)),scale=600:-1" -vsync vfr light_10th_600w.gif
+</code>