Changes between Version 13 and Version 14 of Scaling

Timestamp:

Nov 8, 2020, 11:37:01 AM (6 years ago)

Author:

huupoke12

Comment:

Warn about the Sample Aspect Ratio

Scaling

@@ -3 +3 @@
 {{{
 #!div style="border: 1px solid #e5c7c7; margin: 1em; background-color: #fdd;"
-'''Warning:''' When using `-filter_complex`/`-lavfi`, the default scaling flags are not applied, so the default algorithm is not `bicubic`, but `bilinear`. To achieve the same results for complex filter chains, you have to explicitly set the scaling algorithm via the `flags=bicubic` option. 
+'''Warning:'''
+* When using `-filter_complex`/`-lavfi`, the default scaling flags are not applied, so the default algorithm is not `bicubic`, but `bilinear`. To achieve the same results for complex filter chains, you have to explicitly set the scaling algorithm via the `flags=bicubic` option.
+* In some cases, FFmpeg will set the Sample Aspect Ratio to compensate for the ratio change. You have to manually set the SAR value to 1:1 to make the players display it in the way you want. For example:
+{{{
+ffmpeg -i input.mp4 -vf scale=320:240,setsar=1:1 output.mp4
+}}}
 }}}