Fix svt-av1 crf > 63 (#347)

Author: alexheretic

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Unreleased (0.11)
 * svt-av1: Support crf quarter steps. Default `--crf-increment` to 0.25 for this encoder.
-  This requires svt-av1 >= v4.0.0, if using an older version you may want to use crf-search with `--crf-increment 1`.
+  This requires svt-av1 >= [v4.0.0](https://gitlab.com/AOMediaCodec/SVT-AV1/-/blob/master/CHANGELOG.md#400---2026-01-13), 
+  if using an older version you may want to use crf-search with `--crf-increment 1`.
 * svt-av1: Widen default crf search range [10, 55] -> [5, 70].
 
 # v0.10.4

src/command/args/encode.rs

@@ -331,7 +331,8 @@ impl Encode {
             vcodec: Arc::clone(vcodec),
             pix_fmt,
             vfilter: self.vfilter.as_deref(),
-            crf,
+            // ffmpeg svt-av1 crf above 63 don't work, but up to 70 does work in -svtav1-params
+            crf: if svtav1 { crf.min(63.0) } else { crf },
             preset,
             output_args: args,
             input_args,