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-rw-r--r--filters/f_autoconvert.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/filters/f_autoconvert.h b/filters/f_autoconvert.h
index ae08fd4e51..7cb144aa59 100644
--- a/filters/f_autoconvert.h
+++ b/filters/f_autoconvert.h
@@ -35,7 +35,7 @@ void mp_autoconvert_set_target_image_params(struct mp_autoconvert *c,
// Each call adds to the list of allowed formats. Before the first call, all
// formats are allowed (even non-video).
// subfmt can be used to specify underlying surface formats for hardware formats,
-// otherwise must be 0.
+// otherwise must be 0. (Mismatches lead to conversion errors.)
void mp_autoconvert_add_imgfmt(struct mp_autoconvert *c, int imgfmt, int subfmt);
// Add all sw image formats. The effect is that hardware video image formats are