diff --git a/libswresample/swresample.c b/libswresample/swresample.c
index f2e66005eb..74c96dce60 100644
--- a/libswresample/swresample.c
+++ b/libswresample/swresample.c
@@ -223,6 +223,8 @@ av_cold int swr_init(struct SwrContext *s){
         }else if(   av_get_planar_sample_fmt(s-> in_sample_fmt) == AV_SAMPLE_FMT_S32P
                  && av_get_planar_sample_fmt(s->out_sample_fmt) == AV_SAMPLE_FMT_S32P
                  && !s->rematrix
+                 && s->out_sample_rate == s->in_sample_rate
+                 && !(s->flags & SWR_FLAG_RESAMPLE)
                  && s->engine != SWR_ENGINE_SOXR){
             s->int_sample_fmt= AV_SAMPLE_FMT_S32P;
         }else if(av_get_bytes_per_sample(s->in_sample_fmt) <= 4){