ffv1enc: favor version 3 over 2 unless -strict -2 is set

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/ffv1enc.c

@@ -647,7 +647,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
     if ((avctx->flags & (CODEC_FLAG_PASS1|CODEC_FLAG_PASS2)) || avctx->slices>1)
         s->version = FFMAX(s->version, 2);
 
-    if (avctx->level == 3) {
+    if (avctx->level == 3 || (s->version==2 && avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL)) {
         s->version = 3;
     }