avcodec/mpegvideo_enc: ensure lmin is smaller than lmax

Fixes ticket #10234

Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/ituh263enc.c

@@ -865,6 +865,11 @@ av_cold void ff_h263_encode_init(MpegEncContext *s)
         s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
     }
 
+    if (s->lmin > s->lmax) {
+        av_log(s->avctx, AV_LOG_WARNING, "Clipping lmin value to %d\n", s->lmax);
+        s->lmin = s->lmax;
+    }
+
     ff_thread_once(&init_static_once, h263_encode_init_static);
 }
 

libavcodec/mpegvideo_enc.c

@@ -798,6 +798,11 @@ av_cold int ff_mpv_encode_init(AVCodecContext *avctx)
                                                 AV_CODEC_FLAG_INTERLACED_ME) ||
                                 s->alternate_scan);
 
+    if (s->lmin > s->lmax) {
+        av_log(avctx, AV_LOG_WARNING, "Clipping lmin value to %d\n", s->lmax);
+        s->lmin = s->lmax;
+    }
+
     /* init */
     ff_mpv_idct_init(s);
     if ((ret = ff_mpv_common_init(s)) < 0)