avcodec/mpegvideo_enc: Combine some checks

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/mpegvideo_enc.c

@@ -3520,7 +3520,7 @@ static int encode_picture(MpegEncContext *s, int picture_number)
 
     /* we need to initialize some time vars before we can encode B-frames */
     // RAL: Condition added for MPEG1VIDEO
-    if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO || s->codec_id == AV_CODEC_ID_MPEG2VIDEO || (s->h263_pred && !s->msmpeg4_version))
+    if (s->out_format == FMT_MPEG1 || (s->h263_pred && !s->msmpeg4_version))
         set_frame_distances(s);
     if(CONFIG_MPEG4_ENCODER && s->codec_id == AV_CODEC_ID_MPEG4)
         ff_set_mpeg4_time(s);
@@ -3549,7 +3549,7 @@ static int encode_picture(MpegEncContext *s, int picture_number)
         update_qscale(s);
     }
 
-    if(s->codec_id != AV_CODEC_ID_AMV && s->codec_id != AV_CODEC_ID_MJPEG){
+    if (s->out_format != FMT_MJPEG) {
         if(s->q_chroma_intra_matrix   != s->q_intra_matrix  ) av_freep(&s->q_chroma_intra_matrix);
         if(s->q_chroma_intra_matrix16 != s->q_intra_matrix16) av_freep(&s->q_chroma_intra_matrix16);
         s->q_chroma_intra_matrix   = s->q_intra_matrix;