Fix rc_eq mem leak.

Originally committed as revision 14788 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/ratecontrol.c

@@ -106,7 +106,7 @@ int ff_rate_control_init(MpegEncContext *s)
     };
     emms_c();
 
-    rcc->rc_eq_eval = ff_parse(s->avctx->rc_eq, const_names, func1, func1_names, NULL, NULL, &error);
+    rcc->rc_eq_eval = ff_parse(s->avctx->rc_eq ? s->avctx->rc_eq : "tex^qComp", const_names, func1, func1_names, NULL, NULL, &error);
     if (!rcc->rc_eq_eval) {
         av_log(s->avctx, AV_LOG_ERROR, "Error parsing rc_eq \"%s\": %s\n", s->avctx->rc_eq, error? error : "");
         return -1;

libavcodec/utils.c

@@ -762,7 +762,6 @@ void avcodec_get_context_defaults2(AVCodecContext *s, enum CodecType codec_type)
         flags= AV_OPT_FLAG_SUBTITLE_PARAM;
     av_opt_set_defaults2(s, flags, flags);
 
-    s->rc_eq= av_strdup("tex^qComp");
     s->time_base= (AVRational){0,1};
     s->get_buffer= avcodec_default_get_buffer;
     s->release_buffer= avcodec_default_release_buffer;

libavformat/ffmenc.c

@@ -132,7 +132,7 @@ static int ffm_write_header(AVFormatContext *s)
             put_be16(pb, (int) (codec->qcompress * 10000.0));
             put_be16(pb, (int) (codec->qblur * 10000.0));
             put_be32(pb, codec->bit_rate_tolerance);
-            put_strz(pb, codec->rc_eq);
+            put_strz(pb, codec->rc_eq ? codec->rc_eq : "tex^qComp");
             put_be32(pb, codec->rc_max_rate);
             put_be32(pb, codec->rc_min_rate);
             put_be32(pb, codec->rc_buffer_size);