diff --git a/ffmpeg.c b/ffmpeg.c
index 70f4bfd23a..3154eba85d 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -2197,6 +2197,8 @@ static int transcode(AVFormatContext **output_files,
             }
 
             codec->bit_rate = icodec->bit_rate;
+            codec->rc_max_rate    = icodec->rc_max_rate;
+            codec->rc_buffer_size = icodec->rc_buffer_size;
             codec->extradata= av_mallocz(extra_size);
             if (!codec->extradata)
                 goto fail;