diff --git a/ffmpeg.c b/ffmpeg.c
index 4e8ac200da2432e2db5746c829cd248c5e06d85c..2921a06ddfa5333ee08ae523e5f8cc697c932c90 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -617,6 +617,8 @@ static void choose_sample_fmt(AVStream *st, AVCodec *codec)
                 break;
         }
         if (*p == -1) {
+            if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
+                av_log(NULL, AV_LOG_ERROR, "Convertion will not be lossless'\n");
             av_log(NULL, AV_LOG_WARNING,
                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
                    av_get_sample_fmt_name(st->codec->sample_fmt),