--- a/libavformat/yuv4mpegenc.c
+++ b/libavformat/yuv4mpegenc.c
@@ -259,7 +259,7 @@
             av_log(s, AV_LOG_ERROR, "'%s' is not an official yuv4mpegpipe pixel format. "
                    "Use '-strict -1' to encode to this pixel format.\n",
                    av_get_pix_fmt_name(s->streams[0]->codecpar->format));
-            return AVERROR(EINVAL);
+            //return AVERROR(EINVAL);
         }
         av_log(s, AV_LOG_WARNING, "Warning: generating non standard YUV stream. "
                "Mjpegtools will not work.\n");