--- /dev/null
+--- a/libavformat/yuv4mpegenc.c
++++ b/libavformat/yuv4mpegenc.c
+@@ -268,7 +268,7 @@
+ 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");