diff --git a/libavformat/framecrcenc.c b/libavformat/framecrcenc.c
index 8e66a8daf3..c3890373be 100644
--- a/libavformat/framecrcenc.c
+++ b/libavformat/framecrcenc.c
@@ -39,5 +39,5 @@ AVOutputFormat ff_framecrc_muxer = {
     .audio_codec       = CODEC_ID_PCM_S16LE,
     .video_codec       = CODEC_ID_RAWVIDEO,
     .write_packet      = framecrc_write_packet,
-    .flags             = AVFMT_VARIABLE_FPS,
+    .flags             = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT,
 };